I now have this issue, I have noticed that is only occuring with the
Google Chrome/Chromium packages. I also noticed that this error resets
Xorg. I have included the Xorg.0.log file where the Seg Fault is.

OS : Ubuntu 12.04
Video Driver : NVidia version 319 (Recommended / Stable)
CPU : 8 Core Dual Intel(R) Xeon(R) CPU           E5506  @ 2.13GHz
Memory : 16 G


To replicate this error / known bug; simply log in, and start google chrome or 
chromium, count 2 or 3 seconds and whamo, seg fault.

[Begin Xorg Output]

[  3260.021] (II) NVIDIA(GPU-0):     Vision stereo.
[  3260.021] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID 
for display
[  3260.021] (**) NVIDIA(0):     device DELL E176FP (CRT-1) (Using EDID 
frequencies has
[  3260.021] (**) NVIDIA(0):     been enabled on all display devices.)
[  3260.102] (II) XKB: reuse xkmfile 
/var/lib/xkb/server-03AF3717FF3AB439A4BAABA686CCB40771CDF520.xkm
[  3280.265] (II) NVIDIA(GPU-0): Display (DELL E176FP (CRT-0)) does not support 
NVIDIA 3D
[  3280.265] (II) NVIDIA(GPU-0):     Vision stereo.
[  3280.265] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID 
for display
[  3280.265] (**) NVIDIA(0):     device DELL E176FP (CRT-0) (Using EDID 
frequencies has
[  3280.265] (**) NVIDIA(0):     been enabled on all display devices.)
[  3280.281] (II) NVIDIA(GPU-0): Display (DELL E176FP (CRT-1)) does not support 
NVIDIA 3D
[  3280.281] (II) NVIDIA(GPU-0):     Vision stereo.
[  3280.281] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID 
for display
[  3280.281] (**) NVIDIA(0):     device DELL E176FP (CRT-1) (Using EDID 
frequencies has
[  3280.281] (**) NVIDIA(0):     been enabled on all display devices.)
[  3942.556] 
Backtrace:
[  3942.557] 0: /usr/bin/X (xorg_backtrace+0x26) [0x7f5f3648ba86]
[  3942.557] 1: /usr/bin/X (0x7f5f36303000+0x18c92a) [0x7f5f3648f92a]
[  3942.557] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f5f35629000+0xfcb0) 
[0x7f5f35638cb0]
[  3942.557] Segmentation fault at address (nil)
[  3942.557] 
Caught signal 11 (Segmentation fault). Server aborting
[  3942.557] 
Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
[  3942.557] Please also check the log file at "/var/log/Xorg.0.log" for 
additional information.
[  3942.557] 
[  3942.684] (II) evdev: Power Button: Close
[  3942.684] (II) UnloadModule: "evdev"
[  3942.684] (II) Unloading evdev
[  3942.764] (II) evdev: Power Button: Close
[  3942.764] (II) UnloadModule: "evdev"
[  3942.764] (II) Unloading evdev
[  3942.764] (II) evdev: USB2.0 PC CAMERA: Close
[  3942.764] (II) UnloadModule: "evdev"
[  3942.764] (II) Unloading evdev

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https://bugs.launchpad.net/bugs/980519

Title:
  Random log off in Ubuntu 12.04 LTS

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