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[Ryan <mail@xxxxxxxxxxxxxxxxxx>]

In my case Chrome causes the crashes, mostly when I open a new tab.
Starting Chrome with parameter --disable-gpu seems to prevent them (but
rendering is much slower).

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https://bugs.launchpad.net/bugs/1509846

Title:
  lightdm crashes on window open in Ubuntu 15.10 intel

Status in lightdm package in Ubuntu:
  Confirmed

Bug description:
  Symptom: xorg crashes on windows creation

  How to reproduce: No 100% reproducibility, however intensively using
  2D/3D acceleration triggers the bug (e.g. by opening several new
  windows and/or menus in a Unity desktop environment)

  Affected hardware: Intel HD Graphics 4400/5000 etc
  Affected software:
  - kernel 4.2.0-16-generic #19-Ubuntu SMP Thu Oct 8 15:35:06 UTC 2015 x86_64
  - Ubuntu 15.10 with Unity (because of compiz 2D/3D acceleration)
  - any other software using direct rendering (e.g. VLC)

  Workaround:
  - Disable window animations in Compiz reduces the frequency of the crashes.
  Use compizconfig-settings-manager for this tweak (sudo apt-get install compizconfig-settings-manager)

  
  [original description below]

  I get crashes, when I open a new window in an already started
  application. It happens irregularely, but I can force the crash if I
  open several new message windows in thunderbird. But it also happens
  in other applilcations, for example a new terminal window.

  This is the output during the crash in /var/log/Xorg.0.log
  [   253.500] (EE)
  [   253.500] (EE) Backtrace:
  [   253.500] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55f09075b62e]
  [   253.500] (EE) 1: /usr/bin/X (0x55f0905a7000+0x1b8999) [0x55f09075f999]
  [   253.500] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f44130a8000+0x352f0) [0x7f44130dd2f0]
  [   253.500] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x24f18) [0x7f440f4a3f18]
  [   253.500] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x26157) [0x7f440f4a5157]
  [   253.500] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x2b4b1) [0x7f440f4aa4b1]
  [   253.500] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x804e4) [0x7f440f4ff4e4]
  [   253.501] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x80e2c) [0x7f440f4ffe2c]
  [   253.501] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x82e1a) [0x7f440f501e1a]
  [   253.501] (EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x4197c) [0x7f440f4c097c]
  [   253.501] (EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x59906) [0x7f440f4d8906]
  [   253.501] (EE) 11: /usr/bin/X (_CallCallbacks+0x34) [0x55f090604654]
  [   253.501] (EE) 12: /usr/bin/X (WriteToClient+0x244) [0x55f09075f274]
  [   253.501] (EE) 13: /usr/bin/X (WriteEventsToClient+0x1e2) [0x55f09060a502]
  [   253.501] (EE) 14: /usr/bin/X (0x55f0905a7000+0xf495a) [0x55f09069b95a]
  [   253.501] (EE) 15: /usr/bin/X (0x55f0905a7000+0xf5ef5) [0x55f09069cef5]
  [   253.501] (EE) 16: /usr/bin/X (0x55f0905a7000+0x5818f) [0x55f0905ff18f]
  [   253.501] (EE) 17: /usr/bin/X (0x55f0905a7000+0x5c34b) [0x55f09060334b]
  [   253.501] (EE) 18: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f44130c8a40]
  [   253.501] (EE) 19: /usr/bin/X (_start+0x29) [0x55f0905ed6c9]
  [   253.501] (EE)
  [   253.501] (EE) Segmentation fault at address 0x0
  [   253.501] (EE)
  Fatal server error:
  [   253.501] (EE) Caught signal 11 (Segmentation fault). Server aborting
  [   253.501] (EE)
  [   253.501] (EE)
  Please consult the The X.Org Foundation support
           at http://wiki.x.org
   for help.
  [   253.501] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
  [   253.502] (EE)
  [   253.502] (II) AIGLX: Suspending AIGLX clients for VT switch
  [   253.588] (EE) Server terminated with error (1). Closing log file.
  ---
  .tmp.unity.support.test.0:

  ApportVersion: 2.19.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroRelease: Ubuntu 15.10
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 5.0.4, 4.2.0-11-generic, x86_64: installed
   virtualbox, 5.0.4, 4.2.0-16-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:3978]
  InstallationDate: Installed on 2015-10-20 (6 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
  MachineType: LENOVO 20266
  Package: xorg 1:7.7+7ubuntu4
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic.efi.signed root=UUID=a2970568-5fac-4c99-bbdf-be6778ae16d2 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Tags:  wily ubuntu compiz-0.9
  UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev'
  Uname: Linux 4.2.0-16-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 09/17/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 76CN27WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Yoga2
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058STD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga 2 Pro
  dmi.modalias: dmi:bvnLENOVO:bvr76CN27WW:bd09/17/2013:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro:
  dmi.product.name: 20266
  dmi.product.version: Lenovo Yoga 2 Pro
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Tue Oct 27 02:25:28 2015
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               16970
   vendor                                     SDC
  xserver.version: 2:1.17.2-1ubuntu9

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