[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 #64 from Glen Barber <gjb at FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #63)
> (In reply to Glen Barber from comment #62)
> You should add WITNESS_SKIPSPIN kernel option, it is known that console
> spinlocks are not in order.
> 

Okay, I wasn't sure if we wanted to see spinlocks.

> So for the attachment id=154224, is it possible to do show mount and show
> mount <addr> for the root mp ?
> 

Sure.  One thing to note (though it shouldn't matter) is that each iteration
requires a rollback of the VM.  I only mention this in case there is
inconsitencies between ddb sessions.

> You can 'set $lines 0' to disable pager in ddb.

Thank you, I wasn't aware of this.

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