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From: Markus Trippelsdorf on 5 Aug 2010 05:20
On Thu, Aug 05, 2010 at 11:02:43AM +0200, Jens Axboe wrote:
> On 2010-08-04 17:59, Tejun Heo wrote:
> > bd_prepare_to_claim() incorrectly allowed multiple attempts for
> > exclusive open to progress in parallel if the attempting holders are
> > identical. This triggered BUG_ON() as reported in the following bug.
> >
> > https://bugzilla.kernel.org/show_bug.cgi?id=16393
> >
> > __bd_abort_claiming() is used to finish claiming blocks and doesn't
> > work if multiple openers are inside a claiming block. Allowing
> > multiple parallel open attempts to continue doesn't gain anything as
> > those are serialized down in the call chain anyway. Fix it by always
> > allowing only single open attempt in a claiming block.
> >
> > This problem can easily be reproduced by adding a delay after
> > bd_prepare_to_claim() and attempting to mount two partitions of a
> > disk.
> >
> > stable: only applicable to v2.6.35
> >
> > Signed-off-by: Tejun Heo <tj(a)kernel.org>
> > Reported-by: Markus Trippelsdorf <markus(a)trippelsdorf.de>
> > Cc: stable(a)kernel.org
>
> Thanks Tejun, applied.

It's already in mainline:
e75aa85892b2ee78c79edac720868cbef16e62eb

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