2.6.30-rc4: xfs_fsr hangs
felixb at sgi.com
Thu May 7 20:17:49 CDT 2009
On May 7, 2009, at 8:09 PM, Eric Sandeen wrote:
> Felix Blyakher wrote:
>> I've been chasing this as well, and I found the double xfs iolock
>> unlock which is causing xfs_fsr deadlock itself. I have a fix tested.
>> The patch is coming.
> Oh :) I just sent this one to the list ... :)
Oh :) And I did as well.
And guess what, the fix is exactly the same.
Great minds think alike :)
> XFS: Fix double unlock of inodes in xfs_swap_extents()
> commit ef8f7fc549bf345d92f396f5aa7b152b4969cbf7 had an error
> where we would try to re-unlock the inodes after they had been
> committed in the transaction; this double unlock caused a
> [ BUG: bad unlock balance detected! ]
> xfs_fsr/1459 is trying to release lock (&(&ip->i_iolock)->mr_lock) at:
> [<e248dedb>] xfs_iunlock+0x2c/0x92 [xfs]
> but there are no more locks to release!
> Signed-off-by: Eric Sandeen <sandeen at sandeen.net>
> Index: linux-2.6/fs/xfs/xfs_dfrag.c
> --- linux-2.6.orig/fs/xfs/xfs_dfrag.c
> +++ linux-2.6/fs/xfs/xfs_dfrag.c
> @@ -347,13 +347,15 @@ xfs_swap_extents(
> error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
> - xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
> - xfs_iunlock(tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
> return error;
> + xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
> + xfs_iunlock(tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
> + goto out;
> xfs_trans_cancel(tp, 0);
> goto out_unlock;
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