This is very likely not a LXD bug. I suspect this is https://github.com/zfsonlinux/zfs/issues/5796 again which I reported to ZFS upstream. I'll ping them about this again tomorrow and if I don't hear back will take a look at this myself.
** Bug watch added: Github Issue Tracker for ZFS #5796 https://github.com/zfsonlinux/zfs/issues/5796 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lxc in Ubuntu. https://bugs.launchpad.net/bugs/1686036 Title: strange behavior after restore snapshot Status in lxc package in Ubuntu: New Bug description: uname -a Linux lxd2-chel1 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux lxd: 2.12-0ubuntu3~ubuntu16.04.1~ppa1 zfsutils-linux: 0.6.5.6-0ubuntu16 # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.2 LTS Release: 16.04 Codename: xenial after restore container from shapshot cannot add new snapshot or restore again until restart container example: # lxc image list +---------------+--------------+--------+--------------------------------------+--------+---------+------------------------------+ | ALIAS | FINGERPRINT | PUBLIC | DESCRIPTION | ARCH | SIZE | UPLOAD DATE | +---------------+--------------+--------+--------------------------------------+--------+---------+------------------------------+ | debian/jessie | ba43812c4cb9 | no | Debian jessie amd64 (20170423_22:42) | x86_64 | 94.14MB | Apr 24, 2017 at 9:07am (UTC) | +---------------+--------------+--------+--------------------------------------+--------+---------+------------------------------+ # lxc launch debian/jessie Creating popular-kitten The container you are starting doesn't have any network attached to it. To create a new network, use: lxc network create To attach a network to a container, use: lxc network attach Starting popular-kitten # lxc info popular-kitten Name: popular-kitten Remote: unix:/var/lib/lxd/unix.socket Architecture: x86_64 Created: 2017/04/25 07:17 UTC Status: Running Type: persistent Profiles: default Pid: 6965 Ips: lo: inet 127.0.0.1 lo: inet6 ::1 Resources: Processes: 7 Disk usage: root: 1.48MB CPU usage: CPU usage (in seconds): 25 Memory usage: Memory (current): 16.22MB Memory (peak): 23.01MB Network usage: lo: Bytes received: 0B Bytes sent: 0B Packets received: 0 Packets sent: 0 # lxc profile show default config: {} description: Default LXD profile devices: root: path: / pool: main-pool type: disk name: default used_by: - /1.0/containers/popular-kitten # lxc snapshot popular-kitten # zfs get mounted main-pool/containers/popular-kitten NAME PROPERTY VALUE SOURCE main-pool/containers/popular-kitten mounted yes - # zfs get mounted main-pool/snapshots/popular-kitten NAME PROPERTY VALUE SOURCE main-pool/snapshots/popular-kitten mounted yes - # lxc restore popular-kitten snap0 # zfs get mounted main-pool/snapshots/popular-kitten NAME PROPERTY VALUE SOURCE main-pool/snapshots/popular-kitten mounted yes - # zfs get mounted main-pool/containers/popular-kitten NAME PROPERTY VALUE SOURCE main-pool/containers/popular-kitten mounted no - # lxc snapshot popular-kitten error: Failed to mount ZFS filesystem: filesystem 'main-pool/containers/popular-kitten' is already mounted cannot mount 'main-pool/containers/popular-kitten': mountpoint or dataset is busy # lxc restore popular-kitten snap0 error: Failed to mount ZFS filesystem: filesystem 'main-pool/containers/popular-kitten' is already mounted cannot mount 'main-pool/containers/popular-kitten': mountpoint or dataset is busy but container still work: # lxc info popular-kitten Name: popular-kitten Remote: unix:/var/lib/lxd/unix.socket Architecture: x86_64 Created: 2017/04/25 07:17 UTC Status: Running ... # lxc exec popular-kitten bash root@popular-kitten:~# uptime 07:34:06 up 8 min, 0 users, load average: 0.00, 0.02, 0.03 after restart container: # lxc restart popular-kitten # zfs get mounted main-pool/containers/popular-kitten NAME PROPERTY VALUE SOURCE main-pool/containers/popular-kitten mounted yes - on another server this problem missmatch: # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.10 Release: 16.10 Codename: yakkety # lxd --version 2.4.1 zfsutils-linux: 0.6.5.8-0ubuntu4.1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1686036/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
