The following PID (1083) is an example:
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[Wed Sep 29 11:13:05.225943 2021] [mpm_event:debug] [pid 1083:tid 140042582447872] event.c(2094): AH02471: start_threads: Using epoll
[Wed Sep 29 13:51:55.918160 2021] [core:notice] [pid 1304:tid 140042880669568] AH00051: child pid 1083 exit signal Segmentation fault (11), possible coredump in /etc/apache2
Here's also an example from a PID that died in 4 minutes:
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[Tue Sep 28 14:45:04.026821 2021] [mpm_event:debug] [pid 21198:tid 140193719068416] event.c(2094): AH02471: start_threads: Using epoll
[Tue Sep 28 15:49:11.123843 2021] [core:notice] [pid 19763:tid 140194017290112] AH00051: child pid 21198 exit signal Segmentation fault (11), possible coredump in /etc/apache2
Using one crash file to extract the core dump, I got the following:
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GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
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Reading symbols from /usr/sbin/apache2...(no debugging symbols found)...done.
warning: core file may not match specified executable file.
[New LWP 11748]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/sbin/apache2 -k start'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f816a30b1dd in modperl_handler_resolve () from /usr/lib/apache2/modules/mod_perl.so
(gdb)
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Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f816a30b1dd in modperl_handler_resolve () from /usr/lib/apache2/modules/mod_perl.so
- Server: Ubuntu xenial (16.04)
OTRS: 6.0.34
Apache: 2.4.18-2ubuntu3.17
perl: 5.22.1-9ubuntu0.9
libapache2-mod-perl2: 2.0.9-4ubuntu1.2
Thanks in advance