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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 10 Dec 2010 00:52:01 -0600
From:	Jon Nelson <jnelson@...poni.net>
To:	"Ted Ts'o" <tytso@....edu>, Matt <jackdachef@...il.com>,
	Chris Mason <chris.mason@...cle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Jon Nelson <jnelson@...poni.net>,
	Mike Snitzer <snitzer@...hat.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 8:38 PM, Ted Ts'o <tytso@....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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/