linux-ext4 - Re: Weird filesystem corruption from wayland / radeon / chromium

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Date:	Mon, 12 Nov 2012 16:00:35 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	linux-ext4@...r.kernel.org
Subject: Re: Weird filesystem corruption from wayland / radeon / chromium

On 11/2/12 10:50 AM, Tim Landscheidt wrote:
> (anonymous) wrote:
> 
>> FYI, after fsck'ing, I checked my filesystem against my backup, and didn't
>> find anything that changed that shouldn't have changed.  Command I used
>> was:
> 
>> rsync -imva --compare-dest=/ /media/4tb/bak/dancer-2012-09-04/ /media/4tb/bak/changes/
> 
> I ran (or rather run) into this issue as well.  Starting on
> October 22nd, I saw on my Fedora 16 (3.6.2-1.fc16.i686) sys-
> tem:
> 
> | Oct 22 13:56:44 passepartout kernel: [ 1395.772939] EXT4-fs error (device dm-4): ext4_ext_search_left:1238: inode #274258: comm flush-253:4: ix (3666) != EXT_FIRST_INDEX (0) (depth 0)!
> | Oct 22 13:56:44 passepartout kernel: [ 1395.772951] EXT4-fs (dm-4): delayed block allocation failed for inode 274258 at logical offset 3666 with max blocks 3 with error -5
> | Oct 22 13:56:44 passepartout kernel: [ 1395.772955] EXT4-fs (dm-4): This should not happen!! Data will be lost
> | Oct 22 13:56:44 passepartout kernel: [ 1395.772957]
> 
> and it continued intermittently.  Last message before "yes-
> terday"'s shutdown was:
> 
> | Nov  2 04:14:09 passepartout kernel: [51109.016422] EXT4-fs error (device dm-4): ext4_ext_search_left:1304: inode #274258: comm flush-253:4: ix (3666) != EXT
> | _FIRST_INDEX (0) (depth 0)!
> | Nov  2 04:14:09 passepartout kernel: [51109.016428] EXT4-fs (dm-4): delayed block allocation failed for inode 274258 at logical offset 3792 with max blocks 2
> |  with error -5
> | Nov  2 04:14:09 passepartout kernel: [51109.016431] EXT4-fs (dm-4): This should not happen!! Data will be lost
> | Nov  2 04:14:09 passepartout kernel: [51109.016431]
> 
> Looking at today's boot.log, I see no error detected by
> "File System Check", and the manual run of "e2fsck -f"
> showed also no errors.

Hm, on the image you provided to me for analysis, it was
indeed somewhat corrupted; I got about 400 lines of output
from e2fsck.  However - did you take the image while it was
mounted, or did you unmount it first?


Anyway, inode 274258 wasn't in the fsck output.

However, I can reproduce the error you got:

[429903.549764] EXT4-fs error (device loop0): ext4_ext_search_left:1252: inode #274258: comm flush-7:0: ix (3666) != EXT_FIRST_INDEX (0) (depth 0)!

so I'll see what's going on here.

Thanks,
-Eric


> Shortly after starting Chrome, the messages reappeared
> again:
> 
> | Nov  2 15:15:48 passepartout kernel: [ 1979.196296] EXT4-fs error (device dm-4): ext4_ext_search_left:1304: inode #274258: ix (3666) != EXT_FIRST_INDEX (0) (depth 0)!
> | Nov  2 15:15:48 passepartout kernel: [ 1979.196306] EXT4-fs (dm-4): delayed block allocation failed for inode 274258 at logical offset 3672 with max blocks 2 with error -5
> | Nov  2 15:15:48 passepartout kernel: [ 1979.196308] EXT4-fs (dm-4): This should not happen!! Data will be lost
> | Nov  2 15:15:48 passepartout kernel: [ 1979.196308]
> 
> And indeed:
> 
> | [root@...separtout ~]# find ~tim -inum 274258
> | /home/tim/.cache/google-chrome/Default/Cache/data_3
> | [root@...separtout ~]#
> 
> So somehow Chromium/Chrome seems to be able to trigger ker-
> nel messages indicating a file system error while no actual
> file system errors seem to occur (very big assumption here
> because I have no idea how to detect if "data_3" is cor-
> rupted).
> 
> In my yum.log, I don't see any obvious package update prior
> to October 22nd.  kernel was updated on October 23rd, Chrome
> on October 12th (22.0.1229.94-161065.i386).
> 
> Any ideas?
> 
> TIA,
> Tim
> 
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