[Bug 259084] Panic while kill -9 syslogd

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 12 Oct 2021 13:22:28 UTC

--- Comment #2 from Peter Eriksson <pen@lysator.liu.se> ---
It seems the syslogd processes is blocking in the kernel at a "pipe_write":

# egrep syslogd /var/log/sys/15:10/procstat-kk-a.log
 9212 101640 syslogd             -                   mi_switch+0xd4
sleepq_catch_signals+0x403 sleepq_wait_sig+0xf _sleep+0x1de pipe_write+0x583
dofilewrite+0xb0 sys_write+0xc0 amd64_syscall+0x387 fast_syscall_common+0xf8 

Looking at our other servers I notice that syslogd has frozen on more than one
of them causing thousands of defunct processes, and it seems to have happened
at the time of a log rotate. Hmm...

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