[Bug 235513] panic: dead bo 0xfffff8000a838b48

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235513

Jason A. Harmening <jah at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jah at FreeBSD.org
           Assignee|bugs at FreeBSD.org            |jah at FreeBSD.org

--- Comment #3 from Jason A. Harmening <jah at FreeBSD.org> ---
It looks like we already claim to support forcible devfs unmount, mostly for
jails it seems.  This particular panic is from a longstanding KASSERT, so at
least the case of INVARIANTS + devfs forced unmount hasn't been well tested.
I'll poke at this and see if I can tease out some useful fix.  Probably not,
given the foot-shooting nature of the problem, but at least I might learn
something about the buffer cache.

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