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SubjectRe: ext3 on raid5 failure
Theodore Ts'o wrote:
>
>>
>>sfhq:/mnt/data/1/lost+found# ls -l
>>total 76
>>d-wSr----- 2 1212680233 136929556 49152 Jun 7 2008 #16370
>>-rwx-wx--- 1 1628702729 135220664 45056 May 4 1974 #16380
>
>
> Ok, this looks like random garbage has gotten written into inode table.
>
> If you can make this happen consistently with 2.6 and not with 2.4,
> then that would be useful to know. There may be some kind of race
> condition or problem with either the raid5 code, or the combination of
> raid5 plus ext3. It's unlikely this kind of error would be caused by
> a flaw in the ext3 code alone, since this is indicative of complete
> garbage written to the inode table, or a block intended for another
> location on disk getting written to the inode table. The natural
> suspect is at the block device layer and below.
>

I've seen this kind of problems on my notebook too. Among others, over
600MB of a huge cache directory (from a news reader) was having "funny"
permissions. Maybe more files were affected. I used fsck.ext3 and
changed the attributes with chmod.

It may be caused by crashes of the notebook (power failure and
suspend/resume failure), but I would expect that the administration of
the fs would survive that, as it did for years. Actually, the last time
I had filesystem corruption was in kernel 1.2.xx days...

As my notebook is not using raid, I suspect something in the ext3 code.
Kernel is 2.6.1 with ACPI, acpi-dsdt and swsusp2 patches.

Regards,

Bas.



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