[CRIU] LXC DUMP ERROR

[Tycho Andersen]

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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> > 
> 
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