[CRIU] LXC DUMP ERROR

[Tycho Andersen]

On Thu, Oct 02, 2014 at 06:28:48PM +0400, Pavel Emelyanov wrote:
> On 09/30/2014 08:42 PM, riya khanna wrote:
> > What is needed to add support for shared mounts. What could cause
> > checkpointing of shared mounts to fail? Even I'm facing the same
> > issue. Thanks!
> 
> Tycho, I guess these are shared with smth on host, right? I.e.
> the mount points are "external" from CRIU's perspective.

I guess so, although I don't know for sure (maybe Serge knows?). Is
this something that criu can handle with --ext-mount-map? If so,
perhaps we could have lxc-checkpoint detect those somehow and tell
criu.

Tycho

> Thanks,
> Pavel
> 
> > On Thu, Sep 18, 2014 at 11:46 AM, Tycho Andersen
> > <tycho.andersen at canonical.com> wrote:
> >> On Thu, Sep 18, 2014 at 08:22:41PM +0400, Pavel Emelyanov wrote:
> >>> On 09/12/2014 11:31 PM, beproject criu wrote:
> >>>> I am trying to dump LXC container using following command
> >>>>
> >>>> /sdcard # criu dump --root /usr/local/lib/lxc/rootfs/root --evasive-devices --tc
> >>>> p-established --file-locks -n net -n mnt -n ipc -n pid -vvvvvvvv -D data -o dump
> >>>> .log -t 79
> >>>>
> >>>> but i get the following error :
> >>>>
> >>>> Error (mount.c:517): Mount 58 (master_id: 12 shared_id: 0) has unreachable sharing
> >>>
> >>> That's because LXC tools configured shared mountpoints that criu
> >>> doesn't yet support. Can you check with LXC guys what's the preferred
> >>> way of configuring container, they are in progress of integrating criu
> >>> with lxc right now.
> >>
> >> I keep meaning to update the LXC criu wiki page with how to snapshot
> >> using the LXC tools, I will do that today.
> >>
> >> For now, though, as Pavel says shared mounts aren't supported.
> >> lxc-checkpoint should refuse to checkpoint a container if it has an
> >> unsupported configuration.
> >>
> >> Tycho
> >>
> >>>> I have attached the dump.log file with the mail containing full log.
> >>>>
> >>>> Content of mountpoint are:
> >>>>
> >>>> /sdcard # lxc-attach -n L cat /proc/self/mountinfo
> >>>> 16 16 0:2 / / rw - rootfs rootfs rw,size=373304k,nr_inodes=93326
> >>>> 17 16 0:4 / /proc rw,relatime - proc proc rw
> >>>> 18 16 0:11 / /sys rw,relatime - sysfs sysfs rw
> >>>> 19 18 0:12 / /sys/fs/cgroup rw,relatime - cgroup none rw,cpuset,debug,cpu,cpuacct,memory,devices,freezer,blkio,perf_event,clone_children
> >>>> 20 18 0:6 / /sys/kernel/debug rw,relatime - debugfs none rw
> >>>> 21 16 0:10 / /dev/pts rw,relatime - devpts devpts rw,mode=600,ptmxmode=000
> >>>> 22 16 179:0 / /sdcard rw,relatime - ext3 /dev/mmcblk0 rw,data=ordered
> >>>> 24 16 0:2 /usr/local/lib/lxc/rootfs /usr/local/lib/lxc/rootfs rw - rootfs rootfs rw,size=373304k,nr_inodes=93326
> >>>> 25 24 0:14 / /usr/local/lib/lxc/rootfs rw,relatime - tmpfs none rw,size=12k,mode=755
> >>>> 35 25 179:0 /L/rootfs /usr/local/lib/lxc/rootfs/root rw,relatime shared:1 - ext3 /dev/mmcblk0 rw,data=ordered
> >>>> 36 35 0:13 / /usr/local/lib/lxc/rootfs/root/proc rw,relatime shared:2 - proc none rw
> >>>> 37 35 0:15 / /usr/local/lib/lxc/rootfs/root/sys rw,relatime shared:3 - sysfs none rw
> >>>> 26 35 0:16 / /usr/local/lib/lxc/rootfs/root/dev rw,nosuid,relatime shared:6 - tmpfs tmpfs rw,mode=755
> >>>> 27 26 0:10 / /usr/local/lib/lxc/rootfs/root/dev/pts rw,relatime shared:7 - devpts devpts rw,mode=600,ptmxmode=000
> >>>> 28 37 0:6 / /usr/local/lib/lxc/rootfs/root/sys/kernel/debug rw,relatime shared:4 - debugfs debugfs rw
> >>>> 29 37 0:17 / /usr/local/lib/lxc/rootfs/root/sys/fs/cgroup rw,relatime shared:5 - tmpfs none rw,mode=750,gid=1000
> >>>> 30 35 0:18 / /usr/local/lib/lxc/rootfs/root/mnt/asec rw,relatime shared:8 - tmpfs tmpfs rw,mode=755,gid=1000
> >>>> 31 35 0:19 / /usr/local/lib/lxc/rootfs/root/mnt/obb rw,relatime shared:9 - tmpfs tmpfs rw,mode=755,gid=1000
> >>>> 32 35 31:0 / /usr/local/lib/lxc/rootfs/root/system ro,relatime shared:10 - ext4 /dev/block/mtdblock0 ro,data=ordered
> >>>> 33 35 31:1 / /usr/local/lib/lxc/rootfs/root/data rw,nosuid,nodev,noatime shared:11 - ext4 /dev/block/mtdblock1 rw,data=ordered
> >>>> 34 35 31:2 / /usr/local/lib/lxc/rootfs/root/cache rw,nosuid,nodev,noatime shared:12 - yaffs2 /dev/block/mtdblock2 rw
> >>>>
> >>>> Thanks.
> >>>>
> >>>> encl(1).
> >>>>
> >>>>
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