[dm-devel] pvmove corrupting XFS filesystems (was Re: [BUG] Internal error xfs_dir2_data_reada_verify)

[Mike Snitzer]

On Tue, Feb 26 2013 at  8:49pm -0500,
Dave Chinner <david at fromorbit.com> wrote:

> On Wed, Feb 27, 2013 at 01:04:14AM +0000, Alasdair G Kergon wrote:
> > (Quick pointers that might be relevant)
> > 
> > EAGAIN, I'm not aware of dm itself returning that on the i/o path.
> 
> Neither am I, but it's coming from somewhere in the IO path...
> 
> > For 3.8 issues, read dm-devel around https://www.redhat.com/archives/dm-devel/2013-February/msg00086.html
> > (I queued the dm-side fixes for linux-next earlier today)
> 
> It's reproducable on lots of different kernels, apparently - 3.8,
> 3.4.33, CentOS 6.3, debian sid/wheezy and Fedora 18 were mentioned
> specifically by the OP - so it doesn't look like a recent
> regression or constrained to a specific kernel.
> 
> > For pvmove, check exactly which version and whether discards are enabled: there
> > was a userspace bug for a short period some time ago when discards were enabled.
> 
> The version I used to reproduce on a 3.8.0 kernel was:
> 
> $ pvmove --version
>   LVM version:     2.02.95(2) (2012-03-06)
>   Library version: 1.02.74 (2012-03-06)
>   Driver version:  4.23.1

Was issue_discards enabled in lvm.conf?

If so, as Alasdair said, this lvm2 2.02.97 fix is needed:
http://git.fedorahosted.org/cgit/lvm2.git/commit/?id=07a25c249b3e