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Re: "Corrupt dinode 6242615, (btree extents). This is a bug."

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: "Corrupt dinode 6242615, (btree extents). This is a bug."
From: Hanne Munkholm <hanne@xxxxxxxxxx>
Date: Tue, 9 Aug 2011 10:47:23 +0200 (CEST)
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20110808235859.GN3162@dastard>
References: <alpine.OSX.1.00.1108081203550.26464@xxxxxxxxxxxxxxxxxx> <20110808235859.GN3162@dastard>
User-agent: Alpine 1.00 (OSX 882 2007-12-20)
Thank you very much.

I have my file system running again.

The real problem turned out to be that the device had changed
it's name from sdc to sdd. I have seen that before and should
have noticed. It refused to mount the file system with the same
ID "again" even after xfs_repair because it had not been really
umounted from sdc.

My dmesg was cluttered by a lot of kernel traces instead
of the revealing "Filesystem "sdc": xfs_log_force: error 5
returned." until after the xfs_repair, however, I could see that
the device name had changed and should have known what it meant.

I had to reboot to fix the problem. I now wonder if a reboot
right away had done it, and xfs had happily recovered, or the
xfs_repair was needed. In both cases, the log would have been
lost anyway.

It was the segfault that made me write to the list. I can see
why I got the segfault when running in -n mode, I suspected that
myself, but I wasn't sure, I needed someone to tell me that I
should not panic :).

Now I have one more experience with xfs, and next time someone
googles this they might not have to ask.

Thank you very much for your time.

Med venlig hilsen / Best regards
--
Hanne Munkholm                      Email: hanne@xxxxxxxxxx
Systemadministrator                 Tlf: +45 35 32 13 49

Bioinformatik-centret
Københavns Biocenter, Biologisk Institut
Ole Maaløes Vej 5, 2200 København N



On Tue, 9 Aug 2011, Dave Chinner wrote:

On Mon, Aug 08, 2011 at 12:05:09PM +0200, Hanne Munkholm wrote:
Hi list.

I have an xfs file system which got damaged due to not being
properly unmounted before the iSCSI connection terminated (I
think. Corrupted it is).

I cannot mount it. mount: wrong fs type, bad option, bad superblock
on /dev/sdd,
        missing codepage or helper program, or other error
        In some cases useful info is found in syslog - try
        dmesg | tail  or so

That is the default error message from mount when the kernel throws
and error. The error message in dmesg will tell you exactly what the
error was - can you post that?

xfs_check suggests running xfs_repair -L. ERROR: The filesystem has
valuable metadata changes in a log
which needs to be replayed.  Mount the filesystem to replay the log, and
unmount it before re-running xfs_check.  If you are unable to mount the
filesystem, then use the xfs_repair -L option to destroy the log and attempt a
repair.  Note that destroying the log may cause corruption -- please
attempt a mount of the filesystem before doing this.

I haven't done that yet.

You won't be able to because mounting is failing. Hence you only
option for recovery is to use xfs_repair -L to zero the log.

Instead I ran
xfs_repair -n.
I got a lot of output that looks promising for a repair IMO, at
least it acknowleges an xfs system beoing there:

xfs_repair -n /dev/sdd
Phase 1 - find and verify superblock...
Phase 2 - using internal log
         - scan filesystem freespace and inode maps...
         - found root inode chunk
Phase 3 - for each AG...
         - scan (but don't clear) agi unlinked lists...
         - process known inodes and perform inode discovery...
         - agno = 0
bad nblocks 952 for inode 6242615, would reset to 972
bad nextents 182 for inode 6242615, would reset to 185
imap claims a free inode 13352640 is in use, would correct imap and clear inode
imap claims a free inode 13352641 is in use, would correct imap and clear inode
<snip>
        - agno = 1
         - agno = 2
         - agno = 3
         - process newly discovered inodes...
Phase 4 - check for duplicate blocks...
         - setting up duplicate extent list...
         - check for inodes claiming duplicate blocks...
         - agno = 0
         - agno = 3
         - agno = 2
         - agno = 1
bad nblocks 952 for inode 6242615, would reset to 972
bad nextents 182 for inode 6242615, would reset to 185
entry "sample_000001299840_0_0.000000.pdb" at block 764 offset
2512 in directory inode 6242615 references free inode 13352640
        would clear inode number in entry at offset 2512...
entry "sample_000001299860_0_0.000000.pdb" at block 764 offset
2560 in directory inode 6242615 references free inode 13352641
<snip>
No modify flag set, skipping phase 5
Phase 6 - check inode connectivity...
         - traversing filesystem ...
corrupt dinode 6242615, (btree extents).  This is a bug.

That's one of the inodes that has already been found to be bad, and
woul dhave had parts of it fixed before getting to phase 6. Hence
this problem may have already been fixed by this stage.

Please capture the filesystem metadata with xfs_metadump and
report it to xfs@xxxxxxxxxxxx
corrupt dinode 6242615, (btree extents).  This is a bug.
Please capture the filesystem metadata with xfs_metadump and
report it to xfs@xxxxxxxxxxxx
corrupt dinode 6242615, (btree extents).  This is a bug.
Please capture the filesystem metadata with xfs_metadump and
report it to xfs@xxxxxxxxxxxx
Segmentation fault

And the chance is that this won't happen.

I have placed a xfs_metadump here:
http://people.binf.ku.dk/hanne/tmp/metadata.gz

Downloading it now. it's about 550MB, so will take a little while...

Cheers,

Dave.

--
Dave Chinner
david@xxxxxxxxxxxxx

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