[CRIU] unclear CRIU and docker problems

[Cyrill Gorcunov]

On Tue, Jun 30, 2015 at 11:06:48AM +0200, Adrian Reber wrote:
> On Tue, Jun 30, 2015 at 12:04:54PM +0300, Andrew Vagin wrote:
> > On Tue, Jun 30, 2015 at 10:32:49AM +0200, Adrian Reber wrote:
> > > So I am trying Ross Boucher's docker branch to checkpoint/restore docker
> > > containers and I can successfully checkpoint a container. If I try to
> > > restore a container CRIU exists pretty early with following error:
> > > 
> > > (00.002935) Warn  (cr-restore.c:1029): Set CLONE_PARENT | CLONE_NEWPID but it might cause restore problem,because not all kernels support such clone flags combinations!
> > > (00.002938) Forking task with 1 pid (flags 0x6c028000)
> > > (00.002952) Saved netns fd for links restore
> > > (00.002962) Error (cr-restore.c:1134): Can't fork for 1: Invalid argument
> > 
> > What is a kernel version?
> 
> It's 3.10 with a bunch of backports. Could be that some patches are missing.

Hmm, bunch of backports sounds like a cause of a problem.