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Date: Thu, 24 Jul 2008 00:49:28 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Kevin Shanahan <kmshanah@disenchant.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: libata timeout, MCE and kernel panic
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> recovery was required. It seems the journal recovery combined with the
> md device reconstruction was enough to cause an ata command
> timeout. After that I saw several MCEs and the kernel paniced.

An MCE is amachine check, and indicates the hardware detected a problem.
Given the sequence of heavy I/O, followed by a timeout and the processors
detecting inconsistencies - is your PSU sufficient ?