refactor subscr_conn and subscr_conn_fsm de-/alloc

Refactor: 1. Glue the gsm_subscriber_connection alloc to the subscr_conn_fsm. 2. Add separate AUTH_CIPH state to the FSM. 3. Use conn->use_count to trigger conn release. 4. Add separate RELEASING state to the FSM. 5. Add rate counters for each of the three Complete Layer 3 types. Details: 1. Glue the gsm_subscriber_connection alloc to the subscr_conn_fsm. Historically, a gsm_subscriber_connection was allocated in libbsc land, and only upon Complete Layer 3 did libmsc add the fsm instance. After splitting openbsc.git into a separate osmo-msc, this is no longer necessary, hence: Closely tie gsm_subscriber_connection allocation to the subscr_conn_fsm instance: talloc the conn as a child of the FSM instance, and discard the conn as soon as the FSM terminates. 2. Add separate AUTH_CIPH state to the FSM. Decoding the Complete Layer 3 message is distinctly separate from waiting for the VLR FSMs to conclude. Use the NEW state as "we don't know if this is a valid message yet", and the AUTH_CIPH state as "evaluating, don't release". A profound effect of this: should we for any odd reason fail to leave the FSM's NEW state, the conn will be released right at the end of msc_compl_l3(), without needing to trigger release in each code path. 3. Use conn->use_count to trigger conn release. Before, the FSM itself would hold a use count on the conn, and hence we would need to ask it whether it is ready to release the conn yet by dispatching events, to achieve a use_count decrement. Instead, unite the FSM instance and conn, and do not hold a use count by the FSM. Hence, trigger an FSM "UNUSED" event only when the use_count reaches zero. As long as use counts are done correctly, the FSM will terminate correctly. These exceptions: - The new AUTH_CIPH state explicitly ignores UNUSED events, since we expect the use count to reach zero while evaluating Authentication and Ciphering. (I experimented with holding a use count by AUTH_CIPH onenter() and releasing by onleave(), but the use count and thus the conn are released before the next state can initiate transactions that would increment the use count again. Same thing for the VLR FSMs holding a use count, they should be done before we advance to the next state. The easiest is to simply expect zero use count during the AUTH_CIPH state.) - A CM Service Request means that even though the MSC would be through with all it wants to do, we shall still wait for a request to follow from the MS. Hence the FSM holds a use count on itself while a CM Service is pending. - While waiting for a Release/Clear Complete, the FSM holds a use count on itself. 4. Add separate RELEASING state to the FSM. If we decide to release for other reasons than a use count reaching zero, we still need to be able to wait for the msc_dtap() use count on the conn to release. (An upcoming patch will further use the RELEASING state to properly wait for Clear Complete / Release Complete messages.) 5. Add rate counters for each of the three Complete Layer 3 types. Besides LU, also count CM Service Request and Paging Response acceptance/rejections. Without these counters, only very few of the auth+ciph outcomes actually show in the counters. Related: OS#3122 Change-Id: I55feb379e176a96a831e105b86202b17a0ffe889
author: Neels Hofmeyr <neels@hofmeyr.de> 2018-03-31 00:02:14 +0200
committer: Harald Welte <laforge@gnumonks.org> 2018-04-11 21:39:44 +0000
commit: e3d3dc6ea218a07161eeb80ae864a96bef2d8e61 (patch)
tree: b0d8bddeda0835e20b4d0592184a4ec2befe7d07 /tests/msc_vlr/msc_vlr_test_authen_reuse.err
parent: dc2514b22062af04354c0331f0f5819051c3fdee (diff)
1 files changed, 540 insertions, 426 deletions
diff --git a/tests/msc_vlr/msc_vlr_test_authen_reuse.err b/tests/msc_vlr/msc_vlr_test_authen_reuse.err
index e96fce8d4..193eb817c 100644
--- a/tests/msc_vlr/msc_vlr_test_authen_reuse.err
+++ b/tests/msc_vlr/msc_vlr_test_authen_reuse.err
@@ -5,12 +5,9 @@ talloc_total_blocks(tall_bsc_ctx) == 12
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 0/23
@@ -31,8 +28,11 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: Received Event VL
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -52,7 +52,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends GSUP LU Req to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -75,8 +75,9 @@ DVLR upd_hlr_vlr_fsm(901700000010650){UPD_HLR_VLR_S_INIT}: Received Event UPD_HL
 DVLR GSUP tx: 04010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST: 04010809710000000156f0
 DVLR upd_hlr_vlr_fsm(901700000010650){UPD_HLR_VLR_S_INIT}: state_chg to UPD_HLR_VLR_S_WAIT_FOR_DATA
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   gsup_tx_confirmed == 1
   lu_result_sent == 0
 - HLR sends _INSERT_DATA_REQUEST, VLR responds with _INSERT_DATA_RESULT
@@ -143,7 +144,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -156,25 +157,28 @@ DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Removing from paren
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   bssap_clear_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -187,13 +191,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -213,13 +214,16 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...autn=8704f5ba55f30000d2ee44b22c8ea919
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -243,22 +247,20 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: proc_arq_f
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
 - sending CM Service Accept for MSISDN:42342
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 2 (0xa)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x8)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_GERAN_A-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -266,22 +268,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_GERAN_A
 - DTAP --RAN_GERAN_A--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   bssap_clear_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -294,13 +299,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and needs to request a second auth vector from HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -317,8 +319,11 @@ DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 0
   gsup_tx_confirmed == 1
@@ -340,7 +345,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 2
   cm_service_result_sent == 0
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -364,22 +369,20 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: proc_arq_f
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
 - sending CM Service Accept for MSISDN:42342
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 2 (0xa)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x8)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_GERAN_A-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -387,22 +390,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_GERAN_A
 - DTAP --RAN_GERAN_A--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   bssap_clear_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -410,6 +416,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
@@ -418,10 +425,19 @@ DMM IMSI DETACH for MSISDN:42342
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
-DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_CN_CLOSE
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Close event, cause 0
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF unknown: MSC conn use + release == 2 (0x101)
 - BSSAP Clear --RAN_GERAN_A--> MS
+DREF unknown: MSC conn use - release == 1 (0x1)
 DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DRLL Freeing subscriber connection with NULL subscriber
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Freeing instance
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Deallocated
   bssap_clear_sent == 1
   llist_count(&net->subscr_conns) == 0
 ===== test_auth_use_twice_geran: SUCCESS
@@ -433,12 +449,9 @@ talloc_total_blocks(tall_bsc_ctx) == 12
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 0/23
@@ -459,8 +472,11 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: Received Event VL
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -480,7 +496,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -499,8 +515,9 @@ DMM -> SECURITY MODE CONTROL IMSI:901700000010650
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -583,7 +600,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -596,25 +613,28 @@ DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Removing from paren
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -627,13 +647,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -653,13 +670,16 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...autn=8704f5ba55f30000d2ee44b22c8ea919
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -679,8 +699,9 @@ DMM -> SECURITY MODE CONTROL MSISDN:42342
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -696,19 +717,19 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: _proc_arq_
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 1 (0x8)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
   cm_service_result_sent == 0
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_UTRAN_IU-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -716,22 +737,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_UTRAN_IU
 - DTAP --RAN_UTRAN_IU--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -744,13 +768,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and needs to request a second auth vector from HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -767,8 +788,11 @@ DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 0
   gsup_tx_confirmed == 1
@@ -790,7 +814,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 2
   cm_service_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -810,8 +834,9 @@ DMM -> SECURITY MODE CONTROL MSISDN:42342
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=1159ec926a50e98c034a6b7d7c9f418d
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -827,19 +852,19 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: _proc_arq_
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 1 (0x8)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
   cm_service_result_sent == 0
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_UTRAN_IU-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -847,22 +872,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_UTRAN_IU
 - DTAP --RAN_UTRAN_IU--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -870,6 +898,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
@@ -878,10 +907,19 @@ DMM IMSI DETACH for MSISDN:42342
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
-DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_CN_CLOSE
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Close event, cause 0
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF unknown: MSC conn use + release == 2 (0x101)
 - Iu Release --RAN_UTRAN_IU--> MS
+DREF unknown: MSC conn use - release == 1 (0x1)
 DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DRLL Freeing subscriber connection with NULL subscriber
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Freeing instance
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Deallocated
   iu_release_sent == 1
   llist_count(&net->subscr_conns) == 0
 ===== test_auth_use_twice_utran: SUCCESS
@@ -893,12 +931,9 @@ talloc_total_blocks(tall_bsc_ctx) == 12
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 0/23
@@ -919,8 +954,11 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: Received Event VL
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -940,7 +978,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends GSUP LU Req to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -963,8 +1001,9 @@ DVLR upd_hlr_vlr_fsm(901700000010650){UPD_HLR_VLR_S_INIT}: Received Event UPD_HL
 DVLR GSUP tx: 04010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST: 04010809710000000156f0
 DVLR upd_hlr_vlr_fsm(901700000010650){UPD_HLR_VLR_S_INIT}: state_chg to UPD_HLR_VLR_S_WAIT_FOR_DATA
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   gsup_tx_confirmed == 1
   lu_result_sent == 0
 - HLR sends _INSERT_DATA_REQUEST, VLR responds with _INSERT_DATA_RESULT
@@ -1031,7 +1070,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -1044,25 +1083,28 @@ DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Removing from paren
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   bssap_clear_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -1075,13 +1117,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -1101,13 +1140,16 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...autn=8704f5ba55f30000d2ee44b22c8ea919
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1131,22 +1173,20 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: proc_arq_f
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
 - sending CM Service Accept for MSISDN:42342
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 2 (0xa)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x8)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_GERAN_A-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -1154,22 +1194,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_GERAN_A
 - DTAP --RAN_GERAN_A--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   bssap_clear_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -1182,13 +1225,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -1208,13 +1248,16 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...autn=8704f5ba55f30000d2ee44b22c8ea919
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1238,22 +1281,20 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: proc_arq_f
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
 - sending CM Service Accept for MSISDN:42342
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 2 (0xa)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x8)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_GERAN_A-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -1261,22 +1302,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_GERAN_A
 - DTAP --RAN_GERAN_A--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   bssap_clear_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -1289,13 +1333,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -1315,13 +1356,16 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...autn=8704f5ba55f30000d2ee44b22c8ea919
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1345,22 +1389,20 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: proc_arq_f
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
 - sending CM Service Accept for MSISDN:42342
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 2 (0xa)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x8)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_GERAN_A-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -1368,22 +1410,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_GERAN_A
 - DTAP --RAN_GERAN_A--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   bssap_clear_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -1391,6 +1436,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
@@ -1399,10 +1445,19 @@ DMM IMSI DETACH for MSISDN:42342
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
-DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_CN_CLOSE
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Close event, cause 0
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF unknown: MSC conn use + release == 2 (0x101)
 - BSSAP Clear --RAN_GERAN_A--> MS
+DREF unknown: MSC conn use - release == 1 (0x1)
 DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DRLL Freeing subscriber connection with NULL subscriber
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Freeing instance
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Deallocated
   bssap_clear_sent == 1
   llist_count(&net->subscr_conns) == 0
 ===== test_auth_use_infinitely_geran: SUCCESS
@@ -1414,12 +1469,9 @@ talloc_total_blocks(tall_bsc_ctx) == 12
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 0/23
@@ -1440,8 +1492,11 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: Received Event VL
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -1461,7 +1516,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1480,8 +1535,9 @@ DMM -> SECURITY MODE CONTROL IMSI:901700000010650
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -1564,7 +1620,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -1577,25 +1633,28 @@ DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Removing from paren
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -1608,13 +1667,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -1634,13 +1690,16 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...autn=8704f5ba55f30000d2ee44b22c8ea919
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1660,8 +1719,9 @@ DMM -> SECURITY MODE CONTROL MSISDN:42342
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -1677,19 +1737,19 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: _proc_arq_
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 1 (0x8)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
   cm_service_result_sent == 0
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_UTRAN_IU-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -1697,22 +1757,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_UTRAN_IU
 - DTAP --RAN_UTRAN_IU--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -1725,13 +1788,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -1751,13 +1811,16 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...autn=8704f5ba55f30000d2ee44b22c8ea919
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1777,8 +1840,9 @@ DMM -> SECURITY MODE CONTROL MSISDN:42342
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -1794,19 +1858,19 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: _proc_arq_
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 1 (0x8)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
   cm_service_result_sent == 0
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_UTRAN_IU-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -1814,22 +1878,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_UTRAN_IU
 - DTAP --RAN_UTRAN_IU--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -1842,13 +1909,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -1868,13 +1932,16 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...autn=8704f5ba55f30000d2ee44b22c8ea919
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1894,8 +1961,9 @@ DMM -> SECURITY MODE CONTROL MSISDN:42342
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -1911,19 +1979,19 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: _proc_arq_
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 1 (0x8)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
   cm_service_result_sent == 0
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_UTRAN_IU-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -1931,22 +1999,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_UTRAN_IU
 - DTAP --RAN_UTRAN_IU--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -1954,6 +2025,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
@@ -1962,10 +2034,19 @@ DMM IMSI DETACH for MSISDN:42342
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
-DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_CN_CLOSE
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Close event, cause 0
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF unknown: MSC conn use + release == 2 (0x101)
 - Iu Release --RAN_UTRAN_IU--> MS
+DREF unknown: MSC conn use - release == 1 (0x1)
 DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DRLL Freeing subscriber connection with NULL subscriber
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Freeing instance
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Deallocated
   iu_release_sent == 1
   llist_count(&net->subscr_conns) == 0
 ===== test_auth_use_infinitely_utran: SUCCESS
@@ -1977,12 +2058,9 @@ talloc_total_blocks(tall_bsc_ctx) == 12
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 0/23
@@ -2003,8 +2081,11 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: Received Event VL
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -2024,7 +2105,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends GSUP LU Req to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -2047,8 +2128,9 @@ DVLR upd_hlr_vlr_fsm(901700000010650){UPD_HLR_VLR_S_INIT}: Received Event UPD_HL
 DVLR GSUP tx: 04010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST: 04010809710000000156f0
 DVLR upd_hlr_vlr_fsm(901700000010650){UPD_HLR_VLR_S_INIT}: state_chg to UPD_HLR_VLR_S_WAIT_FOR_DATA
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   gsup_tx_confirmed == 1
   lu_result_sent == 0
 - HLR sends _INSERT_DATA_REQUEST, VLR responds with _INSERT_DATA_RESULT
@@ -2115,7 +2197,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -2128,25 +2210,28 @@ DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Removing from paren
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   bssap_clear_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -2159,13 +2244,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and needs to request a second auth vector from HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -2182,8 +2264,11 @@ DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 0
   gsup_tx_confirmed == 1
@@ -2205,7 +2290,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 2
   cm_service_result_sent == 0
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -2229,22 +2314,20 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: proc_arq_f
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
 - sending CM Service Accept for MSISDN:42342
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 2 (0xa)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x8)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_GERAN_A-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -2252,22 +2335,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_GERAN_A
 - DTAP --RAN_GERAN_A--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   bssap_clear_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -2275,6 +2361,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
@@ -2283,10 +2370,19 @@ DMM IMSI DETACH for MSISDN:42342
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
-DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_CN_CLOSE
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Close event, cause 0
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF unknown: MSC conn use + release == 2 (0x101)
 - BSSAP Clear --RAN_GERAN_A--> MS
+DREF unknown: MSC conn use - release == 1 (0x1)
 DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DRLL Freeing subscriber connection with NULL subscriber
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Freeing instance
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Deallocated
   bssap_clear_sent == 1
   llist_count(&net->subscr_conns) == 0
 ===== test_no_auth_reuse_geran: SUCCESS
@@ -2298,12 +2394,9 @@ talloc_total_blocks(tall_bsc_ctx) == 12
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 0/23
@@ -2324,8 +2417,11 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: Received Event VL
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -2345,7 +2441,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -2364,8 +2460,9 @@ DMM -> SECURITY MODE CONTROL IMSI:901700000010650
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -2448,7 +2545,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -2461,25 +2558,28 @@ DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Removing from paren
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -2492,13 +2592,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and needs to request a second auth vector from HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -2515,8 +2612,11 @@ DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 0
   gsup_tx_confirmed == 1
@@ -2538,7 +2638,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 2
   cm_service_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -2558,8 +2658,9 @@ DMM -> SECURITY MODE CONTROL MSISDN:42342
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=1159ec926a50e98c034a6b7d7c9f418d
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -2575,19 +2676,19 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: _proc_arq_
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 1 (0x8)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
   cm_service_result_sent == 0
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342
   MSC <--RAN_UTRAN_IU-- MS: NCSS:0x3b
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message NCSS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg NCSS:0x3b: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 1 (0x2)
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
 DMM USSD: Own number requested
@@ -2595,22 +2696,25 @@ DMM MSISDN:42342: MSISDN = 42342
 DMSC msc_tx 43 bytes to MSISDN:42342 via RAN_UTRAN_IU
 - DTAP --RAN_UTRAN_IU--> MS: NCSS:0x2a: 8b2a1c27a225020100302002013b301b04010f0416d9775d0e2ae3e965f73cfd7683d273104d36a3c91a0d
 - DTAP matches expected message
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - all requests serviced, conn has been released
   llist_count(&net->subscr_conns) == 0
@@ -2618,6 +2722,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
@@ -2626,10 +2731,19 @@ DMM IMSI DETACH for MSISDN:42342
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
-DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_CN_CLOSE
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Close event, cause 0
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF unknown: MSC conn use + release == 2 (0x101)
 - Iu Release --RAN_UTRAN_IU--> MS
+DREF unknown: MSC conn use - release == 1 (0x1)
 DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DRLL Freeing subscriber connection with NULL subscriber
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Freeing instance
+DMM Subscr_Conn{SUBSCR_CONN_S_RELEASED}: Deallocated
   iu_release_sent == 1
   llist_count(&net->subscr_conns) == 0
 ===== test_no_auth_reuse_utran: SUCCESS
author	Neels Hofmeyr <neels@hofmeyr.de>	2018-03-31 00:02:14 +0200
committer	Harald Welte <laforge@gnumonks.org>	2018-04-11 21:39:44 +0000
commit	e3d3dc6ea218a07161eeb80ae864a96bef2d8e61 (patch)
tree	b0d8bddeda0835e20b4d0592184a4ec2befe7d07 /tests/msc_vlr/msc_vlr_test_authen_reuse.err
parent	dc2514b22062af04354c0331f0f5819051c3fdee (diff)