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| author | Pau Espin Pedrol <pespin@sysmocom.de> | 2018-07-09 20:44:17 +0200 |
|---|---|---|
| committer | Pau Espin Pedrol <pespin@sysmocom.de> | 2018-07-13 11:51:52 +0200 |
| commit | 8c7d2590611eba7a0c0a8e27cc9c4cbf1b5a6067 (patch) | |
| tree | 74a119a443dc57bd81a0eb40c15c95512da2e4e5 /include | |
| parent | fa1201004f85b6e44d746d6044d5a43d04634fa4 (diff) | |
Disarm T3395 when dettaching mmctx from pdpctx
In sgsn_pdp_ctx_terminate, a pdp ctx is terminated and the mm ctx is
detached. However, T3395 may still be armed and then pdpctx_timer_cb
will trigger, and attempt to use the pdp->mm ctx which was already
detached (set to NULL) when calling
gsm48_tx_gsm_deact_pdp_req()->mmctx2msgid().
Following list of log lines shows the scenario+crash, in which osmo-sgsn
is trying to deactivate the ctx all the time but the PCU doesn't ACK it,
and then at some point the PDP context is forced released.
osmo-sgsn/src/gprs/gprs_gmm.c:2294 MM(901700000015254/d7e9ab95) <- DEACTIVATE PDP CONTEXT REQ
osmo-sgsn/src/gprs/gprs_gmm.c:1464 MM(901700000015254/d7e9ab95) -> GMM DETACH REQUEST TLLI=0xd7e9ab95 type=GPRS detach Power-off
osmo-sgsn/src/gprs/gprs_gmm.c:313 MM(901700000015254/d7e9ab95) Cleaning MM context due to GPRS DETACH REQUEST
osmo-sgsn/src/gprs/gprs_sgsn.c:332 MM(901700000015254/d7e9ab95) Dropping PDP context for NSAPI=5
osmo-sgsn/src/gprs/gprs_sgsn.c:434 PDP(901700000015254/0) Forcing release of PDP context
osmo-sgsn/src/gprs/gprs_sndcp.c:508 SNSM-DEACTIVATE.ind (lle=0x62100001bca0, TLLI=d7e9ab95, SAPI=3, NSAPI=5)
osmo-sgsn/src/gprs/sgsn_libgtp.c:310 PDP(---/0) Delete PDP Context
osmo-sgsn/src/gprs/gprs_gmm.c:2294 MM(---/ffffffff) <- DEACTIVATE PDP CONTEXT REQ
osmo-sgsn/src/gprs/gprs_gmm.c:305:25: runtime error: member access within null pointer of type 'const struct sgsn_mm_ctx'
Program received signal SIGSEGV, Segmentation fault.
0x0000555555698c1b in mmctx2msgid (msg=0x61d0000172e0, mm=0x0)
at /home/pespin/dev/sysmocom/git/osmo-sgsn/src/gprs/gprs_gmm.c:305
305 msgb_tlli(msg) = mm->gb.tlli;
(gdb) bt
#0 0x0000555555698c1b in mmctx2msgid (msg=0x61d0000172e0, mm=0x0)
at osmo-sgsn/src/gprs/gprs_gmm.c:305
#1 0x00005555556b170a in _gsm48_tx_gsm_deact_pdp_req (mm=0x0, tid=0 '\000',
sm_cause=38 '&')
at osmo-sgsn/src/gprs/gprs_gmm.c:2297
#2 0x00005555556b1a2e in gsm48_tx_gsm_deact_pdp_req (pdp=0x6140000008a0,
sm_cause=38 '&')
at osmo-sgsn/src/gprs/gprs_gmm.c:2311
#3 0x00005555556b876c in pdpctx_timer_cb (_pdp=0x6140000008a0)
at osmo-sgsn/src/gprs/gprs_gmm.c:2717
#4 0x00007ffff355eb3e in osmo_timers_update ()
at libosmocore/src/timer.c:257
#5 0x00007ffff356255c in osmo_select_main (polling=0)
at libosmocore/src/select.c:254
#6 0x00005555556f17cb in main (argc=3, argv=0x7fffffffe298)
at osmo-sgsn/src/gprs/sgsn_main.c:531
Change-Id: I2120e53ade6cabad37f9bd99e6680a453411821b
Diffstat (limited to 'include')
| -rw-r--r-- | include/osmocom/sgsn/gprs_gmm.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/osmocom/sgsn/gprs_gmm.h b/include/osmocom/sgsn/gprs_gmm.h index 3c93efcb8..28c96ce67 100644 --- a/include/osmocom/sgsn/gprs_gmm.h +++ b/include/osmocom/sgsn/gprs_gmm.h @@ -43,4 +43,6 @@ int gsm48_tx_gmm_att_ack(struct sgsn_mm_ctx *mm); /* TODO: move extract_subscr_* when gsm48_gmm_authorize() got removed */ void extract_subscr_msisdn(struct sgsn_mm_ctx *ctx); void extract_subscr_hlr(struct sgsn_mm_ctx *ctx); + +void pdp_ctx_detach_mm_ctx(struct sgsn_pdp_ctx *pdp); #endif /* _GPRS_GMM_H */ |