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Neels Hofmeyr gerrit-no-reply at lists.osmocom.orgReview at https://gerrit.osmocom.org/1510 fix segfault: check for NULL tbf in sched_select_ctrl_msg() Apparently fixes a corrupted stack looking like this on sysmobts: (gdb) run Starting program: /usr/bin/osmo-pcu -c /etc/osmocom/osmo-pcu.cfg [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/libthread_db.so.1". <000b> telnet_interface.c:95 telnet at 127.0.0.1 4240 <0001> osmobts_sock.cpp:227 Opening OsmoPCU L1 interface to OsmoBTS <0001> osmobts_sock.cpp:285 osmo-bts PCU socket has been connected <0001> pcu_l1_if.cpp:368 BTS available <0008> gprs_ns.c:233 NSVCI=65534 Creating NS-VC <0008> gprs_ns.c:233 NSVCI=100 Creating NS-VC <0008> gprs_ns.c:1568 NSEI=100 RESET procedure based on API request <0008> gprs_ns.c:393 NSEI=100 Tx NS RESET (NSVCI=100, cause=O&M intervention) <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=2 <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=2 <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=3 <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=3 <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=4 <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=4 <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=5 <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=5 <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=6 <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=6 <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=7 <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=7 <0001> pcu_l1_if.cpp:319 RACH request received: sapi=1 qta=0, ra=120, fn=103198 <0009> tbf_ul.cpp:373 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0x7f2dd569 DIR=UL STATE=FLOW) len=6 <0008> gprs_ns.c:684 All NS-VCs for NSEI 100 are either dead or blocked! Program received signal SIGSEGV, Segmentation fault. gprs_rlcmac_rcv_rts_block (bts=0x60a08, trx=trx at entry=0 '\000', ts=ts at entry=4 '\004', fn=7, fn at entry=103272, block_nr=block_nr at entry=0 '\000') at gprs_rlcmac_sched.cpp:349 349 gprs_rlcmac_sched.cpp: No such file or directory. (gdb) bt #0 gprs_rlcmac_rcv_rts_block (bts=0x60a08, trx=trx at entry=0 '\000', ts=ts at entry=4 '\004', fn=7, fn at entry=103272, block_nr=block_nr at entry=0 '\000') at gprs_rlcmac_sched.cpp:349 #1 0x0001151c in pcu_rx_rts_req_pdtch (trx=<optimized out>, ts=<optimized out>, fn=103272, block_nr=<optimized out>) at pcu_l1_if.cpp:279 #2 0x0000bfcc in handle_ph_readytosend_ind (fl1h=0xafa40, rts_ind=0xb03f8) at osmo-bts-sysmo/sysmo_l1_if.c:142 #3 l1if_handle_l1prim (wq=<optimized out>, fl1h=0xafa40, msg=0xb0330) at osmo-bts-sysmo/sysmo_l1_if.c:259 #4 0x4fcd6330 in osmo_fd_disp_fds (_eset=0xbefffb68, _wset=0xbefffae8, _rset=0xbefffa68) at select.c:149 #5 osmo_select_main (polling=<optimized out>) at select.c:189 #6 0x0000b2a0 in main (argc=<optimized out>, argv=0x66628 <_ZStL8__ioinit>) at pcu_main.cpp:295 Change-Id: I357492e558e98cfdbf5bb3438b5013029195b02b Related: https://lists.osmocom.org/pipermail/osmocom-net-gprs/2016-December/000785.html --- M src/gprs_rlcmac_sched.cpp 1 file changed, 3 insertions(+), 0 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmo-pcu refs/changes/10/1510/1 diff --git a/src/gprs_rlcmac_sched.cpp b/src/gprs_rlcmac_sched.cpp index fdda79d..8b27cac 100644 --- a/src/gprs_rlcmac_sched.cpp +++ b/src/gprs_rlcmac_sched.cpp @@ -173,6 +173,9 @@ } } + if (!tbf) + return NULL; + /* any message */ if (msg) { tbf->rotate_in_list(); -- To view, visit https://gerrit.osmocom.org/1510 To unsubscribe, visit https://gerrit.osmocom.org/settings Gerrit-MessageType: newchange Gerrit-Change-Id: I357492e558e98cfdbf5bb3438b5013029195b02b Gerrit-PatchSet: 1 Gerrit-Project: osmo-pcu Gerrit-Branch: master Gerrit-Owner: Neels Hofmeyr <nhofmeyr at sysmocom.de>