On Thursday 03 of February 2011, Dave Chinner wrote:

On Tue, Feb 01, 2011 at 11:00:33AM -0500, Mark Lord wrote:

quoted

On 11-01-31 11:42 AM, Alex Elder wrote:

quoted

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. 

[...]

quoted

Are these bugs all new in 2.6.38, or should some of these fixes
also go out to -stable for earlier revisions?

quoted

      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 [off-list ref]
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 [off-list ref]
    Signed-off-by: Dave Chinner [off-list ref]
    Reviewed-by: Alex Elder [off-list ref]

Cheers,

Dave.

-- 
Arkadiusz Miśkiewicz        PLD/Linux Team
arekm / maven.pl            http://ftp.pld-linux.org/

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