From owner-freebsd-geom@FreeBSD.ORG  Thu Oct 13 05:00:17 2005
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Date: Wed, 12 Oct 2005 23:00:16 -0600
From: Chris Jones <cdjones-freebsd-geom@novusordo.net>
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To: Joshua Bell <josh@oplink.net>
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Cc: freebsd-geom@freebsd.org
Subject: Re: GEOM causes kernel panic
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Joshua Bell wrote:

>From this state, if I do anything like `gvinum start` it panics and reboots.  If I am at console, I can see an errors, but unable to 'catch' all of it.
>  
>

I think your best bet is going to be trying to trap memory dumps prior 
to reboot and seeing if you can get any data out of that.  See the 
Developer's Handbook, ch. 10 
(http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html) 
for details.  You may also be able to get a copy of some of the errors 
printed to the console by SSHing in from another machine and doing a 
'tail -f /var/log/console.log'.

Cheers,

Chris