[lxc-users] New live migration issues

[Jamie Brown]

Hello again,

I’m now running LXD 2.0.0 on Ubuntu 16.04 LTS after having some amount of success with a previous BETA on 14.04.

However, after a fresh install, the first attempt at a live migration has failed;

lxc launch ubuntu:xenial host2:migrate
lxc move migrate host3:
error: Error transferring container data: restore failed:
(00.499626)      1: Error (mount.c:2406): mnt: Can't mount at ./sys/kernel/debug: Invalid argument
(00.515123) Error (cr-restore.c:1350): 8965 exited, status=1
(00.573498) Error (cr-restore.c:2182): Restoring FAILED.

The end of the migration log on host3;
(00.499574)      1: mnt: 129:./sys/fs/cgroup/net_cls,net_prio private 1 shared 0 slave 0
(00.499588)      1: mnt:           Mounting securityfs @./sys/kernel/security (0)
(00.499593)      1: mnt:           Bind /sys/kernel/security/ to ./sys/kernel/security
(00.499603)      1: mnt: 276:./sys/kernel/security private 0 shared 0 slave 1
(00.499610)      1: mnt:           Mounting debugfs @./sys/kernel/debug (0)
(00.499615)      1: mnt:           Bind /sys/kernel/debug/ to ./sys/kernel/debug
(00.499626)      1: Error (mount.c:2406): mnt: Can't mount at ./sys/kernel/debug: Invalid argument
(00.515123) Error (cr-restore.c:1350): 8965 exited, status=1
(00.555143) Switching to new ns to clean ghosts
(00.572964) uns: calling exit_usernsd (-1, 1)
(00.573065) uns: daemon calls 0x4523c0 (8960, -1, 1)
(00.573108) uns: `- daemon exits w/ 0
(00.573458) uns: daemon stopped
(00.573498) Error (cr-restore.c:2182): Restoring FAILED.

Both hosts have criu installed and are running the same kernel version (4.4.0-22-generic). The CPU and hardware profile is absolutely identical.

Both hosts are using ZFS file storage.

Stop and copy between hosts works without issue. The criu dump also completes successfully, so the issue appears to be with criu restore.

Any ideas?

Thanks,

Jamie
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