On Thursday 03 of February 2011, Dave Chinner wrote:
> On Tue, Feb 01, 2011 at 11:00:33AM -0500, Mark Lord wrote:
> > On 11-01-31 11:42 AM, Alex Elder wrote:
> > > Linus, please accept the following updates for XFS, for 2.6.38-rc3
> > > (if it's not too late) or 2.6.38-rc4.
> > >
> > > They are all fixes for bugs that have some pretty undesirable
> > > consequences.
[...]
> > Are these bugs all new in 2.6.38, or should some of these fixes
> > also go out to -stable for earlier revisions?
> > > xfs: fix dquot shaker deadlock
>
> That's a regression, so maybe.
Definitely, xfs_fsr can hit this even few times a day (happened already).
Stable team, please include this one for 2.6.37.1:
commit 0fbca4d1c3932c27c4794bf5c2b5fc961cf5a54f
Author: Dave Chinner <dchinner@xxxxxxxxxx>
Date: Fri Jan 28 11:20:46 2011 +1100
xfs: fix dquot shaker deadlock
Commit 368e136 ("xfs: remove duplicate code from dquot reclaim") fails
to unlock the dquot freelist when the number of loop restarts is
exceeded in xfs_qm_dqreclaim_one(). This causes hangs in memory
reclaim.
Rework the loop control logic into an unwind stack that all the
different cases jump into. This means there is only one set of code
that processes the loop exit criteria, and simplifies the unlocking
of all the items from different points in the loop. It also fixes a
double increment of the restart counter from the qi_dqlist_lock
case.
Reported-by: Malcolm Scott <lkml@xxxxxxxxxxx>
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Alex Elder <aelder@xxxxxxx>
> Cheers,
>
> Dave.
--
Arkadiusz MiÅkiewicz PLD/Linux Team
arekm / maven.pl http://ftp.pld-linux.org/
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