XFS: I/O Error Detected / 2.6.27.39

[Eric Sandeen]

On 11/16/10 7:10 AM, Piotr Kandziora wrote:
> Hi,
> 
> Our environment is following:
> - we have 24GB RAM,
> - we are using 3ware controller (and it does not report any errors),
> - we have one big logical volume (20TB) exported via NFS with large amount of small files (about 150k),
> - we are doing periodically backup of this logical volume using rsync to another server.
> - we have kernel 2.6.27.39,
> 
> Unfortunately our system is freezing unexpectedly without reason. We started investigating this problem and noticed that cache memory is slowly increasing.
> 
> We tried to dump this cache memory using:
> /bin/echo "3" > /proc/sys/vm/drop_caches
> 
> In a result, cache was dumped, but in logs we noticed a lot of errors with XFS:
> 
> [kern.warning] kernel: xfs_iunlink_remove: xfs_inotobp()  returned an error 22 on dm-16.  Returning error.

so this got EINVAL:

#define EINVAL          22      /* Invalid argument */

> [kern.notice] kernel: xfs_inactive:\011xfs_ifree() returned an error = 22 on dm-16
> [kern.notice] kernel: xfs_force_shutdown(dm-16,0x1) called from line 1406 of file fs/xfs/xfs_vnodeops.c.  Return address = 0x
> [kern.alert] kernel: Filesystem \"dm-16\": I/O Error Detected.  Shutting down filesystem: dm-16

which shut down the filesystem:

> [kern.alert] kernel: Please umount the filesystem, and rectify the problem(s)

leading to IO errors after that:

#define EIO              5      /* I/O error */

> [kern.warning] kernel: xfs_imap_to_bp: xfs_trans_read_buf()returned an error 5 on dm-16.  Returning error.
> [kern.warning] kernel: xfs_imap_to_bp: xfs_trans_read_buf()returned an error 5 on dm-16.  Returning error.
> [kern.warning] kernel: xfs_imap_to_bp: xfs_trans_read_buf()returned an error 5 on dm-16.  Returning error.
> 
> We are wondering if this is problem connected to hardware or rather this is XFS problem (if yes, was it fixed?).

I'd probably start with xfs_repair (with -n if you want a dry run)
and see if it finds any metadata corruption, first.

-Eric
 
> Best regards
> Piotr K
> 
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