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Date:	Thu, 25 Oct 2012 20:43:26 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Ric Wheeler <ricwheeler@...il.com>
Cc:	Eric Sandeen <sandeen@...hat.com>, linux-kernel@...r.kernel.org,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Bryan Schumaker <bjschuma@...app.com>
Subject: Re: Apparent serious progressive ext4 data corruption bug in 3.6.3
 (and other stable branches?)

On Thu, Oct 25, 2012 at 08:11:12PM -0400, Ric Wheeler wrote:
> 
> Sending this just to you two to avoid embarrassing myself if I
> misread the thread, but....
> 
> Can we reproduce this with any other hardware RAID card? Or with MD?

There was another user who reported very similar corruption using
3.6.2 using USB thumb drive.  I can't be certain that it's the same
bug that's being triggered, but the symptoms were identical.

> If we cannot reproduce this in other machines, why assume this is an
> ext4 issue and not a hardware firmware bug?
> 
> As an ex-storage guy, this really smells like the hardware raid card
> might be misleading us....

It's possible.  The main reason why I took this so seriously was
because of the 2nd, apparently confirming report, with very different
hardware.  That was what was so scary to me, at least at first.

	   	    	     	      - Ted
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