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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

** Affects: lightdm
     Importance: Undecided
         Status: Confirmed

** Affects: xorg-server (Ubuntu)
     Importance: Critical
         Status: Triaged


** Tags: apport-collected bios-outdated-43 compiz-0.9 ubuntu wily
-- 
lightdm crashes on window open in Ubuntu 15.10 intel
https://bugs.launchpad.net/bugs/1509846
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