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Updates:
A few days ago we've got the same segfault on production server, but in this case it happened without shut down. I think there is a race when calling process_rpc_req function and it does not relate to server cooldown.
Core dump:
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Reading symbols from /var/lib/ums/sbin/kamailio...done.
[New LWP 6226]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/var/lib/ums/sbin/kamailio -m 2048 -M 12 -P /var/run/kamailio/kamailio.pid -f /'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 __strcmp_sse2_unaligned ()
at ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:32
#0 __strcmp_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:32
#1 0x00007f327f55c2f5 in rpc_mod_print (rpc=0x7f327ee71540 <binrpc_callbacks>, ctx=0x7ffe1418a9b8, mname=0x1dca0c8 "tls", stats=0x1de5310, flag=2) at mod_stats.c:117
#2 0x00007f327f55c0eb in rpc_mod_print_one (rpc=0x7f327ee71540 <binrpc_callbacks>, ctx=0x7ffe1418a9b8, mname=0x1dca0c8 "tls", pkg_stats=0x1de39d0, shm_stats=0x1de5310, flag=2) at mod_stats.c:159
#3 0x00007f327f55bee1 in rpc_mod_mem_stats_mode (rpc=0x7f327ee71540 <binrpc_callbacks>, ctx=0x7ffe1418a9b8, fmode=0) at mod_stats.c:239
#4 0x00007f327f55b84f in rpc_mod_mem_stats (rpc=0x7f327ee71540 <binrpc_callbacks>, ctx=0x7ffe1418a9b8) at mod_stats.c:251
#5 0x00007f327ec40c80 in process_rpc_req (buf=0x1dca0b4 "\241\003\026F\270\067\r\221\nmod.stats", size=29, bytes_needed=0x7ffe1418ae00, sh=0x7ffe1418ad70, saved_state=0x1dda0b8) at binrpc_run.c:678
#6 0x00007f327ec2e72f in handle_stream_read (s_c=0x1dca080, idx=-1) at io_listener.c:511
#7 0x00007f327ec2a121 in handle_io (fm=0x7f3302c66cc0, events=1, idx=-1) at io_listener.c:706
#8 0x00007f327ec2893a in io_wait_loop_epoll (h=0x7f327ee71348 <io_h>, t=10, repeat=0) at ./../../core/io_wait.h:1062
#9 0x00007f327ec1c62c in io_listen_loop (fd_no=2, cs_lst=0x1cde940) at io_listener.c:281
#10 0x00007f327ec5272c in mod_child (rank=0) at ctl.c:338
#11 0x0000000000638c14 in init_mod_child (m=0x7f3302ae54b0, rank=0) at core/sr_module.c:780
#12 0x000000000063862d in init_mod_child (m=0x7f3302ae5b78, rank=0) at core/sr_module.c:776
#13 0x000000000063862d in init_mod_child (m=0x7f3302ae6018, rank=0) at core/sr_module.c:776
#14 0x000000000063862d in init_mod_child (m=0x7f3302ae6528, rank=0) at core/sr_module.c:776
#15 0x000000000063862d in init_mod_child (m=0x7f3302ae69c8, rank=0) at core/sr_module.c:776
#16 0x000000000063862d in init_mod_child (m=0x7f3302ae7140, rank=0) at core/sr_module.c:776
#17 0x000000000063862d in init_mod_child (m=0x7f3302ae77b0, rank=0) at core/sr_module.c:776
#18 0x000000000063862d in init_mod_child (m=0x7f3302ae7c38, rank=0) at core/sr_module.c:776
#19 0x00000000006385b2 in init_child (rank=0) at core/sr_module.c:825
#20 0x000000000043140c in main_loop () at main.c:1753
#21 0x000000000043df6f in main (argc=9, argv=0x7ffe1418f138) at main.c:2802
Logs:
2020-08-18T12:36:03.755718-07:00 hpbx031-1.va /var/lib/ums/sbin/kamailio[6204]: INFO: <script>: sip_call_id=9bf05e23-bdab-4c7e-93fd-975f1d27d3a9@hpbx031-1.va; Received ACK in a dialog
2020-08-18T12:36:03.755756-07:00 hpbx031-1.va /var/lib/ums/sbin/kamailio[6204]: INFO: <script>: sip_call_id=9bf05e23-bdab-4c7e-93fd-975f1d27d3a9@hpbx031-1.va; Relaying ACK from b2bua to sip:54171324@127.0.0.1:5060
2020-08-18T12:36:03.757855-07:00 hpbx031-1.va /var/lib/ums/sbin/kamailio[6197]: INFO: <script>: [75229096,R,0_1478685494]: Received, method: REGISTER, R-URI: sip:hpbx031.telecomsvc.com:5060, ct: sip:75229096@192.168.10.116:5100, cseq: 14166, s-ip: 74.89.64.126, s-port: 5100
2020-08-18T12:37:29.073600-07:00 hpbx031-1.va /var/lib/ums/sbin/kamailio[6193]: INFO: [core/sctp_core.c:53]: sctp_core_destroy(): SCTP API not initialized
2020-08-18T12:37:39.583593-07:00 hpbx031-1.va kamailio: INFO: [core/sctp_core.c:75]: sctp_core_check_support(): SCTP API not enabled - if you want to use it, load sctp module
2020-08-18T12:37:39.780830-07:00 hpbx031-1.va kamailio: INFO: [core/tcp_main.c:5043]: init_tcp(): using epoll_lt as the io watch method (auto detected)
2020-08-18T12:37:39.781363-07:00 hpbx031-1.va kamailio[23718]: loading modules under config path: /var/lib/ums/lib64/kamailio/modules/
2020-08-18T12:37:39.781546-07:00 hpbx031-1.va kamailio[23718]: Listening on
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