linux-ext4 - Re: Possible ext4 corruption

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Message-Id: <1236719691.16191.9.camel@kulgan.wumi.org.au>
Date:	Wed, 11 Mar 2009 07:44:51 +1030
From:	Kevin Shanahan <kmshanah@...b.org.au>
To:	Theodore Tso <tytso@....edu>
Cc:	Andreas Dilger <adilger@....com>,
	Eric Sandeen <sandeen@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: Possible ext4 corruption - ACL related?

On Tue, 2009-03-10 at 10:46 -0400, Theodore Tso wrote:
> > > hermes:~# debugfs /dev/dm-0 
> > > debugfs 1.41.3 (12-Oct-2008)
> > > debugfs:  stat "local/apps/Gestalt.Net/SetupCD/program files/Business Objects/Common/3.5/bin/Cdo32sv.dll"
> > > 
> > > Gives the following output:
> > > 
> > >   Inode: 867   Type: bad type    Mode:  0404   Flags: 0x802a61af
> > >   Generation: 2483046020    Version: 0xb9286359:17a7fdfd
> > >   User: 1455931783   Group: -798021131   Size: -1808719531
> > >   File ACL: 141934744    Directory ACL: 0
> > >   Links: 15681   Blockcount: 171984001880781
> > >   Fragment:  Address: 956780679    Number: 0    Size: 0
> > >    ctime: 0xdca60244:006c5b08 -- Wed Apr 23 01:54:36 2087
> > >    atime: 0x5c9e956c:777587a4 -- Sat Mar 30 08:30:12 2019
> > >    mtime: 0x2ce44e11:286138f8 -- Sat Nov 13 13:31:37 1993
> > >   crtime: 0x737781cb:5661f351 -- Thu May 22 19:54:11 2031
> > >   dtime: 0xf19c4882 -- Sat Jun 14 11:57:14 2098
> > >   Size of extra inode fields: 3625
> > >   BLOCKS:
> 
> This looks like a block written to the wrong place on disk.  One of
> the things that can be done is to dump out the disk block
> corresponding to inode #867 before the fsck, and see if we can
> recognize what the source of the block was.

Thanks Ted. Just so I know what I'm doing if/when this comes up again, I
guess the process would be:

  - debugfs /dev/some-filesystem
  - debugfs:  stat "some/problem/file"
  - get the inode number from the output above (867 in this case)
  - debugfs dump 867 inode867.bin

Or perhaps running e2fsck -n first to see which inodes really look
corrupted and get the numbers that way. 

> Failures like this have been reported on ext3 filesystems as well, but
> it's rare, and it's been written off to hardware failure, although it
> could be really anything --- from the device driver, block layer, a
> filesystem problem, or hardware hiccup.
> 
> Given that you've fixed it, all I think we can tell you is to keep an
> eye out for any further failures....

Thanks, will do.

Cheers,
Kevin.


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