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Date: Tue, 26 Dec 2006 22:47:25 -0500
From: Kris Kennaway <kris@obsecurity.org>
To: Geoffrey Giesemann <geoffwa@cs.rmit.edu.au>
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Cc: stable@freebsd.org
Subject: Re: Background fsck causes kernel panic
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On Wed, Dec 27, 2006 at 09:54:11AM +1100, Geoffrey Giesemann wrote:
> Running a fairly recent RELENG_6 SMP kernel, I had a nasty experience
> where filesystem corruption on a pair of RAID5 volumes on an arcmsr
> would cause the machine to panic during the background fsck.  This
> resulted in a merry crash-reboot-crash cycle until I booted on to an
> install CD, ran a foreground fsck and fixed the errors.

Yes, this is the danger when running bg fsck and your system
experiences a panic or other non-softupdates-safe source of filesystem
corruption.  As you discovered, the solution is to force a fsck to
repair all corruption and then proceed (optionally disabling bg fsck
permanently to prevent a recurrence ;-)

Kris

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