From owner-freebsd-current@FreeBSD.ORG  Thu Jun 26 14:13:44 2008
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Date: Thu, 26 Jun 2008 17:59:56 +0400
From: Eygene Ryabinkin <rea-fbsd@codelabs.ru>
To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
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Cc: Poul-Henning Kamp <phk@phk.freebsd.dk>,
	Pawel Jakub Dawidek <pjd@freebsd.org>,
	FreeBSD current mailing list <current@freebsd.org>
Subject: Re: panic in geom (spindown + eil + journal)
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Bjoern, good day.

Thu, Jun 26, 2008 at 12:26:42PM +0000, Bjoern A. Zeeb wrote:
> I guess some pointer artimetic or anything went wrong here for some
> reason. ad0 is a simple hdd with a few slices with different, mostly
> FreeBSD, installations. ad8 has, as seen above, eli on the disk and
> one standard gjournaled UFS on top of that.

May be provider's geom data was trashed in some way.

> Is there any information I could try to find out to find that bug.
> I had done the same thing hundreds of times before, the only new thing
> from yesterday on was the spindown on 2 of 3 disks.

Any chances to compile debug kernel with KDB/DDB

  http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-online-ddb.html

and when system will panic and debugger will be invoked, issue
commands 'p *(bp->bio_offset)' and 'p *(cp->provider)' at the stack
frame corresponding to the function g_io_request?
-- 
Eygene