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[Stéphane Graber <stgraber@xxxxxxxxxxxx>]

** Changed in: lxd (Ubuntu Xenial)
       Status: Triaged => Fix Released

** No longer affects: lxd (Ubuntu Yakkety)

** Changed in: lxd (Ubuntu Zesty)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1686036

Title:
  mountpoint remains in use after restore snapshot

Status in lxd package in Ubuntu:
  Fix Released
Status in lxd source package in Xenial:
  Fix Released
Status in lxd source package in Zesty:
  Fix Released
Status in lxd source package in Artful:
  Fix Released

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

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