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Date:	Wed, 19 Dec 2012 09:53:39 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jens Axboe <axboe@...nel.dk>, Shaohua Li <shli@...ionio.com>,
	Neil Brown <neilb@...e.de>, Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [boot crash] Re: [GIT PULL[ block drivers bits for 3.8

On Wed, Dec 19, 2012 at 8:29 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> I presumably happens on pretty much anything that doesn't have
> discard. Of course, I've personally gotten rid of any rotating devices
> I have, but it still sounds like there's a big testing hole somewhere.

For what it's worth, I have tested Linus's patch on my ARM Chromebook
(which was reproducing the divide by 0 yesterday).  With the patch the
system has no divide by 0 and still boots fine.

Interestingly enough the divide by 0 appeared to happen at probe time
once for each partition of both the internal eMMC and the external SD
card.  Later in the boot sequence the code runs with a non-zero
discard.  I'm not familiar enough with this part of the kernel to
speculate why this system behaves differently than the systems that
Jens tested on.
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