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@xxxxxxxxxx> > > Reported-by: Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx> > > Cc: stable@xxxxxxxxxx > > Thanks Tejun, applied. It's already in mainline: e75aa85892b2ee78c79edac720868cbef16e62eb -- »A man who doesn't know he is in prison can never escape.« William S. Burroughs -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
