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Date:	Wed, 19 Dec 2012 09:53:39 -0800
From:	Doug Anderson <>
To:	Linus Torvalds <>
Cc:	Jens Axboe <>, Shaohua Li <>,
	Neil Brown <>, Ingo Molnar <>,
	"" <>,
	Andrew Morton <>
Subject: Re: [boot crash] Re: [GIT PULL[ block drivers bits for 3.8

On Wed, Dec 19, 2012 at 8:29 AM, Linus Torvalds
<> 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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