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System: Ubuntu 14.04, running cinnamon, on a Dell M3800.

The bug happens randomly and logs off the user, who loses everything in the current session.
It happens mostly when a new window is openned, especially terminals (but not only).

>  cat /proc/version_signature 
Ubuntu 3.16.0-41.57~14.04.1-generic 3.16.7-ckt11

The same happens with the latest 3.16.0-43 kernel. Here's what I found
in the Xorg.0.log.old file:

[  1063.253] (EE) Backtrace:
[  1063.254] (EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x7fe8e43aaed8]
[  1063.254] (EE) 1: /usr/bin/X (0x7fe8e4206000+0x1a8f19) [0x7fe8e43aef19]
[  1063.254] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fe8e2385000+0x36d40) [0x7fe8e23bbd40]
[  1063.254] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe8de18b000+0x258f9) [0x7fe8de1b08f9]
[  1063.254] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe8de18b000+0x26d7c) [0x7fe8de1b1d7c]
[  1063.254] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe8de18b000+0xf4f4f) [0x7fe8de27ff4f]
[  1063.254] (EE) 6: /usr/bin/X (0x7fe8e4206000+0x1755bd) [0x7fe8e437b5bd]
[  1063.254] (EE) 7: /usr/bin/X (0x7fe8e4206000+0x176397) [0x7fe8e437c397]
[  1063.255] (EE) 8: /usr/bin/X (DRI2GetBuffersWithFormat+0x10) [0x7fe8e437c770]
[  1063.255] (EE) 9: /usr/bin/X (0x7fe8e4206000+0x178499) [0x7fe8e437e499]
[  1063.255] (EE) 10: /usr/bin/X (0x7fe8e4206000+0x5369e) [0x7fe8e425969e]
[  1063.255] (EE) 11: /usr/bin/X (0x7fe8e4206000+0x574ea) [0x7fe8e425d4ea]
[  1063.255] (EE) 12: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7fe8e23a6ec5]
[  1063.255] (EE) 13: /usr/bin/X (0x7fe8e4206000+0x42a5e) [0x7fe8e4248a5e]
[  1063.255] (EE) 
[  1063.255] (EE) Bus error at address 0x7fe890108000
--- 
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  csoler     7078 F.... pulseaudio
 /dev/snd/controlC0:  csoler     7078 F.... pulseaudio
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=/dev/mapper/swap
InstallationDate: Installed on 2015-06-18 (19 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
MachineType: Dell Inc. Dell Precision M3800
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-41-generic root=UUID=ed58d38e-680c-4454-863d-9c8e4698082c ro quiet splash
ProcVersionSignature: Ubuntu 3.16.0-41.57~14.04.1-generic 3.16.7-ckt11
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.16.0-41-generic N/A
 linux-backports-modules-3.16.0-41-generic  N/A
 linux-firmware                             1.127.12
Tags:  trusty
Uname: Linux 3.16.0-41-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
 
_MarkForUpload: True
dmi.bios.date: 01/08/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: Dell Precision M3800
dmi.board.vendor: Dell Inc.
dmi.board.version: A09
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrA09:bd01/08/2015:svnDellInc.:pnDellPrecisionM3800:pvrA09:rvnDellInc.:rnDellPrecisionM3800:rvrA09:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Dell Precision M3800
dmi.product.version: A09
dmi.sys.vendor: Dell Inc.

** Affects: xorg (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: apport-collected latest-bios-a09 trusty
-- 
XServer crash logs the user off randomly
https://bugs.launchpad.net/bugs/1472471
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