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Date: Sat, 27 Sep 2008 13:31:15 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: "John L. Templer" <john_templer@comcast.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: 7.1-PRELEASE sporadically panicking with fatal trap 12
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John L. Templer wrote:
> I'm running 7.1-PRERELEASE, with /usr/src and /usr/ports last csup-ed 
> just a few days ago.  After being up for about a day or so the system 
> will panic because of a page fault.  I'm not completely sure, but it 
> seems that the system is more stable when gdm and gnome are disabled in 
> rc.conf.  At least it stayed up for several days when I did that.
> 
> I've run memtest several times, so I'm pretty confident it's not a 
> memory problem.  Also the stack trace is always the same, so I'm 
> thinking it's not hardware related.
> 
> I've attached a stack trace from kgdb, and the output from dmesg.  I'd 
> appreciate any help you could give me with this.

Please re-send to stable@ and CC sos@.  It looks like a locking problem 
in an error case that you are hitting (note ATA driver message prior to 
panic).

Kris