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[david <david_ubuntu@xxxxxxxxxxxxx>]

*** Hi there, I seem to have found resolution on this very frustrating
bug.

I've been going on 3 days now without a single crash, and that is with
trying to instigate it with all the usual things (mostly Thunderbird
opening a window)

Note that I have NOT used any other workarounds (like animation disabling, GDM instead of lightdb, switch to xubuntu etc)
Switching to xubuntu/kubuntu/whatever was not an option for me.

It resolved by proceeding to follow these steps given above by
Christopher M. Penalver (penalvch) wrote on 2015-10-30:  #43

 (I've pasted his note below)  (doing a dist-upgrade instead of just the
usual upgrade seemed to do the trick):

Please follow these instructions to have apport report a new bug about your crash that can be dealt with by the automatic retracer. First, execute at a terminal:
cd /var/crash && sudo rm * ; sudo apt-get update && sudo apt-get -y dist-upgrade && sudo service apport start force_start=1

If you are running the Ubuntu Stable Release you might need to enable
apport in /etc/default/apport and restart.

Now reproduce the crash, then open a terminal, navigate to your /var/crash directory and file your report with:
sudo ubuntu-bug /var/crash/_my_crash_report.crash

where _my_crash_report.crash is the crash you would like to report. By
default, this sends the crash to the Ubuntu Error Tracker
infrastructure, which is different than Launchpad. For more on this,
please see https://wiki.ubuntu.com/ErrorTracker .

However, if after doing this you would still like to have a crash report posted to Launchpad, for example to ease triage and add others to your report, one would need to open the following file via a terminal:
sudo nano /etc/apport/crashdb.conf

and comment out the line:
'problem_types': ['Bug', 'Package'],

by changing it to:
# 'problem_types': ['Bug', 'Package'],

Save, close, and file the crash report via:
sudo ubuntu-bug /var/crash/_my_crash_report.crash

If you do open this report, please feel free to subscribe me to it.

However, I'm closing this report since the process outlined above will
deal with this issue more efficiently. Also, please do not attach your
crash report manually to this report and reopen it. Thank you for your
understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
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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