[Bug 195458] Hang on shutdown/root unmount after FreeBSD 10.1R upgrade

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195458

--- Comment #65 from Glen Barber <gjb at FreeBSD.org> ---
(In reply to Glen Barber from comment #59)
> (In reply to Glen Barber from comment #55)
> > The test machine now has INVARIANTS, INVARIANT_SUPPORT, WITNESS,
> > DEBUG_LOCKS, DEBUG_VFS_LOCKS, DIAGNOSTIC, and ALT_BREAK_TO_DEBUGGER. 
> > Unfortunately, it panics on boot now, so I cannot proceed to the
> > 'freebsd-update install; reboot' phase.
> > [...]
> > It looks like I will need to remove DIAGNOSTIC to get the system to boot.
> 
> It seems removing DIAGNOSTIC alone was not enough, since now the test
> machine panics on boot.

Just a note:

This particular issue (panic-on-boot with DIAGNOSTIC) will need to be
reinvestigated after the original issue discussed in this PR is identified and
resolved, as right now it is difficult to tell if this is an effect of a larger
issue.

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