----- Original Message -----
> From: "Dave Chinner" <david@xxxxxxxxxxxxx>
> To: "CAI Qian" <caiqian@xxxxxxxxxx>
> Cc: xfs@xxxxxxxxxxx
> Sent: Wednesday, March 13, 2013 12:43:07 PM
> Subject: Re: 3.9-rc2 xfs panic
> On Tue, Mar 12, 2013 at 10:44:36PM -0400, CAI Qian wrote:
> > Eek, got another NULL pointer on an x64 system also. Looks like
> > from
> > xfstests case 110. Same user-space version as the one in the ppc64
> > case. Still trying to reproduce and without more debugging options
> > enabled if possible.
> > Swap Size = 7983 MB
> > Mem Size = 7852 MB
> > Number of Processors = 16
> > meta-data=/dev/loop0 isize=256 agcount=4,
> > agsize=655360 blks
> > = sectsz=512 attr=2, projid32bit=0
> > data = bsize=2048 blocks=2621440,
> > imaxpct=25
> > = sunit=0 swidth=0 blks
> > naming =version 2 bsize=4096 ascii-ci=0
> > log =internal log bsize=2048 blocks=5120,
> > version=2
> > = sectsz=512 sunit=0 blks,
> > lazy-count=1
> > realtime =none extsz=4096 blocks=0, rtextents=0
> > CAI Qian
> > [30706.240701] XFS (loop1): xfs_trans_ail_delete_bulk: attempting
> > to delete a log item that is not in the AIL
> What happens prior to this message? This is the first indication of
> a problem....
Something might be interesting before those were,
[30409.026043] XFS (loop1): xfs_log_force: error 5 returned.
[30409.027253] XFS (loop1): xfs_log_force: error 5 returned.
[30409.028900] XFS (loop1): xfs_log_force: error 5 returned.
[30453.156830] XFS (loop1): Quotacheck: Done.
[30454.006227] XFS (loop1): xfs_log_force: error 5 returned.
[30454.010698] XFS (loop1): xfs_log_force: error 5 returned.
[30454.011673] XFS (loop1): xfs_qm_dquot_logitem_push: push error 5 on dqp
[30454.019251] XFS (loop1): xfs_log_force: error 5 returned.
> > [30706.242124] XFS (loop1): xfs_do_force_shutdown(0x2) called from
> > line 743 of file fs/xfs/xfs_trans_ail.c. Return address =
> > 0xffffffffa03c03ef
> > [30706.245280] XFS (loop1): Log I/O Error Detected. Shutting down
> > filesystem
> > [30706.246311] XFS (loop1): Please umount the filesystem and
> > rectify the problem(s)
> > [30707.279880] XFS (loop0): Mounting Filesystem
> > [30707.290512] XFS (loop0): Ending clean mount
> > [30708.966751] XFS (loop1): xfs_log_force: error 5 returned.
> > [30708.977075] XFS (loop1): xfs_log_force: error 5 returned.
> > [30708.978074] BUG: unable to handle kernel NULL pointer
> > dereference at 0000000000000230
> > [30708.979629] IP:  xfs_bdstrat_cb+0x27/0xd0
> > [xfs]
> And that indicates that the buftarg attached to the buffer has a
> NULL xfs_mount pointer, so it's probably related to the above issue.
> As it is, none of my machines see this problem, so I'm wondering if
> this is related to the way you are using loop devices. Can you
> reproduce it on a different type of storage device (like LVm of
> physical disk partitions)?
> Also, can you turn on CONFIG_XFS_DEBUG and all the memory
> leak/poisoning checks and see if that catches anything.
> Dave Chinner