[Bug 210315] panic: destroying non-empty racct: 2113536 allocated for resource 4

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210315

--- Comment #6 from Andriy Gapon <avg at FreeBSD.org> ---
Disabling the checks would, of course, make the symptoms disappear.
But I still wonder what causes the problem(s).

In Larry's case it's especially strange, because starting with
racct_set_locked() all calculations are done under the lock.  So, how can it be
possible that we end up with any value other than zero in
racct_adjust_resource()?
Essentially we do:
delta = 0 - value;
value = value + delta;

It would be interesting to examine the coredump with kgdb.
maybe it would give some clues about how the impossible became possible.

FWIW, I was not able to find any write access to r_resources that was not
protected by racct_lock.

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