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

[Eric Sandeen <sandeen@sandeen.net>]

On 4/19/13 8:18 AM, 符永涛 wrote:
> Dear Eric,
> If it's racing issue where the lock is introduced? I want to study the code from you. Thank you.
> 

essentially:

xfs_remove()
{
...
        xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
...
	xfs_droplink()

You are 100% sure that you were running the 279.19.1 kernel?

(I'm not very familiar with Oracle's clone of RHEL - I assume that they have copied all of Red Hat's work verbatim, but I have not looked)

Can you verify that in:

__rwsem_do_wake()

the undo target looks like:

  out:
        return sem;


        /* undo the change to the active count, but check for a transition
         * 1->0 */
  undo:
        if (rwsem_atomic_update(-RWSEM_ACTIVE_BIAS, sem) & RWSEM_ACTIVE_MASK)
                goto out;
        goto try_again;


thanks,
-Eric

> 2013/4/19 符永涛 <yongtaofu@gmail.com <mailto:yongtaofu@gmail.com>>
> 
>     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@sandeen.net <mailto:sandeen@sandeen.net>>
> 
>         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> <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
> 
> 
> 
> 
>     -- 
>     符永涛
> 
> 
> 
> 
> -- 
> 符永涛

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