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

[Dave Chinner]

On Wed, Feb 27, 2013 at 10:07:15AM -0500, Mike Snitzer wrote:
> 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?

$ grep issue_discards /etc/lvm/lvm.conf
    issue_discards = 0
$

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com