[CRIU] hang in ip tool

[Tycho Andersen]

Hi all,

On Wed, Sep 03, 2014 at 06:45:39PM +0400, Pavel Emelyanov wrote:
> On 09/03/2014 05:52 PM, Tycho Andersen wrote:
> > Hi all,
> > 
> > Recently when restoring containers I have been getting a hang in the
> > ip tool when criu runs 'ip addr restore'. It prints,
> > 
> > RTNETLINK answers: File exists
> > RTNETLINK answers: File exists
> 
> I've seen such when it was putting 127.0.0.1 on lo which was
> already there "automatically" (some kernels seem to do it by
> default).
> 
> > and then seems to hang. Has anyone seen this behavior, or any ideas
> > what the problem is?
> 
> Hanging is something new to me, I've never seen it. Can you 
> strace it to check where the problem is?

So this issue did just resurface and it turns out that it's not
actually hanging in ip tool, it is hanging in cr_system in the
sigprocmask call where it is resetting the mask. As I write this, it
seems to have gone away again. Any ideas what might cause this?

Thanks,

Tycho

> > Thanks,
> > 
> > Tycho
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>