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

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Date:	Tue, 07 Dec 2010 13:15:14 -0500
From:	Chris Mason <chris.mason@...cle.com>
To:	Jon Nelson <jnelson@...poni.net>
Cc:	Matt <jackdachef@...il.com>, Mike Snitzer <snitzer@...hat.com>,
	Milan Broz <mbroz@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	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)

Excerpts from Jon Nelson's message of 2010-12-07 13:10:49 -0500:
> I finally found some time to test this out. With 2.6.37-rc4 (openSUSE
> KOTD kernel) I easily encounter the issue.
> 
> Using a virtual machine, I created a stock, minimal openSUSE 11.3 x86_64
> install, installed all updates, installed postgresql and the 'KOTD'
> (Kernel of the Day)
> kernel, and ran the following tests (as postgres user because I'm
> lazy).
> 
> 1. create a database (from bash):
> 
> createdb test
> 
> 2. place the following contents in a file (I used 't.sql'):
> 
> begin;
> create temporary table foo as select x as a, ARRAY[x] as b FROM
> generate_series(1, 10000000 ) AS x;
> create index foo_a_idx on foo (a);
> create index foo_b_idx on foo USING GIN (b);
> rollback;
> 
> 3. execute that sql:
> 
> psql -f t.sql --echo-all test
> 
> 
> With 2.6.34.7 I can re-run [3] all day long, as many times as I want,
> without issue.
> 
> With 2.6.37-rc4-13 (the currently-installed KOTD kernel) if tails
> pretty frequently.
> 
> Then I tested with the 'vanilla' kernel available here:
> 
> http://download.opensuse.org/repositories/Kernel:/vanilla/standard/
> 
> The 'vanilla' kernel exhibited the same problems.
> The version I tested:  2.6.37-rc4-219-g771f8bc-vanilla.
> 
> Incidentally, quick tests of jfs, xfs, and ext3 do _not_ show the same
> problems, although I will note that I usually saw failure at least 1
> in 3, but sometimes had to re-run the sql test 4 or 5 times before I
> saw failure.
> 
> I will continue to do some testing, but I will hold off on testing the
> commits above until I receive further testing suggestions.
> 

Sorry if you already detailed this in another message, could you please
give information about how it fails?  Please include any kernel messages
(or point me at the past messages where you had them).

thanks
Chris
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