[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 #53 from Mark Johnston <markj@FreeBSD.org> ---
Created attachment 268473
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=268473&action=edit
debugging patch

Could you please try applying the attached patch, and test again with a
non-debug kernel as you did in the latest hang?  It will trigger a panic if a
certain invariant fails.  It seems that enabling invariants-checking more
broadly causes the race to go away, I'm hopeful that the check added in the
patch is sufficient.

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