[sr-dev] [kamailio/kamailio] Random segfault or general protection crash on siptrace.so module (#2718)

[jimdss]

Hi @miconda We have 2 instances of this crash from two different servers. If it helps I'm attaching the 2 backtraces. At the time of the crash we had the following.

`# ----- siptrace params -----
modparam("siptrace", "duplicate_uri","sip:REDACTED:9060")
modparam("siptrace", "hep_mode_on",1)
modparam("siptrace", "hep_version", 2)
modparam("siptrace", "hep_capture_id", 11)
modparam("siptrace", "trace_to_database",0)
modparam("siptrace", "trace_flag",22)
modparam("siptrace", "trace_on", 1)

...

sip_trace("", "", "d");
`

And the syslog looked like this.

`Jul  1 11:37:21 REDACTED kernel: [19379376.973389] kamailio[20796]: segfault at c0c0c110 ip 00007fb91985c3b7 sp 00007ffc3a691cd0 error 4 in siptrace.so[7fb919831000+4e000]
Jul  1 11:37:21 REDACTED /usr/local/sbin/kamailio[20697]: ALERT: <core> [main.c:788]: handle_sigs(): child process 20796 exited by a signal 11
Jul  1 11:37:21 REDACTED /usr/local/sbin/kamailio[20697]: ALERT: <core> [main.c:791]: handle_sigs(): core was generated
Jul  1 11:37:21 REDACTED /usr/local/sbin/kamailio[20697]: INFO: <core> [main.c:813]: handle_sigs(): terminating due to SIGCHLD`

Hopefully that is helpful. I'm also happy to provide any other info if needed. Thanks! 

[kamailio-bt-5-5-1-ServerA.txt](https://github.com/kamailio/kamailio/files/6748649/kamailio-bt-5-5-1-ServerA.txt)
[kamailio-bt-5-5-1-ServerB.txt](https://github.com/kamailio/kamailio/files/6748650/kamailio-bt-5-5-1-ServerB.txt)


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