Re: xfs_iunlink_remove: xfs_inotobp() returned error 22 -- debugging

[符永涛 <yongtaofu@xxxxxxxxx>]

Dear Eric,

If it's racing issue where the lock is introduced? I want to study the code from you. Thank you.

2013/4/19 符永涛 <yongtaofu@xxxxxxxxx>

Sure the serious thing here is that it corrupt the unlinked list. The inode 0x1bd33 which trigger xfs shutdown is not  0x6b133.

2013/4/19 Eric Sandeen <sandeen@xxxxxxxxxxx>

On 4/19/13 4:41 AM, 符永涛 wrote:
> Dear Brian and Eric,
>

> kernel kernel-2.6.32-279.19.1.el6.x86_64.rpm <http://mirror.linux.duke.edu/pub/centos/6.3/updates/x86_64/Packages/kernel-2.6.32-279.19.1.el6.x86_64.rpm> still have this problem

> I build the kernel from this srpm
> https://oss.oracle.com/ol6/SRPMS-updates/kernel-2.6.32-279.19.1.el6.src.rpm
>
> today the shutdown happens again during test.
> Seelogs bellow:
>
> /var/log/message
> Apr 19 16:40:05 10 kernel: XFS (sdb): xfs_iunlink_remove: xfs_inotobp() returned error 22.
> Apr 19 16:40:05 10 kernel: XFS (sdb): xfs_inactive: xfs_ifree returned error 22
> Apr 19 16:40:05 10 kernel: XFS (sdb): xfs_do_force_shutdown(0x1) called from line 1184 of file fs/xfs/xfs_vnodeops.c.  Return address = 0xffffffffa02d4bda
> Apr 19 16:40:05 10 kernel: XFS (sdb): I/O Error Detected. Shutting down filesystem
> Apr 19 16:40:05 10 kernel: XFS (sdb): Please umount the filesystem and rectify the problem(s)
> Apr 19 16:40:07 10 kernel: XFS (sdb): xfs_log_force: error 5 returned.
> Apr 19 16:40:37 10 kernel: XFS (sdb): xfs_log_force: error 5 returned.
>
> systemtap script output:
> --- xfs_imap -- module("xfs").function("xfs_imap@fs/xfs/xfs_ialloc.c:1257").return -- return=0x16
> vars: mp=0xffff88101801e800 tp=0xffff880ff143ac70 ino=0xffffffff imap=0xffff88100e93bc08 flags=0x0 agbno=? agino=? agno=? blks_per_cluster=? chunk_agbno=? cluster_agbno=? error=? offset=? offset_agbno=? __func__=[...]
> mp: m_agno_log = 0x5, m_agino_log = 0x20
> mp->m_sb: sb_agcount = 0x1c, sb_agblocks = 0xffffff0, sb_inopblog = 0x4, sb_agblklog = 0x1c, sb_dblocks = 0x1b4900000
> imap: im_blkno = 0x0, im_len = 0xe778, im_boffset = 0xd997
> kernel backtrace:
> Returning from:  0xffffffffa02b4260 : xfs_imap+0x0/0x280 [xfs]
> Returning to  :  0xffffffffa02b9d59 : xfs_inotobp+0x49/0xc0 [xfs]
>  0xffffffffa02b9ec1 : xfs_iunlink_remove+0xf1/0x360 [xfs]
>  0xffffffff814ede89
>  0x0 (inexact)
> user backtrace:

>  0x3ec260e5ad [/lib64/libpthread-2.12.so <http://libpthread-2.12.so>+0xe5ad/0x219000]

>
> --- xfs_iunlink_remove -- module("xfs").function("xfs_iunlink_remove@fs/xfs/xfs_inode.c:1681").return -- return=0x16
> vars: tp=0xffff880ff143ac70 ip=0xffff8811ed111000 next_ino=? mp=? agi=? dip=? agibp=? ibp=? agno=? agino=? next_agino=? last_ibp=? last_dip=0xffff881000000001 bucket_index=? offset=? last_offset=0xffffffffffff8811 error=? __func__=[...]
> ip: i_ino = 0x1bd33, i_flags = 0x0
> ip->i_d: di_nlink = 0x0, di_gen = 0x53068791
>
> debugfs events trace:
> https://docs.google.com/file/d/0B7n2C4T5tfNCREZtdC1yamc0RnM/edit?usp=sharing

Same issue, one file was unlinked twice in a race:

=== ino 0x6b133 ===
           <...>-4477  [003]  2721.176790: xfs_iunlink: dev 8:16 ino 0x6b133
           <...>-4477  [003]  2721.176839: xfs_iunlink_remove: dev 8:16 ino 0x6b133
           <...>-4477  [009]  3320.127227: xfs_iunlink: dev 8:16 ino 0x6b133
           <...>-4477  [001]  3320.141126: xfs_iunlink_remove: dev 8:16 ino 0x6b133
           <...>-4477  [003]  7973.136368: xfs_iunlink: dev 8:16 ino 0x6b133
           <...>-4479  [018]  7973.158457: xfs_iunlink: dev 8:16 ino 0x6b133
           <...>-4479  [018]  7973.158497: xfs_iunlink_remove: dev 8:16 ino 0x6b133

-Eric

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符永涛

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符永涛