[Bug 229614] ZFS lockup in zil_commit_impl

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229614

--- Comment #29 from Andreas Sommer <andreas.sommer87 at googlemail.com> ---
(In reply to Andriy Gapon from comment #28)
Saw that and tried `procstat -kk` on other processes, but as found previously,
it would render the complete system unusable if executed on certain processes.
Didn't find something obvious within the same process (that does
`zil_commit_impl` in one thread). The committing process is Buildbot, and I saw
that it happened during a nightly run of periodic scripts (which go through
whole filesystem).

Now I have to reboot the instance... That's why a non-destructive debugging
method might be more helpful to see what other interlock we have between
processes/threads.

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