From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1752690Ab0LJGwY (ORCPT <rfc822;w@1wt.eu>);
	Fri, 10 Dec 2010 01:52:24 -0500
Received: from mail-bw0-f45.google.com ([209.85.214.45]:48117 "EHLO
	mail-bw0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751106Ab0LJGwX convert rfc822-to-8bit (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Fri, 10 Dec 2010 01:52:23 -0500
MIME-Version: 1.0
In-Reply-To: <20101210023852.GB3059@thunk.org>
References: <20101207182243.GB21112@redhat.com> <20101207193514.GA2921@thunk.org>
 <AANLkTim8UTkfxXV0AkEfjNq3tcmnrXdh6BQ1ibY5iYPy@mail.gmail.com>
 <20101209180111.GF2921@thunk.org> <AANLkTimAUB5L5Ptm4Fv=sQUmL9_P5azPRCKQnmU89xs8@mail.gmail.com>
 <20101209201359.GG2921@thunk.org> <AANLkTik=ivDrBEzg1wQAp5AFzNtRRq1=NpvnowggU=_0@mail.gmail.com>
 <20101209231616.GA12515@basil.fritz.box> <1291945065-sup-1838@think>
 <AANLkTi=SgzVcOwqJfAHBe5U+1CuhPnm0eKet4hRM2JKz@mail.gmail.com> <20101210023852.GB3059@thunk.org>
From: Jon Nelson <jnelson@jamponi.net>
Date: Fri, 10 Dec 2010 00:52:01 -0600
Message-ID: <AANLkTikJ1Q=L15wcMLn=U8-Qx9PbppY-AX=LpmjDkk2V@mail.gmail.com>
Subject: Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt
 barrier support is effective)
To: "Ted Ts'o" <tytso@mit.edu>, Matt <jackdachef@gmail.com>,
        Chris Mason <chris.mason@oracle.com>, Andi Kleen <andi@firstfloor.org>,
        Jon Nelson <jnelson@jamponi.net>, Mike Snitzer <snitzer@redhat.com>,
        Milan Broz <mbroz@redhat.com>,
        linux-btrfs <linux-btrfs@vger.kernel.org>,
        dm-devel <dm-devel@redhat.com>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        htd <htd@fancy-poultry.org>, htejun <htejun@gmail.com>,
        linux-ext4 <linux-ext4@vger.kernel.org>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8BIT
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Thu, Dec 9, 2010 at 8:38 PM, Ted Ts'o <tytso@mit.edu> wrote:
> On Fri, Dec 10, 2010 at 02:53:30AM +0100, Matt wrote:
>>
>> Try a kernel before 5a87b7a5da250c9be6d757758425dfeaf8ed3179
>>
>> from the tests I've done that one showed the least or no corruption if
>> you count the empty /etc/env.d/03opengl as an artefact
>
> Yes, that's a good test.  Also try commit bd2d0210cf.  The patch
> series that is most likely to be at fault if there is a regression in
> between 5a87b7a5d and bd2d0210cf inclusive.
>
> I did a lot of testing before submitting it, but that wa a tricky
> rewrite.  If you can reproduce the problem reliably, it might be good
> to try commit 16828088f9 (the commit before 5a87b7a5d) and commit
> bd2d0210cf.  If it reliably reproduces on bd2d0210cf, but is clean on
> 16828088f9, then it's my ext4 block i/o submission patches, and we'll
> need to either figure out what's going on or back out that set of
> changes.
>
> If that's the case, a bisect of those changes (it's only 6 commits, so
> it shouldn't take long) would be most appreciated.

I observed the behavior on bd2d0210cf in a qemu-kvm install of
openSUSE 11.3 (x86_64) on *totally* different host - an AMD quad-core.

I did /not/ observe the behavior on 16828088f9 (yet). I'll run the
test a few more times on 1682..

Additionally, I am building a bisected kernel now (
cb20d5188366f04d96d2e07b1240cc92170ade40 ), but won't be able to get
back at it for a while.

I hope this helps.

-- 
Jon