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[Lars W <lars@xxxxxxxxxxxxx>]

I disabled all crypto partition and the problem persists. (I previously
had an encrypted home partition, unlocked with libpam-mount. Now, I used
a new user with no crypto at all.) I also started lightdm-gtk-greeter-
settings to disable the background image and user image, to make the
warnings go away. But the problem still persist. The log still contains
nothing that looks suspicious to me (expect maybe "DEBUG: Got 1
message(s) from PAM" doesn't say which one).

After about 30min of gray screen, I went to terminal and started gdb -p
$pid, where $pid is the process id of the 100% CPU process lightdm-gtk-
greeter, to attach a debugging session and see where the process hangs.
Interestingly, after ~20 debug steps, it runs again and waits for user
input. I go back to Ctrl+Alt+F8, and can log in again! (what the...?)

After login, I see a prompt for authentification with
org.freedesktop.accounts.change-own-user-data . Maybe it is related to
that?

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greeter in Ubuntu.
https://bugs.launchpad.net/bugs/1495030

Title:
  lightdm-gtk-greeter hangs, leaving session locked with gray screen

Status in lightdm-gtk-greeter package in Ubuntu:
  New

Bug description:
  On a fresh Xubuntu 15.04 install, I created a new user. When I lock
  the session (or resume from standby, which also locks the session), I
  see nothing but a screen in light gray. After about a minnute, the
  screen goes black (power safe), pressing any key brings back the gray
  screen. There is no possibility to unlock the session. Ctrl+Alt+F1
  brings me to terminal, where I can see with `top` that "lightdm-gtk-
  greeter" takes 100% CPU.

  The log contains warnings about background images that can not be
  read. I believe those are warnings only and not fatal errors.

  Version of lightdm-gtk-greeter: 2.0.0-0ubuntu1.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: lightdm 1.14.2-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
  Uname: Linux 3.19.0-28-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.4
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Sep 12 10:02:29 2015
  InstallationDate: Installed on 2015-09-03 (8 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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