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: <AANLkTik=ivDrBEzg1wQAp5AFzNtRRq1=NpvnowggU=_0@mail.gmail.com>
Date:	Thu, 9 Dec 2010 14:38:00 -0600
From:	Jon Nelson <jnelson@...poni.net>
To:	"Ted Ts'o" <tytso@....edu>, Jon Nelson <jnelson@...poni.net>,
	Mike Snitzer <snitzer@...hat.com>,
	Chris Mason <chris.mason@...cle.com>,
	Matt <jackdachef@...il.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
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 2:13 PM, Ted Ts'o <tytso@....edu> wrote:
> On Thu, Dec 09, 2010 at 12:10:58PM -0600, Jon Nelson wrote:
>>
>> You should be OK, there. Are you using encryption or no?
>> I had difficulty replicating the issue without encryption.
>
> Yes, I'm using encryption.  LUKS with aes-xts-plain-sha256, and then
> LVM on top of LUKS.

Hmm.
The cipher is listed as:
aes-cbc-essiv:sha256

>> > If you can point out how to query pgsql_tmp (I'm using a completely
>> > default postgres install), that would be helpful, but I don't think it
>> > would be going anywhere else.
>>
>> Normally it's /var/lib/pgsql/data/pgsql_tmp (or
>> /var/lib/postgres/data/pgsql_tmp in your case). By placing
>> /var/lib/{postgresql,pgsql}/data on the LUKS + ext4 volume, on both
>> openSUSE 11.3 and Kubuntu, I was able to replicate the problem easily,
>> in VirtualBox. I can give qemu a try. In both cases I was using a
>> 2.6.37x kernel.
>
> Ah, I'm not using virtualization.  I'm running on a X410 laptop, on
> raw hardware.  Perhaps virtualization slows things down enough that it
> triggers?  Or maybe you're running with a more constrained memory than
> I?  How much memory do you have configured in your VM?

512MB.

'free' reports 75MB, 419MB free.

I originally noticed the problem on really real hardware (thinkpad
T61p), however.

-- 
Jon
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