[Bug 1309025] Re: systemd-logind assert failure: cgmanager-client.c:6322: Assertion failed in cgmanager_list_children_sync: proxy != NULL

[Arthur Azevedo de Amorim]

I started experiencing this error suddenly after a reboot, and couldn't
log in in graphic mode anymore. I promptly found this page and tried to
enable the trusty-proposed repository to install the fixed version.

The first strange thing that I noticed is that I couldn't find a systemd
package in the -proposed package database (Is this normal?). In any
case, I decided to install one by one the components that were mentioned
in the package description. All of them appeared in trusty-proposed, and
I was able to install them.

The problem, however, was that apt said that it needed to remove some
packages that were not compatible with the newer ones that I was
installing. This included things such as Skype, but also others such as
libgl1-mesa-glx. This sounded weird, but I decided to proceed anyway.
After doing that and rebooting, I was able to login without getting the
original error message, but something was still wrong: many of the Unity
components stopped working. The Unity panel is gone, window resizing is
not working, window decorations are gone, etc. I also have XMonad
installed, which seems to work just fine, and also Gnome with XMonad,
with doesn't seem to work at all.

Any ideas on how to fix this?

Thanks

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Title:
  systemd-logind assert failure: cgmanager-client.c:6322: Assertion
  failed in cgmanager_list_children_sync: proxy != NULL

Status in “systemd” package in Ubuntu:
  Fix Released
Status in “systemd” source package in Trusty:
  Fix Committed
Status in “systemd” source package in Utopic:
  Fix Released

Bug description:
  SRU:

  Rationale: systemd-logind randomly crashes on random systems, usually
  with a similar traceback or most commonly with a corrupted one. We've
  identified a few problems in the patch, most of which can account for
  the symptoms people have seen and all of which being obviously correct
  bugfixes.

  Testcase: Get the fixes into utopic and trusty-proposed, wait for a
  week for new reports (here and on errors.ubuntu.com), if none were
  reported, push to -updates. While we know what we've fixed, actually
  reproducing the bug in the wild is notoriously difficult, we attempted
  various kind of stress tests over the past 2 months without much
  luck...

  Regression potential: All the fixes are very simple, very targeted and
  pretty obvious, so if we do end up breaking something else as the
  result of that, it's most likely another bug that was hidden behind
  incorrect behaviour. Any such bug should be easy to deal with or we
  can always revert to the current state (better the devil you know).

  
  === Original bug report ===
  Occurred after a dist-upgrade, reboot and logging in.

  Any needed logs will be added later

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: systemd-services 204-5ubuntu20
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AssertionMessage: cgmanager-client.c:6322: Assertion failed in cgmanager_list_children_sync: proxy != NULL
  Date: Thu Apr 17 14:53:58 2014
  ExecutablePath: /lib/systemd/systemd-logind
  InstallationDate: Installed on 2012-10-08 (555 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20121008)
  ProcCmdline: /lib/systemd/systemd-logind
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
  Signal: 6
  SourcePackage: systemd
  StacktraceTop:
   cgmanager_list_children_sync () from /lib/x86_64-linux-gnu/libcgmanager.so.0
   ?? ()
   ?? ()
   ?? ()
   ?? ()
  Title: systemd-logind assert failure: cgmanager-client.c:6322: Assertion failed in cgmanager_list_children_sync: proxy != NULL
  UpgradeStatus: Upgraded to trusty on 2013-10-26 (172 days ago)
  UserGroups: utah

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