XFS internal error xfs_btree_check_sblock

[David Greaves <david@dgreaves.com>]

Hi

I've been having problems with this filesystem for a while now.

I upgraded to 2.6.23 to see if it's improved (no).

Once every 2 or 3 cold boots I get this in dmesg as the user logs in and
accesses the /scratch filesystem. If the error doesn't occur as the user logs in
then it won't happen at all.

Filesystem "dm-0": XFS internal error xfs_btree_check_sblock at line 334 of file
fs/xfs/xfs_btree.c.  Caller 0xc01b7bc1
 [<c010511a>] show_trace_log_lvl+0x1a/0x30
 [<c0105d72>] show_trace+0x12/0x20
 [<c0105d95>] dump_stack+0x15/0x20
 [<c01dd34f>] xfs_error_report+0x4f/0x60
 [<c01cfcb6>] xfs_btree_check_sblock+0x56/0xd0
 [<c01b7bc1>] xfs_alloc_lookup+0x181/0x390
 [<c01b7e23>] xfs_alloc_lookup_eq+0x13/0x20
 [<c01b5594>] xfs_free_ag_extent+0x2f4/0x690
 [<c01b7164>] xfs_free_extent+0xb4/0xd0
 [<c01c1979>] xfs_bmap_finish+0x119/0x170
 [<c0209aa7>] xfs_remove+0x247/0x4f0
 [<c0211cc2>] xfs_vn_unlink+0x22/0x50
 [<c0172f28>] vfs_unlink+0x68/0xa0
 [<c01751e9>] do_unlinkat+0xb9/0x140
 [<c0175280>] sys_unlink+0x10/0x20
 [<c010420a>] syscall_call+0x7/0xb
 =======================
xfs_force_shutdown(dm-0,0x8) called from line 4274 of file fs/xfs/xfs_bmap.c.
Return address = 0xc0214dae
Filesystem "dm-0": Corruption of in-memory data detected.  Shutting down
filesystem: dm-0
Please umount the filesystem, and rectify the problem(s)

I ssh in as root, umount, mount, umount and run xfs_repair.

This is what I got this time:

Phase 2 - using internal log
        - zero log...
        - scan filesystem freespace and inode maps...
ir_freecount/free mismatch, inode chunk 59/5027968, freecount 27 nfree 26
        - found root inode chunk

All the rest was clean.

It is possible this fs suffered in the 2.6.17 timeframe
It is also possible something got broken whilst I was having lots of issues with
 hibernate (which is still unreliable).

I wonder if the fs is borked and xfs_repair isn't fixing it?

David
PS Please cc on replies.