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[Stéphane Graber <stgraber@xxxxxxxxxxxx>]

The verification of the Stable Release Update for lxc has completed
successfully and the package has now been released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1497420

Title:
  systemd 226 (moving pid 1 into /init.scope cgroup) breaks lxc-attach

Status in cgmanager package in Ubuntu:
  Fix Released
Status in lxc package in Ubuntu:
  Fix Released
Status in lxcfs package in Ubuntu:
  Fix Released
Status in cgmanager source package in Vivid:
  New
Status in lxc source package in Vivid:
  Fix Released
Status in lxcfs source package in Vivid:
  New
Status in cgmanager source package in Wily:
  New
Status in lxc source package in Wily:
  Fix Released
Status in lxcfs source package in Wily:
  New
Status in docker package in Debian:
  Fix Released

Bug description:
  Once systemd 226 is installed in an unprivileged Debian Sid container,
  lxc-attach no-longer functions:

  % lxc-attach -n siddy
  lxc-attach: cgmanager.c: lxc_cgmanager_enter: 698 call to cgmanager_move_pid_abs_sync failed: invalid request
  lxc-attach: cgmanager.c: cgm_attach: 1460 Failed to enter group /user.slice/user-1000.slice/session-1.scope/lxc/siddy/init.scope
  lxc-attach: attach.c: lxc_attach: 909 error communicating with child process

  % journalctl -u cgmanager | tail -n 1
  Sep 18 20:20:44 astoria cgmanager[1169]: cgmanager:per_ctrl_move_pid_main: pid 21918 (uid 1000 gid 1000) may not write to /run/cgmanager/fs/none,name=systemd//user.slice/user-1000.slice/session-1.scope/lxc/siddy/init.scope/tasks

  
  Full walkthrough:

  % lxc-create -n siddy -t download -- -d debian -r sid -a amd64
  Using image from local cache
  Unpacking the rootfs
  ...

  % lxc-start -n siddy
  % lxc-attach -n siddy

  root@siddy:/# apt-get update
  Get:1 http://http.debian.net sid InRelease [253 kB]
  ...
  Get:7 http://http.debian.net sid/non-free amd64 Packages [91.3 kB]                                                            
  Fetched 13.2 MB in 3s (3789 kB/s)                                                  
  Reading package lists... Done

  
  root@siddy:/# apt-get install systemd
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  The following extra packages will be installed:
    libsystemd0
  Suggested packages:
    systemd-ui systemd-container
  Recommended packages:
    libpam-systemd dbus
  The following packages will be upgraded:
    libsystemd0 systemd
  2 upgraded, 0 newly installed, 0 to remove and 47 not upgraded.
  Need to get 3668 kB of archives.
  After this operation, 1100 kB disk space will be freed.
  Do you want to continue? [Y/n] 
  Get:1 http://http.debian.net/debian/ sid/main libsystemd0 amd64 226-2 [242 kB]
  Get:2 http://http.debian.net/debian/ sid/main systemd amd64 226-2 [3426 kB]
  ...
  Setting up systemd (226-2) ...
  Installing new version of config file /etc/X11/xinit/xinitrc.d/50-systemd-user.sh ...
  Installing new version of config file /etc/dbus-1/system.d/org.freedesktop.login1.conf ...
  addgroup: The group `systemd-journal' already exists as a system group. Exiting.
  Failed to set capabilities on file `/usr/bin/systemd-detect-virt' (Invalid argument)
  The value of the capability argument is not permitted for a file. Or the file is not a regular (non-symlink) file
  Failed to execute operation: File exists
  Removing obsolete conffile /etc/dbus-1/system.d/org.freedesktop.machine1.conf ...

  root@siddy:/# exit

  % lxc-attach -n siddy
  lxc-attach: cgmanager.c: lxc_cgmanager_enter: 698 call to cgmanager_move_pid_abs_sync failed: invalid request
  lxc-attach: cgmanager.c: cgm_attach: 1460 Failed to enter group /user.slice/user-1000.slice/session-1.scope/lxc/siddy/init.scope
  lxc-attach: attach.c: lxc_attach: 909 error communicating with child process

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: lxc 1.1.3-0ubuntu1 [modified: usr/lib/x86_64-linux-gnu/lxc/lxc-net]
  ProcVersionSignature: Ubuntu 4.2.0-10.11-generic 4.2.0
  Uname: Linux 4.2.0-10-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.18.1-0ubuntu1
  Architecture: amd64
  Date: Fri Sep 18 20:19:58 2015
  SourcePackage: lxc
  UpgradeStatus: Upgraded to wily on 2015-08-28 (20 days ago)
  defaults.conf:
   lxc.network.type = veth
   lxc.network.link = lxcbr0
   lxc.network.flags = up
   lxc.network.hwaddr = 00:16:3e:xx:xx:xx

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