Comment 11 for bug 1580765

That sounds a plausible reason. Preventing change of target name when migrating a running container would be a reasonable temporary solution.

So I retried, this time keeping the target container name the same. However it failed again, but with a different error:

root@nuc1:~# lxc move sample nuc2:sample
error: Error transferring container data: restore failed:
(00.213976) 1: Error (mount.c:2406): mnt: Can't mount at ./sys/kernel/debug: Invalid argument
(00.229795) Error (cr-restore.c:1352): 4333 killed by signal 9
(00.272166) Error (cr-restore.c:2182): Restoring FAILED.

Running again with inotifywait on the target:

root@nuc2:~# inotifywait -mr /var/lib/lxd/shmounts
Setting up watches. Beware: since -r was given, this may take a while!
Watches established.
/var/lib/lxd/shmounts/ CREATE,ISDIR sample
/var/lib/lxd/shmounts/ OPEN,ISDIR sample
/var/lib/lxd/shmounts/ ACCESS,ISDIR sample
/var/lib/lxd/shmounts/ CLOSE_NOWRITE,CLOSE,ISDIR sample
/var/lib/lxd/shmounts/sample/ DELETE_SELF
/var/lib/lxd/shmounts/ DELETE,ISDIR sample

Let me know if you want this opening as a separate issue.