[Bug 283747] kernel panic after telegraf service restart

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283747

--- Comment #26 from Gleb Smirnoff <glebius@FreeBSD.org> ---
Got another advice from Allan to force sync on a ZFS dataset:

# zfs set sync=always $dataset

But this all makes sense after we make sure that the process exits.  Cause
if it does not, then the ktrace system itself may keep tracing in buffers
for some time.

Also, I would second on Mark's suggestion to try GENERIC-DEBUG kernel from
14.2-RELEASE, or to compile kernel with 'options INVARIANTS' on the existing
installation.  Cause we are trying to lock a destroyed mutex it could that
with INVARIANTS we will crash earlier, and that earlier crash will give more
insight on the problem.

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