[CRIU] failure dumping nginx in docker container

[Pavel Emelyanov]

On 06/19/2015 01:57 AM, Ross Boucher wrote:
> I made some further progress trying to checkpoint/restore nginx in docker. I set things up in the 3.19 kernel and was able to successfully checkpoint the container. Restore failed with this log:
> 
> https://gist.github.com/boucher/fa016de5d142988abe3a
> 
> Any idea what's going on here?

(00.032159) 1: File pipe:[44496] will be restored from fd 9 duped from inherit fd 8
(00.032160) 1: Error (util.c:131): fd 5 already in use (called at files.c:872) 

The fd 5 was occupied at the restore time. The easiest way to resolve this is to strace
restoring process (with -f and -s 256 keys) then checking the log where the 5th descriptor
appeared from.

-- Pavel

> 
> On Thu, Jun 4, 2015 at 2:18 PM, Pavel Emelyanov <xemul at parallels.com <mailto:xemul at parallels.com>> wrote:
> 
>     On 06/05/2015 12:14 AM, Saied Kazemi wrote:
>     > Thanks for the explanation.  From your explanation, I assume that back porting Al Viro's patch
>     > to 3.18 is not an option.  Correct?
> 
>     _Only_ Al's patch -- yes, it wouldn't help. Back-porting both patches -- Al's and
>     mine -- will make things work.
> 
>     -- Pavel
> 
>