On Wed, 27 May 2015, Andrey Wagin wrote:
...

I regularly execute criu tests on linux-next. For this, I use virtual
machine from the digitalocean clould. The current version of
linux-next hangs after a few seconds. I use git bisect to find the
commit where the problem is appeaed. And it looks like the problem is
in this patch.

...

Thanks,
Andrew

Perhaps this pending patch will help: 
http://marc.info/?l=linux-kernel&m=143219509918969&w=2

Thanks,
Scot