1) Ubuntu 12.04 LTS Beta 2 (nightly build)

2) unity-greeter:  Installiert: 0.2.6-0ubuntu1

This bug occures occasionally when logging out from a sessioin - where NO encfs 
encrypted directory is used. Somehow it's not possible for the greeter to 
access/acknowledge the wallpaper of the user and crashes. The greeter crashes 
ENDLESSLY, until you are quick enough, to press the up-/down arrow on the 
keyboard and switch to the guest session.
If you restart the pc - in the hope, the bug will be gone after restart, you 
land on the same user after the restart - and the greeter goes on crashing, so 
restarting the pc is no solution.

Because you access the users setting from the user directory (I know you
do it, because encfs let's you not acknowledge the users wallpaper - and
change it in the greeter) - and the fact, that this bug crashes the
greeter, you might have a possible security vulnerabillity.

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https://bugs.launchpad.net/bugs/946674

Title:
  unity-greeter crashed with SIGSEGV in background_loader_ready_cb()

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