On Mon, 26 May 2014 22:39:16 +0600
Roman Mamedov <rm@romanrm.net> wrote:

> On Mon, 26 May 2014 14:28:51 +0200
> David Bloquel <david.bloquel@jimywoo.fr> wrote:
> 
> > [69537.117439]       Not tainted 3.12-0.bpo.1-amd64 #1
> 
> Try upgrading to the kernel 3.14. From what I can tell it has significant
> improvements/bugfixes in the snapshot deletion area. Just a couple of days ago
> I got a recurring lock-up after deleting 50 snapshots with tens of thousands of
> fragments of files in each (VM images, like in your case). Googled around a
> little bit, and found a similar issue with a report that 3.14 solves the
> problem. Upgraded to 3.14.4 (from 3.12.20), and voila, indeed it does.

Oh, I missed that your freezing happens during snapshot creation, not
deletion. But anyways, I think checking if the problem persists on the newest
kernel is still a good idea.

-- 
With respect,
Roman