lockmgr panic on shutdown

[Doug White]

I can confirm the lockmgr panic on shutdown reported by someone else
earlier (whose message I mistakenly deleted).

It looks like swapper is trying to undo a lock from pagedaemon and runs
into trouble. This is probably related to the Giant pushdown of
vm_pageout() that alc did last week.

I'm building with INVARIANTS to see if that will catch more info.  Will
report back soon.

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org