linux-kernel - Re: Apparent serious progressive ext4 data corruption bug in 3.6.3 (and other stable branches?)

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Date:	Fri, 26 Oct 2012 21:37:08 +0100
From:	Nix <nix@...eri.org.uk>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	"Ted Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Bryan Schumaker <bjschuma@...app.com>,
	Peng Tao <bergwolf@...il.com>, Trond.Myklebust@...app.com,
	gregkh@...uxfoundation.org, linux-nfs@...r.kernel.org
Subject: Re: Apparent serious progressive ext4 data corruption bug in 3.6.3 (and other stable branches?)

On 26 Oct 2012, Eric Sandeen outgrape:

> On 10/23/12 3:57 PM, Nix wrote:
>> The only unusual thing about the filesystems on this machine are that
>> they have hardware RAID-5 (using the Areca driver), so I'm mounting with
>> 'nobarrier': the full set of options for all my ext4 filesystems are:
>> 
>> rw,nosuid,nodev,relatime,journal_checksum,journal_async_commit,nobarrier,quota,
>> usrquota,grpquota,commit=30,stripe=16,data=ordered,usrquota,grpquota
>
> Out of curiosity, when I test log replay with the journal_checksum option, I
> almost always get something like:
>
> [  999.917805] JBD2: journal transaction 84121 on dm-1-8 is corrupt.
> [  999.923904] EXT4-fs (dm-1): error loading journal
>
> after a simulated crash & log replay.
>
> Do you see anything like that in your logs?

I'm not seeing any corrupt journals or abort messages at all. The
journal claims to be fine, but plainly isn't.

I can reproduce this on a small filesystem and stick the image somewhere
if that would be of any use to anyone. (If I'm very lucky, merely making
this offer will make the problem go away. :} )

-- 
NULL && (void)
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