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

[Mike Snitzer <snitzer@redhat.com>]

On Wed, Dec 01 2010 at  3:45pm -0500,
Milan Broz <mbroz@redhat.com> wrote:

> 
> On 12/01/2010 08:34 PM, Jon Nelson wrote:
> > Perhaps this is useful: for myself, I found that when I started using
> > 2.6.37rc3 that postgresql starting having a *lot* of problems with
> > corruption. Specifically, I noted zeroed pages, corruption in headers,
> > all sorts of stuff on /newly created/ tables, especially during index
> > creation. I had a fairly high hit rate of failure. I backed off to
> > 2.6.34.7 and have *zero* problems (in fact, prior to 2.6.37rc3, I had
> > never had a corruption issue with postgresql). I ran on 2.6.36 for a
> > few weeks as well, without issue.
> > 
> > I am using kcrypt with lvm on top of that, and ext4 on top of that.
> 
> With unpatched dmcrypt (IOW with Linus' git)? Then it must be ext4 or
> dm-core problem because there were no patches for dm-crypt...

Matt and Jon,

If you'd be up to it: could you try testing your dm-crypt+ext4
corruption reproducers against the following two 2.6.37-rc commits:

1) 1de3e3df917459422cb2aecac440febc8879d410
then
2) bd2d0210cf22f2bd0cef72eb97cf94fc7d31d8cc

Then, depending on results of no corruption for those commits, bonus
points for testing the same commits but with Andi and Milan's latest
dm-crypt cpu scalability patch applied too:
https://patchwork.kernel.org/patch/365542/

Thanks!
Mike