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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
To: freebsd-questions@freebsd.org
Date: Fri, 22 May 2009 10:22:56 +0200
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Cc: Shawn Badger <shawnbadger@gmail.com>
Subject: Re: Kernel Panic
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On Friday 22 May 2009 05:30:42 Shawn Badger wrote:
> Hi, I installed FreeBSD 7.2 Release on a mini nettop (Intel
> Atom/945gc/ICH7 hardware), and everything seemed to go smoothly.
> However, when I boot the system and the filesystem checks have been
> going for awhile, it always ends in a panic.  Here's the dump:
>
> dev = ad4s1f, block = 1, fs = /usr
> panic: ffs_blkfree: freeing free block
> cpuid: 1
> uptime: 15m47s
> Physical memory: 2027 MB
> Dumping 180 MB:
>
> Fatal Trap 12: page fault while in kernel mode
> ...
>
> I am using the default filesystem.  Does anyone know what might cause
> this, and how I can fix it?

This will likely go away after booting into single user and running fsck -y. 
See the archives for various discussions about the problems with 
background_fsck.
-- 
Mel