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From: Doug Hardie <bc979@lafn.org>
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Subject: Signal 6
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Date: Fri, 29 Jun 2018 08:40:17 -0700
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I have a daemon process that runs forever (almost).  Something is =
killing it with a signal 6, but no core dump is done.  If I manually =
kill it with kill -6, then the log message shows core dumped and a core =
file is created.  The process has no reference to SIG_ABRT, so I suspect =
the kernel is doing the kill and is overriding the core dump.  I have =
previously encountered a similar issue where swap space was running out =
and the kernel killed this process without a core dump.  In that case =
there were quite a few messages logged about swap space issues before =
the process was killed.  There are no swap messages logged this time.

/etc/sysctl.conf contains:
kern.sugid_coredump=3D1
kern.corefile=3D/crash/%N.core

/crash is a directory in the root file system.

Other than swap issues, when would the kernel kill a process without a =
core dump?

-- Doug