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From: John Baldwin <jhb@freebsd.org>
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Cc: Attilio Rao <attilio@freebsd.org>, barbara <barbara.xxx1975@libero.it>,
	"dan.naumov" <dan.naumov@gmail.com>, "C. C. Tang" <hiyorin@gmail.com>
Subject: Re: 7.2-release/amd64: panic, spin lock held too long
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On Wednesday 22 July 2009 12:30:47 pm Attilio Rao wrote:
> 2009/7/22 C. C. Tang <hiyorin@gmail.com>:
> >> Could that one (on i386) be related?
> >> http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/134584
> >>
> >
> > I have no idea about it but I can tell the difference...
> > My machine panic randomly rather than on shutdown and I remembered that it
> > failed to write core dump. It also failed to reboot automatically..
> 
> Is your problem on -CURRENT and amd64?
> At some point there has been a problem with PAT support (and
> tlb_shootdowns() could lead to a livelock hanging forever, leading to
> such a bug) but I expect it is fixed now.

That only happens in a test kernel module and not in stock FreeBSD (and no, it 
is not yet fixed).

-- 
John Baldwin