linux-ext4 - Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt barrier support is effective)

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Message-ID: <AANLkTi=eL-tMYLXuoeqeKg_k-Sjxy4d0Lxdk5YEjXQf4@mail.gmail.com>
Date:	Thu, 9 Dec 2010 20:05:05 -0600
From:	Jon Nelson <jnelson@...poni.net>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Mike Fedyk <mfedyk@...efedyk.com>,
	Andi Kleen <andi@...stfloor.org>, "Ted Ts'o" <tytso@....edu>,
	Mike Snitzer <snitzer@...hat.com>, Matt <jackdachef@...il.com>,
	Milan Broz <mbroz@...hat.com>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	dm-devel <dm-devel@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	htd <htd@...cy-poultry.org>, htejun <htejun@...il.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt
 barrier support is effective)

On Thu, Dec 9, 2010 at 8:00 PM, Chris Mason <chris.mason@...cle.com> wrote:
> Excerpts from Mike Fedyk's message of 2010-12-09 20:58:40 -0500:
>> On Thu, Dec 9, 2010 at 5:38 PM, Chris Mason <chris.mason@...cle.com> wrote:
>> > Excerpts from Andi Kleen's message of 2010-12-09 18:16:16 -0500:
>> >> > 512MB.
>> >> >
>> >> > 'free' reports 75MB, 419MB free.
>> >> >
>> >> > I originally noticed the problem on really real hardware (thinkpad
>> >> > T61p), however.
>> >>
>> >> If you can easily reproduce it could you try a git bisect?
>> >
>> > Do we have a known good kernel?  I looked back through the thread and
>> > didn't see any reports where the postgres test on ext4 passed in this
>> > config.
>> >
>>
>> 2.6.34.something.  -- Any chance a newer kernel can be tested to be found good?
>
> But he is triggering the ext4 corruption without dm-crypt.  I think
> dm-crypt was still used somewhere on the system during the test, just
> not on the partitions that actually hit the corruption.

I now have my doubts about being able to trigger it without dm-crypt.
I stand by my report, but I'm also unable to reproduce it after after
50 test iterations. I did run 2.6.36 for a few weeks without any issue
that I recall.



-- 
Jon
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