Run a basic parse of any core files locally and get a backtrace and find the thread that died with the segfault. It is typically the thread that has <signal handler called> in it, with a subsequent kill(). For example:
gdb -c core.8429 /usr/sbin/httpd.worker ... (gdb) thread 27 [Switching to thread 27 (Thread 10053)]#0 0x00002b93d7ed16a7 in kill () from /lib64/l...
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