Public bug reported:

Starting certain applications has the gnome session log out randomly back to 
the login screen.
Logging into same user account starts a new session, previous session not kept.

Applications noticed;
* Virtual Machine Manager
* Oracle VM VirtualBox
* Ark

Error noticed in sysvarlog is:
Jun 30 15:11:17 ubuntu-desktop gnome-session[8042]: Gdk-WARNING: gnome-session: 
Fatal IO error 11 (Resource temporarily unavailable) on X server :2.#012

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  302.17  Tue Jun 12 16:03:22 
PDT 2012
 GCC version:  gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
.proc.driver.nvidia.warnings.fbdev:
 Your system is not currently configured to drive a VGA console
 on the primary VGA device. The NVIDIA Linux graphics driver
 requires the use of a text-mode VGA console. Use of other console
 drivers including, but not limited to, vesafb, may result in
 corruption and stability problems, and is not supported.
.tmp.unity.support.test.0:
 
ApportVersion: 2.0.1-0ubuntu10
Architecture: amd64
CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,mousepoll,vpswitch,gnomecompat,wall,imgpng,resize,place,unitymtgrabhandles,widget,commands,grid,move,regex,snap,obs,session,animation,workarounds,fade,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
Date: Sat Jun 30 15:27:28 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 NVIDIA Corporation G84 [GeForce 8600 GT] [10de:0402] (rev a1) (prog-if 00 [VGA 
controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:825c]
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
JockeyStatus:
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, 
Enabled, In use)
 xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release 
updates) (Proprietary, Disabled, Not in use)
MachineType: Gigabyte Technology Co., Ltd. P35-DS3R
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-26-generic 
root=UUID=85ed314f-a6c2-432d-bfd1-a7cb2c1b0fd7 ro ipv6.disable=1 quiet splash 
pci=use_crs vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/10/2008
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F12
dmi.board.name: P35-DS3R
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF12:bd07/10/2008:svnGigabyteTechnologyCo.,Ltd.:pnP35-DS3R:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP35-DS3R:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: P35-DS3R
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.7.8-0ubuntu1.1
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.19.0-0ubuntu1~xup1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 possible-manual-nvidia-install precise 
third-party-packages ubuntu

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https://bugs.launchpad.net/bugs/1019500

Title:
  gnome-session: Gdk-WARNING: gnome-session: Fatal IO error 11 (resource
  temporarily unavailable) on X server

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