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[Cyril Soler <1472471@xxxxxxxxxxxxxxxxxx>]

I could not reproduce that bug using the live CD for 1 hour. Given that
I'm not using unity, given that the bug happens in a way that is very
unpredictable (sometimes 2-3 times in a row in 10 minutes, then nothing
for several days), this does not mean that this bug is fixed. I'm not
even sure that the live CD uses the same driver (intel_drv) which seems
responsible for the crash.

That bug happened to me once again 1 hour ago (exact same callstack).

Being myself a developer, I can if you indicate me how, install debug
symbols for that module (does this exist?) and give you more info. From
my experience, a bug like this seems to depend on some unitialized
variable which value depends on what's in the graphics memory at the
time of use.

Is there a way not to use intel_drv?

thx for the help

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https://bugs.launchpad.net/bugs/1472471

Title:
  XServer crash logs the user off randomly

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  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.

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