Hello,

the reason of the crash is a double free, but why it happened is not clear -- if you want to avoid crashing on double free, you can set mem_safety=1 .

4.2 is rather old to start digging into its code with a very limited spare time. Maybe you can try with a newer version and see if you can reproduce.

Cheers,
Daniel

Hello,

 

I had a crash on one Kamailio instance with the following backtrace:

 

Core was generated by `/usr/local/sbin/kamailio -m 704 -M 128 -P /run/kamailio/kamailio.pid'.

Program terminated with signal 6, Aborted.

#0  0x00007f92366761f7 in raise () from /lib64/libc.so.6

Missing separate debuginfos, use: debuginfo-install bzip2-libs-1.0.6-13.el7.x86_64 elfutils-libelf-0.168-8.el7.x86_64 glibc-2.17-196.el7_4.2.x86_64 keyutils-libs-1.5.8-3.el7.x86_64 krb5-libs-1.15.1-8.el7.x86_64 libacl-2.2.51-12.el7.x86_64 libattr-2.4.46-12.el7.x86_64 libcap-2.22-9.el7.x86_64 libcom_err-1.42.9-10.el7.x86_64 libdb-5.3.21-21.el7_4.x86_64 libgcc-4.8.5-16.el7_4.1.x86_64 libselinux-2.5-11.el7.x86_64 libstdc++-4.8.5-16.el7_4.1.x86_64 lm_sensors-libs-3.4.0-4.20160601gitf9185e5.el7.x86_64 lua-5.1.4-15.el7.x86_64 mariadb-libs-5.5.56-2.el7.x86_64 net-snmp-agent-libs-5.7.2-28.el7_4.1.x86_64 net-snmp-libs-5.7.2-28.el7_4.1.x86_64 nspr-4.13.1-1.0.el7_3.x86_64 nss-3.28.4-15.el7_4.x86_64 nss-softokn-freebl-3.28.3-8.el7_4.x86_64 nss-util-3.28.4-3.el7.x86_64 openssl-libs-1.0.2k-8.el7.x86_64 pcre-8.32-17.el7.x86_64 perl-libs-5.16.3-292.el7.x86_64 popt-1.13-16.el7.x86_64 rpm-libs-4.11.3-25.el7.x86_64 tcp_wrappers-libs-7.6-77.el7.x86_64 xz-libs-5.2.2-1.el7.x86_64 zlib-1.2.7-17.el7.x86_64

(gdb) backtrace

#0  0x00007f92366761f7 in raise () from /lib64/libc.so.6

#1  0x00007f92366778e8 in abort () from /lib64/libc.so.6

#2  0x000000000061fb2c in qm_free (qm=0x7f91f4eaf000, p=0x7f92110d0300, file=0x7f9226dd7072 "dialog: dlg_hash.c", func=0x7f9226dd9aeb <__FUNCTION__.12761> "destroy_dlg", line=381) at mem/q_malloc.c:474

#3  0x00007f9226d6fb62 in destroy_dlg (dlg=0x7f920f775598) at dlg_hash.c:381

#4  0x00007f9226d75681 in dlg_unref (dlg=0x7f920f775598, cnt=2) at dlg_hash.c:874

#5  0x00007f9226da14d5 in dlg_ontimeout (tl=0x7f920f7755f8) at dlg_handlers.c:1488

#6  0x00007f9226db1e67 in dlg_timer_routine (ticks=8621904, attr=0x0) at dlg_timer.c:283

#7  0x00000000004af537 in compat_old_handler (ti=137950479, tl=0x7f91f7ad8cc8, data=0x7f91f7ad8cc8) at timer.c:1011

#8  0x00000000004aff14 in slow_timer_main () at timer.c:1145

#9  0x000000000052a2af in main_loop () at main.c:1684

#10 0x000000000052fe71 in main (argc=7, argv=0x7fff51f21418) at main.c:2581

(gdb)

 

Is there enough information to understand the reason of the crash?

 

Regards,

 

Igor.

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