linux-kernel - Re: btrfs zero divide (was: Re: Linux 3.10 problem reports (yes, plural))

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Message-ID: <1375205770.2075.121.camel@joe-AO722>
Date:	Tue, 30 Jul 2013 10:36:10 -0700
From:	Joe Perches <joe@...ches.com>
To:	Josef Bacik <jbacik@...ionio.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Thorsten Glaser <tg@...bsd.de>,
	Debian GNU/Linux m68k <debian-68k@...ts.debian.org>,
	linux-btrfs@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: btrfs zero divide (was: Re: Linux 3.10 problem reports (yes,
 plural))

On Tue, 2013-07-30 at 13:13 -0400, Josef Bacik wrote:
> I've looked at all the places we do divides in this function and it
> doesn't look like we're doing this anywhere but I could be blind,

do_div seems a likely suspect...

	/*
	 * stripe_nr counts the total number of stripes we have to stride
	 * to get to this block
	 */
	do_div(stripe_nr, stripe_len);


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