[Bug 288345] poudriere run, hanging umounts, system fails to reboot due to hanging processes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288345

--- Comment #34 from Craig Leres <leres@freebsd.org> ---
(In reply to Craig Leres from comment #32)
I saw another case of D wait processes for ~10 minutes, twice today. The timing
was similar to last time: the build started at midnight, the first D wait
happened 48 minutes in, resolved after 10 minutes. The second D wait was at
1:15 and lasted for 9 minutes. I don't see anything interesting in the logs.

I strongly suspect if I had been running the non DEBUG kernel these would have
been system hangs. Looking at DEADLKRES I don't see any printf's that would
indicate that a deadlock was resolved (only panics). Is it possible DEADLKRES
is silently preventing the problematic D wait from happening?

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