[Bug 1533833] Re: unprivileged lxc containers won't start, need to put sessions into "pids" cgroup controller

[Bas Zoetekouw]

I've downgraded systemd to 225-1ubuntu9.1 from wily/proposed.  Kernel is
still linux-image-4.5.0-040500rc4-generic and lxc is
1.1.5-0ubuntu0.15.10.3 from wily-updates.

Unfortunately, when I now start the lxc container, I seem to hit a
different bug.  I get:

      lxc-start 1455870309.289 INFO     lxc_conf - conf.c:setup_tty:1080 - 4 tty(s) has been setup
      lxc-start 1455870309.289 INFO     lxc_conf - conf.c:setup_personality:1473 - set personality to '0x0'
      lxc-start 1455870309.289 DEBUG    lxc_conf - conf.c:setup_caps:2279 - drop capability 'mac_admin' (33)
      lxc-start 1455870309.289 DEBUG    lxc_conf - conf.c:setup_caps:2279 - drop capability 'mac_override' (32)
      lxc-start 1455870309.289 DEBUG    lxc_conf - conf.c:setup_caps:2279 - drop capability 'sys_time' (25)
      lxc-start 1455870309.289 DEBUG    lxc_conf - conf.c:setup_caps:2279 - drop capability 'sys_module' (16)
      lxc-start 1455870309.289 DEBUG    lxc_conf - conf.c:setup_caps:2288 - capabilities have been setup
      lxc-start 1455870309.289 NOTICE   lxc_conf - conf.c:lxc_setup:4026 - 'aansluitform-deploy' is setup.
      lxc-start 1455870309.289 WARN     lxc_apparmor - lsm/apparmor.c:apparmor_process_label_set:167 - Incomplete AppArmor support in your kernel
      lxc-start 1455870309.289 ERROR    lxc_apparmor - lsm/apparmor.c:apparmor_process_label_set:169 - If you really want to start this container, set
      lxc-start 1455870309.289 ERROR    lxc_apparmor - lsm/apparmor.c:apparmor_process_label_set:170 - lxc.aa_allow_incomplete = 1
      lxc-start 1455870309.289 ERROR    lxc_apparmor - lsm/apparmor.c:apparmor_process_label_set:171 - in your container configuration file
      lxc-start 1455870309.289 ERROR    lxc_sync - sync.c:__sync_wait:51 - invalid sequence number 1. expected 4
      lxc-start 1455870309.289 ERROR    lxc_start - start.c:__lxc_start:1213 - failed to spawn 'aansluitform-deploy'
      lxc-start 1455870309.290 ERROR    lxc_cgmanager - cgmanager.c:cgm_remove_cgroup:523 - call to cgmanager_remove_sync failed: invalid request
      lxc-start 1455870309.290 ERROR    lxc_cgmanager - cgmanager.c:cgm_remove_cgroup:525 - Error removing all:lxc/aansluitform-deploy-8
      lxc-start 1455870309.317 WARN     lxc_commands - commands.c:lxc_cmd_rsp_recv:172 - command get_init_pid failed to receive response
      lxc-start 1455870309.317 WARN     lxc_cgmanager - cgmanager.c:cgm_get:994 - do_cgm_get exited with error
      lxc-start 1455870314.321 ERROR    lxc_start_ui - lxc_start.c:main:344 - The container failed to start.
lxc-start: lxc_start.c: main: 344 The container failed to start.
      lxc-start 1455870314.321 ERROR    lxc_start_ui - lxc_start.c:main:346 - To get more details, run the container in foreground mode.
lxc-start: lxc_start.c: main: 346 To get more details, run the container in foreground mode.
      lxc-start 1455870314.321 ERROR    lxc_start_ui - lxc_start.c:main:348 - Additional information can be obtained by setting the --logfile and --logpriority options.
lxc-start: lxc_start.c: main: 348 Additional information can be obtained by setting the --logfile and --logpriority options.                                             


When adding the suggested apparmor parameter to the config file, the apparmor error disappear, but the cgmanager errors are identical (but different than before)...
Any ideas?

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https://bugs.launchpad.net/bugs/1533833

Title:
  unprivileged lxc containers won't start, need to put sessions into
  "pids"  cgroup controller

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