I have the same issue on a fresh installed Ubuntu-16.04 VM on OpenStack,
but not in a VM on Citrix XenCenter. Are there some depedencies from the
hypervisor?

criu 2.0-2ubuntu3 amd64
lxd  2.0.0-0ubuntu4 amd64
lxd-client 2.0.0-0ubuntu4 amd64 

snapshot_dump.log:

Error (cr-dump.c:1600): Dumping FAILED.

lxc.log:

            lxc 20160508091123.039 INFO     lxc_criu - criu.c:exec_criu:392 - 
execing: /usr/sbin/criu dump --tcp-established --file-locks --link-remap 
--force-irmap --manage-cgroups --ext-mount-map auto --enable-external-sharing 
--enable-external-masters --enable-fs hugetlbfs --enable-fs tracefs -D 
/var/lib/lxd/containers/c1/rootfs/state -o 
/var/lib/lxd/containers/c1/rootfs/state/dump.log -vvvvvv -t 6418 
--freeze-cgroup /sys/fs/cgroup/freezer///lxc/c1 --ext-mount-map 
/dev/console:console --external tty[880
            lxc 20160508091123.041 DEBUG    lxc_commands - 
commands.c:lxc_cmd_handler:893 - peer has disconnected
            lxc 20160508091123.074 ERROR    lxc_criu - criu.c:do_dump:879 - 
dump failed with 1

When I enter this manually, I get the message:
Error (image.c:404): Can't open dir /var/lib/lxd/containers/c1/rootfs/state: No 
such file or directory

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https://bugs.launchpad.net/bugs/1569679

Title:
  lxc failed to do lxc-checkpoint again

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