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: <AANLkTikJt-ZOmzj68Jw92rjGHzu0EP-uCVD+eNSO=vGd@mail.gmail.com>
Date:	Tue, 7 Dec 2010 12:10:49 -0600
From:	Jon Nelson <jnelson@...poni.net>
To:	Chris Mason <chris.mason@...cle.com>, 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@...il.com,
	linux-ext4@...r.kernel.org, Jon Nelson <jnelson@...poni.net>
Subject: Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt
 barrier support is effective)

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.

-- 
Jon
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