From owner-freebsd-stable@FreeBSD.ORG  Wed Jan 21 07:13:41 2009
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Date: Wed, 21 Jan 2009 20:13:32 +1300
From: Mark Kirkwood <markir@paradise.net.nz>
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References: <20090109171857.GA49752@marvin.eastcentral.edu>
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Cc: rizzo@iet.unipi.it
Subject: Re: Broken loader on 7.1-STABLE?
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I wrote:
>  
> I am getting this too - update from RELENG_7 @12 Jan src to 20 Jan and 
> I have:
>
> panic: free: guard1 fail @ 0x511d
> from /usr/src/sys/boot/i386/loader/../../common/module.c:959
>
> Can't work out which disk we are booting from.
> Guessed BIOS device 0xffffffff not found by probes, defaulting to disk0
>
>

Forgot to say (cc'ing Luigi as he is collecting info):

Asus a8vx with an AMD 64x2 3800+ dual core