[CRIU] Criu issue : Error parsing proc fdinfo

[Smain Kahlouch]

Hello all and thank you for your answer.

my "unshare" version doesn't support the same options as you

unshare --help

Usage:
 unshare [options] <program> [args...]

Options:
 -h, --help        usage information (this)
 -m, --mount       unshare mounts namespace
 -u, --uts         unshare UTS namespace (hostname etc)
 -i, --ipc         unshare System V IPC namespace
 -n, --net         unshare network namespace

Anyway i'll wait for a next criu version which will hopefully support
namespaces :)

Regards,


2014/1/22 Andrew Vagin <avagin at parallels.com>

> On Tue, Jan 21, 2014 at 02:40:16PM +0100, Smain Kahlouch wrote:
> > Hello guys,
> >
> > I don't know if it's the right place to post this issue but I didn't find
> > another way to contact you.
> >
> > I'm currently testing lxc features ("docker" to be precise) and I'm
> facing the
> > following message when I try to use criu :
> >
> >
> > 1 - check if CRIU is working with my kernel :
> >
> > criu check --ms
> > (00.012246) Warn  (tun.c:55): Skipping tun support check
> > Looks good.
> >
> > 2 - Identify what i want to dump, for example varnish:
> >
> > init,1
> >   ├─acpid,3886
> >   ├─atd,3648
> >   ├─auditd,3591
> >   │   ├─audispd,3593
> >   │   │   └─{audispd},3598
> >   │   └─{auditd},3592
> >   ├─cron,3781
> >   ├─dbus-daemon,3883 --system
> >   ├─docker,3732 -d -p /var/run/docker.pid -r=false -s devicemapper
> >   │   ├─lxc-start,4592 -n
> > 9f81f7bc33c83fc1369b9355c959b6f0d8c87c6758bb75af3ae726ba2bad053a -f...
> >   │   │   └─sh,4601 -c /bin/bash -c '/usr/local/sbin/runservices.sh;
> /usr/sbin/
> > sshd -D'
> >   │   │       ├─bash,4685 -c /usr/local/sbin/runservices.sh;
> /usr/sbin/sshd -D
> >   │   │       │   └─sshd,5022 -D
> >   │   │       ├─cc-node,4774 /usr/bin/cc-node -d -p /var/run/cc-node.pid
> >   │   │       │   └─{cc-node},4776
> >   │   │       ├─collectdmon,4820 -P /var/run/collectdmon.pid -- -C /etc/
> > collectd/collectd.conf
> >   │   │       │   └─collectd,4822 -C /etc/collectd/collectd.conf -f
> >   │   │       │       ├─{collectd},4823
> >   │   │       │       ├─{collectd},4824
> >   │   │       │       ├─{collectd},4825
> >   │   │       │       ├─{collectd},4826
> >   │   │       │       ├─{collectd},4827
> >   │   │       │       └─{collectd},4828
> >   │   │       ├─rsyslogd,4729 -c5
> >   │   │       │   ├─{rsyslogd},4737
> >   │   │       │   ├─{rsyslogd},4738
> >   │   │       │   └─{rsyslogd},4739
> >   │   │       ├─ruby,4837 /usr/bin/collectd-interface-daemon -p 5000 -l
> /var/
> > log -P /var/run -I ...
> >   │   │       │   └─{ruby},7084
> >   │   │       └─varnishd,4792 -P /var/run/varnishd.pid -a :8000 -T :6082
> -f /
> > etc/varnish/default.vcl -p ...
> >   │   │           └─varnishd,4794 -P /var/run/varnishd.pid -a :8000 -T
> :6082 -f
> > /etc/varnish/default.vcl -p ...
> >   │   │               ├─{varnishd},4795
> >   │   │               ├─{varnishd},4796
> >   │   │               ├─{varnishd},4797
> >   │   │               ├─{varnishd},4798
> >   │   │               ├─{varnishd},4800
> >   │   │               ├─{varnishd},4801
> >   │   │               ├─{varnishd},4802
> >   │   │               ├─{varnishd},4803
> >   │   │               ├─{varnishd},4804
> >   │   │               ├─{varnishd},4805
> >   │   │               ├─{varnishd},4806
> >   │   │               ├─{varnishd},4807
> >   │   │               ├─{varnishd},4808
> >   │   │               ├─{varnishd},4809
> >   │   │               ├─{varnishd},4810
> >   │   │               ├─{varnishd},4811
> >   │   │               ├─{varnishd},4812
> >   │   │               └─{varnishd},4813
> >
> > 3 - try to dump
> >
> > criu dump --tree 4792 --images-dir /data/ --leave-stopped
> > pie: Error (pie/parasite.c:243): mount failed (-1)
> > pie: Error (pie/parasite.c:474): Close the control socket for writing
> > >
> > (00.095409) Error (parasite-syscall.c:787): Can't retrieve FD from socket
> > (00.095454) Error (parasite-syscall.c:297): Message reply from daemon is
> > trimmed (12/0)
> > (00.095468) Error (cr-dump.c:1441): Can't get proc fd (pid: 4792)
> > (00.096172) Error (cr-dump.c:1811): Dumping FAILED.
> >
> >
> > I built a custom kernel from 3.12.6 debian sources.
> >
> > I followed the instructions in your website
> >
> > Could you please help me to fix that.
>
> You are trying to dump a task from another pidns. Unfortunately it's
> unsupported by now. I'm going to fix that. I think it will not require too
> much time. Thank you for the report.
>
> Currently you can workaround this issue, if you enter in this pidns and
> mount procfs in /proc.
>
> unshare -m nsenter -p -t PID criu.sh
>
> # cat criu.sh
> set -e
> mount -make-rprivate /
> mount -t proc proc /proc
> criu dump --tree PID --images-dir /data/ --leave-stopped
>
> >
> > Thanks,
> > Smana
>
> > _______________________________________________
> > CRIU mailing list
> > CRIU at openvz.org
> > https://lists.openvz.org/mailman/listinfo/criu
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openvz.org/pipermail/criu/attachments/20140122/78e1bed5/attachment-0001.html>