Public bug reported:

It started to happen after I upgraded from  Ubuntu 13.04 to 13.10. Gnome 
freezes (but mouse cursor keeps moving) at least once a day and only Gnome 
restarting helps.
When this happens the following error can be found in the /var/log/syslog:
Nov 6 14:30:41 ayakhno-pc gdm-simple-slave[5992]: GLib-GObject: g_object_ref: 
assertion 'object->ref_count > 0' failed
Nov 6 14:30:41 ayakhno-pc gdm-simple-slave[5992]: Child process 6237 was 
already dead.
Nov 6 14:30:41 ayakhno-pc gdm-simple-slave[5992]: Unable to kill session worker 
process
Nov 6 14:30:41 ayakhno-pc x-session-manager[6251]: Gdk-WARNING: 
x-session-manager: Fatal IO error 11 (Resource temporarily unavailable) on X 
server :0.#012
Nov 6 14:30:41 ayakhno-pc colord: device removed: xrandr-ViewSonic 
Corporation-VA2216w-2-QPD074307128
Nov 6 14:30:41 ayakhno-pc colord: Profile removed: 
icc-45f366c545e2a8173776643f6a68badb
Nov 6 14:30:41 ayakhno-pc kernel: [165579.013252] VirtualBox[22007]: segfault 
at 3fb3ef00 ip 00007f82fabd8021 sp 00007fff83635b90 error 4 in 
libc-2.17.so[7f82fab9c000+1bd000]
Nov 6 14:30:42 ayakhno-pc kernel: [165579.480492] device eth1 left promiscuous 
mode
Nov 6 14:30:42 ayakhno-pc kernel: [165579.500974] vboxnetflt: dropped 319848 
out of 332947 packets
Nov 6 14:30:44 ayakhno-pc gdm-simple-slave[5992]: GLib-GObject: g_object_unref: 
assertion 'object->ref_count > 0' failed
Nov 6 14:30:45 ayakhno-pc pulseaudio[23381]: [pulseaudio] client-conf-x11.c: 
xcb_connection_has_error() returned true
Nov 6 14:30:45 ayakhno-pc pulseaudio[23377]: [pulseaudio] client-conf-x11.c: 
xcb_connection_has_error() returned true
Nov 6 14:30:45 ayakhno-pc pulseaudio[23378]: [pulseaudio] client-conf-x11.c: 
xcb_connection_has_error() returned true
The complete syslog is attached.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xorg 1:7.7+1ubuntu6
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Wed Nov  6 16:35:10 2013
DistUpgraded: 2013-10-23 09:52:45,983 DEBUG enabling apt cron job
DistroCodename: saucy
DistroVariant: ubuntu
DkmsStatus:
 vboxhost, 4.2.18, 3.11.0-12-generic, x86_64: installed
 vboxhost, 4.2.18, 3.8.0-31-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller 
[8086:0162] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Device [1025:0492]
InstallationDate: Installed on 2013-07-08 (121 days ago)
InstallationMedia: Debian GNU/Linux 7.1.0 "Wheezy" - Official amd64 CD Binary-1 
20130615-23:06
MachineType: Acer Aspire XC600
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-12-generic 
root=/dev/mapper/debian--vg-root ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to saucy on 2013-10-23 (14 days ago)
dmi.bios.date: 02/27/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P11-A4L
dmi.board.name: Aspire XC600
dmi.board.vendor: Acer
dmi.board.version: v1.0
dmi.chassis.type: 3
dmi.chassis.vendor: Acer
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP11-A4L:bd02/27/2013:svnAcer:pnAspireXC600:pvr:rvnAcer:rnAspireXC600:rvrv1.0:cvnAcer:ct3:cvr:
dmi.product.name: Aspire XC600
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.46-1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Wed Nov  6 15:05:41 2013
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Video Bus            KEYBOARD, id 7
 input        Power Button         KEYBOARD, id 8
 input        Microsoft Microsoft Basic Optical Mouse MOUSE, id 9
 input        LITEON Technology USB Multimedia Keyboard KEYBOARD, id 10
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               10528
 vendor                                     VSC
xserver.version: 2:1.14.3-3ubuntu2

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


** Tags: amd64 apport-bug saucy ubuntu

** Attachment added: "syslog"
   https://bugs.launchpad.net/bugs/1248568/+attachment/3901540/+files/syslog

** Description changed:

- In started happening after upgrade from  Ubuntu 13.04 to 13.10. Gnome freezes 
(but mouse cursor keeps moving) at least once a day and only Gnome restarting 
helps.
+ It started to happen after I upgraded from  Ubuntu 13.04 to 13.10. Gnome 
freezes (but mouse cursor keeps moving) at least once a day and only Gnome 
restarting helps.
  When this happens the following error can be found in the /var/log/syslog:
  Nov 6 14:30:41 ayakhno-pc gdm-simple-slave[5992]: GLib-GObject: g_object_ref: 
assertion 'object->ref_count > 0' failed
  Nov 6 14:30:41 ayakhno-pc gdm-simple-slave[5992]: Child process 6237 was 
already dead.
  Nov 6 14:30:41 ayakhno-pc gdm-simple-slave[5992]: Unable to kill session 
worker process
  Nov 6 14:30:41 ayakhno-pc x-session-manager[6251]: Gdk-WARNING: 
x-session-manager: Fatal IO error 11 (Resource temporarily unavailable) on X 
server :0.#012
  Nov 6 14:30:41 ayakhno-pc colord: device removed: xrandr-ViewSonic 
Corporation-VA2216w-2-QPD074307128
  Nov 6 14:30:41 ayakhno-pc colord: Profile removed: 
icc-45f366c545e2a8173776643f6a68badb
  Nov 6 14:30:41 ayakhno-pc kernel: [165579.013252] VirtualBox[22007]: segfault 
at 3fb3ef00 ip 00007f82fabd8021 sp 00007fff83635b90 error 4 in 
libc-2.17.so[7f82fab9c000+1bd000]
  Nov 6 14:30:42 ayakhno-pc kernel: [165579.480492] device eth1 left 
promiscuous mode
  Nov 6 14:30:42 ayakhno-pc kernel: [165579.500974] vboxnetflt: dropped 319848 
out of 332947 packets
  Nov 6 14:30:44 ayakhno-pc gdm-simple-slave[5992]: GLib-GObject: 
g_object_unref: assertion 'object->ref_count > 0' failed
  Nov 6 14:30:45 ayakhno-pc pulseaudio[23381]: [pulseaudio] client-conf-x11.c: 
xcb_connection_has_error() returned true
  Nov 6 14:30:45 ayakhno-pc pulseaudio[23377]: [pulseaudio] client-conf-x11.c: 
xcb_connection_has_error() returned true
  Nov 6 14:30:45 ayakhno-pc pulseaudio[23378]: [pulseaudio] client-conf-x11.c: 
xcb_connection_has_error() returned true
  The complete syslog is attached.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: xorg 1:7.7+1ubuntu6
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  .tmp.unity.support.test.0:
-  
+ 
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Wed Nov  6 16:35:10 2013
  DistUpgraded: 2013-10-23 09:52:45,983 DEBUG enabling apt cron job
  DistroCodename: saucy
  DistroVariant: ubuntu
  DkmsStatus:
-  vboxhost, 4.2.18, 3.11.0-12-generic, x86_64: installed
-  vboxhost, 4.2.18, 3.8.0-31-generic, x86_64: installed
+  vboxhost, 4.2.18, 3.11.0-12-generic, x86_64: installed
+  vboxhost, 4.2.18, 3.8.0-31-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
-  Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller 
[8086:0162] (rev 09) (prog-if 00 [VGA controller])
-    Subsystem: Acer Incorporated [ALI] Device [1025:0492]
+  Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller 
[8086:0162] (rev 09) (prog-if 00 [VGA controller])
+    Subsystem: Acer Incorporated [ALI] Device [1025:0492]
  InstallationDate: Installed on 2013-07-08 (121 days ago)
  InstallationMedia: Debian GNU/Linux 7.1.0 "Wheezy" - Official amd64 CD 
Binary-1 20130615-23:06
  MachineType: Acer Aspire XC600
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-12-generic 
root=/dev/mapper/debian--vg-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to saucy on 2013-10-23 (14 days ago)
  dmi.bios.date: 02/27/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P11-A4L
  dmi.board.name: Aspire XC600
  dmi.board.vendor: Acer
  dmi.board.version: v1.0
  dmi.chassis.type: 3
  dmi.chassis.vendor: Acer
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP11-A4L:bd02/27/2013:svnAcer:pnAspireXC600:pvr:rvnAcer:rnAspireXC600:rvrv1.0:cvnAcer:ct3:cvr:
  dmi.product.name: Aspire XC600
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.46-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.9-2ubuntu1
  xserver.bootTime: Wed Nov  6 15:05:41 2013
  xserver.configfile: default
  xserver.devices:
-  input        Power Button         KEYBOARD, id 6
-  input        Video Bus            KEYBOARD, id 7
-  input        Power Button         KEYBOARD, id 8
-  input        Microsoft Microsoft Basic Optical Mouse MOUSE, id 9
-  input        LITEON Technology USB Multimedia Keyboard KEYBOARD, id 10
+  input        Power Button         KEYBOARD, id 6
+  input        Video Bus            KEYBOARD, id 7
+  input        Power Button         KEYBOARD, id 8
+  input        Microsoft Microsoft Basic Optical Mouse MOUSE, id 9
+  input        LITEON Technology USB Multimedia Keyboard KEYBOARD, id 10
  xserver.errors:
-  
+ 
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
-  product id                               10528 
-  vendor                                     VSC
+  product id                               10528
+  vendor                                     VSC
  xserver.version: 2:1.14.3-3ubuntu2

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https://bugs.launchpad.net/bugs/1248568

Title:
  frequent Gnome freeze

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