Date: Sat, 14 Jun 2014 17:50:28 +1000 From: Darren Reed <darrenr@freebsd.org> To: freebsd-hackers@freebsd.org Subject: FreeBSD 10.0 adaptive mutex with strange mtx_lock value = panic Message-ID: <539BFEC4.1020103@freebsd.org>
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In debugging a kernel panic running inside a VM, I found the following:
(kgdb) p *$15
$16 = {lock_object = {lo_name = 0xffffffff81a8a224 "filter rule lock",
lo_flags = 16908288, lo_data = 0, lo_witness = 0x0}, mtx_lock = 6}
16908288 = 0x1020000 (CLASS=1|LO_WITNESS)
While everything "looks" normal, mtx_lock = MTX_UNOWNED|MTX_CONTESTED
And kern_mutex.c cannot deal with that.
This is 100% repeatable/reproducible ...
Am I dealing with a VM bug or a FreeBSD bug?
Darren
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