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

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Date:	Thu, 9 Dec 2010 15:13:59 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Jon Nelson <jnelson@...poni.net>
Cc:	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 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.

> > 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?

    	     	       	   		      - Ted
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