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[Launchpad Bug Tracker <1351444@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unity-system-compositor -
0.0.4+14.10.20140804-0ubuntu1

---------------
unity-system-compositor (0.0.4+14.10.20140804-0ubuntu1) utopic; urgency=low

  [ Alberto Aguirre ]
  * SessionSwitcher: check if a session is being tracked before
    attempting to remove it (LP: #1351444)
 -- Ubuntu daily release <ps-jenkins@xxxxxxxxxxxxxxxxxxx>   Mon, 04 Aug 2014 15:50:56 +0000

** Changed in: unity-system-compositor (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1351444

Title:
  SessionSwitcher can remove valid sessions from its map since it only
  checks the name

Status in Unity System Compositor:
  In Progress
Status in “unity-system-compositor” package in Ubuntu:
  Fix Released

Bug description:
  SessionSwitcher can remove valid sessions from its map since it only
  checks the name.

  Normally that's ok, except when a session crashes. What can happen is

  Session A with name "session-0" starts, SessionSwitcher registers "session-0" in its internal map.
  At some point this client crashes but it's process has not been killed yet maybe because apport is collecting data so the mir session on the server side is still alive.

  Session B with name also "session-0" starts up and registers with SessionSwitcher.
  SessionSwitcher replaces the entry associated with name "session-0" in its map with the new session pointer.

  Apport finishes up collecting data so the process is now killed. Mir closes SessionA as the process has exited.
  SessionSwitcher is told to remove session name "session-0", which is associated with Sesssion B now (because it does not check the session pointer) so SessionSwitcher decides to show the spinner since the "active" session has been closed.

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