[Bug 1291454] [NEW] spontaneously logged out of lightdm session, authentication failed until logind restarted

[Steve Langasek]

Public bug reported:

Out of nowhere, I was suddenly logged out of my X session today and
dropped to a lightdm greeter screen.  attempts to log back in were
kicked immediately back to the greeter.  A look at the lightdm log
showed:

[+7.44s] DEBUG: Seat: Display server ready, starting session authentication
[+7.44s] DEBUG: Session pid=22931: Started with service 'lightdm-greeter', username 'lightdm'
[+7.55s] DEBUG: Session pid=22931: Authentication complete with return value 0: Success
[+7.55s] DEBUG: Seat: Session authenticated, running command
[+7.55s] DEBUG: Session pid=22931: Running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
[+7.55s] DEBUG: Session pid=22931: Logging to /var/log/lightdm/x-0-greeter.log
[+7.60s] DEBUG: Activating VT 7
[+7.77s] DEBUG: Session pid=22931: Greeter connected version=1.9.8
[+7.96s] DEBUG: Session pid=22931: Greeter start authentication for vorlon
[+7.96s] DEBUG: Session pid=23002: Started with service 'lightdm', username 'vorlon'
[+7.96s] DEBUG: Session pid=22931: Greeter start authentication for vorlon
[+7.96s] DEBUG: Session pid=23002: Sending SIGTERM
[+7.97s] DEBUG: Session pid=23004: Started with service 'lightdm', username 'vorlon'
[+7.97s] DEBUG: Session pid=23002: Terminated with signal 15
[+7.97s] DEBUG: Session: Failed during authentication
[+7.97s] DEBUG: Seat: Session stopped

(you'll note from the timestamps that I had also tried restarting
lightdm, which didn't fix the problem.)

Only after I manually killed logind and restarted lightdm again was I
able to log in.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: systemd-services 204-5ubuntu13
ProcVersionSignature: Ubuntu 3.13.0-12.32-generic 3.13.4
Uname: Linux 3.13.0-12-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Mar 12 08:39:20 2014
InstallationDate: Installed on 2010-09-24 (1265 days ago)
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
SourcePackage: systemd
UpgradeStatus: Upgraded to trusty on 2013-10-23 (140 days ago)

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages trusty

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https://bugs.launchpad.net/bugs/1291454

Title:
  spontaneously logged out of lightdm session, authentication failed
  until logind restarted

Status in “systemd” package in Ubuntu:
  New

Bug description:
  Out of nowhere, I was suddenly logged out of my X session today and
  dropped to a lightdm greeter screen.  attempts to log back in were
  kicked immediately back to the greeter.  A look at the lightdm log
  showed:

  [+7.44s] DEBUG: Seat: Display server ready, starting session authentication
  [+7.44s] DEBUG: Session pid=22931: Started with service 'lightdm-greeter', username 'lightdm'
  [+7.55s] DEBUG: Session pid=22931: Authentication complete with return value 0: Success
  [+7.55s] DEBUG: Seat: Session authenticated, running command
  [+7.55s] DEBUG: Session pid=22931: Running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
  [+7.55s] DEBUG: Session pid=22931: Logging to /var/log/lightdm/x-0-greeter.log
  [+7.60s] DEBUG: Activating VT 7
  [+7.77s] DEBUG: Session pid=22931: Greeter connected version=1.9.8
  [+7.96s] DEBUG: Session pid=22931: Greeter start authentication for vorlon
  [+7.96s] DEBUG: Session pid=23002: Started with service 'lightdm', username 'vorlon'
  [+7.96s] DEBUG: Session pid=22931: Greeter start authentication for vorlon
  [+7.96s] DEBUG: Session pid=23002: Sending SIGTERM
  [+7.97s] DEBUG: Session pid=23004: Started with service 'lightdm', username 'vorlon'
  [+7.97s] DEBUG: Session pid=23002: Terminated with signal 15
  [+7.97s] DEBUG: Session: Failed during authentication
  [+7.97s] DEBUG: Seat: Session stopped

  (you'll note from the timestamps that I had also tried restarting
  lightdm, which didn't fix the problem.)

  Only after I manually killed logind and restarted lightdm again was I
  able to log in.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: systemd-services 204-5ubuntu13
  ProcVersionSignature: Ubuntu 3.13.0-12.32-generic 3.13.4
  Uname: Linux 3.13.0-12-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Mar 12 08:39:20 2014
  InstallationDate: Installed on 2010-09-24 (1265 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  SourcePackage: systemd
  UpgradeStatus: Upgraded to trusty on 2013-10-23 (140 days ago)

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