[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 #33 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Craig Leres from comment #32)
> Is this at all interesting?

Not really, it just means that the subsystem which detects lock order
violations ran out of preallocated space.

> Is it possible the deadlock is due to device polling? 

I don't think so.  The vmcore I looked at from you pretty clearly showed that
the idle syncer thread owned a vnode lock, which shouldn't happen.

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