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["David N. Welton" <davidnwelton@xxxxxxxxx>]

I have a very similar crash:

[ 10893.990] (EE) Backtrace:
[ 10893.990] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x557a5e41768e]
[ 10893.990] (EE) 1: /usr/bin/X (0x557a5e263000+0x1b89f9) [0x557a5e41b9f9]
[ 10893.990] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fb5b677a000+0x352f0) [0x7fb5b67af2f0]
[ 10893.990] (EE) 3: /usr/bin/X (WriteEventsToClient+0x3a) [0x557a5e2c635a]
[ 10893.990] (EE) 4: /usr/bin/X (0x557a5e263000+0x187cd8) [0x557a5e3eacd8]
[ 10893.990] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fb5b2b51000+0x85db3) [0x7fb5b2bd6db3]
[ 10893.990] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fb5b2b51000+0x8a5a2) [0x7fb5b2bdb5a2]
[ 10893.990] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fb5b2b51000+0x1020af) [0x7fb5b2c530af]
[ 10893.990] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fb5b2b51000+0x10469f) [0x7fb5b2c5569f]
[ 10893.990] (EE) 9: /usr/bin/X (0x557a5e263000+0x185c2c) [0x557a5e3e8c2c]
[ 10893.990] (EE) 10: /usr/bin/X (DRI2CopyRegion+0x8e) [0x557a5e3e934e]
[ 10893.991] (EE) 11: /usr/bin/X (0x557a5e263000+0x188723) [0x557a5e3eb723]
[ 10893.991] (EE) 12: /usr/bin/X (0x557a5e263000+0x5818f) [0x557a5e2bb18f]
[ 10893.991] (EE) 13: /usr/bin/X (0x557a5e263000+0x5c34b) [0x557a5e2bf34b]
[ 10893.991] (EE) 14: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7fb5b679aa40]
[ 10893.991] (EE) 15: /usr/bin/X (_start+0x29) [0x557a5e2a96c9]
[ 10893.991] (EE) 
[ 10893.991] (EE) Segmentation fault at address 0xc98


I added the workaround referenced in the other bug, and will see how that goes.  It does slow things down, although now I have also disabled compositing in XFCE4.

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https://bugs.launchpad.net/bugs/1510998

Title:
  Xorg crashes with segfault on 15.10

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  I updated my system from 15.04 to 15.10 yesterday. Since then the X
  server has already crashed 5 times, which renders the system close to
  unusable for me.

  The corresponding messages in Xorg.0.log.old are:
  [ 12125.023] (EE)
  [ 12125.023] (EE) Backtrace:
  [ 12125.023] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55953d82762e]
  [ 12125.023] (EE) 1: /usr/bin/X (0x55953d673000+0x1b8999) [0x55953d82b999]
  [ 12125.023] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f7c10e7b000+0x352f0) [0x7f7c10eb02f0]
  [ 12125.023] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f7c0d252000+0x24edc) [0x7f7c0d276edc]
  [ 12125.023] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f7c0d252000+0x26157) [0x7f7c0d278157]
  [ 12125.023] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f7c0d252000+0x4a1e8) [0x7f7c0d29c1e8]
  [ 12125.023] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f7c0d252000+0x4a7ec) [0x7f7c0d29c7ec]
  [ 12125.023] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f7c0d252000+0x59103) [0x7f7c0d2ab103]
  [ 12125.023] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f7c0d252000+0x593aa) [0x7f7c0d2ab3aa]
  [ 12125.023] (EE) 9: /usr/bin/X (0x55953d673000+0x13fb73) [0x55953d7b2b73]
  [ 12125.023] (EE) 10: /usr/bin/X (0x55953d673000+0x54ce3) [0x55953d6c7ce3]
  [ 12125.023] (EE) 11: /usr/bin/X (0x55953d673000+0x5818f) [0x55953d6cb18f]
  [ 12125.023] (EE) 12: /usr/bin/X (0x55953d673000+0x5c34b) [0x55953d6cf34b]
  [ 12125.023] (EE) 13: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f7c10e9ba40]
  [ 12125.023] (EE) 14: /usr/bin/X (_start+0x29) [0x55953d6b96c9]
  [ 12125.023] (EE)
  [ 12125.023] (EE) Segmentation fault at address 0x7f7e141995e0
  [ 12125.023] (EE)
  Fatal server error:
  [ 12125.023] (EE) Caught signal 11 (Segmentation fault). Server aborting

  I have attached the syslog file. The relevant messages for the three crashes from today can be found  at:
  Oct 28 15:56:36
  Oct 28 12:06:58
  Oct 28 09:08:51

  Unfortunately I have no clue how to reproduce the segfault. The last
  crash happened while I was reading some document and I did not push
  any button, moved the mouse or anything...

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: KDE
  Date: Wed Oct 28 16:30:43 2015
  DistUpgraded: 2015-10-27 11:46:32,614 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: kubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.19.0-31-generic, x86_64: installed
   bbswitch, 0.7, 4.2.0-16-generic, x86_64: installed
   nvidia-304, 304.128, 3.19.0-31-generic, x86_64: installed
   nvidia-304, 304.128, 4.2.0-16-generic, x86_64: installed
   vboxhost, 4.3.26, 3.19.0-31-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: No
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:091c]
  InstallationDate: Installed on 2015-01-20 (281 days ago)
  InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  LightdmGreeterLog:
   QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: Datei oder Verzeichnis nicht gefunden
   QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
   Bus::open: Can not get ibus-daemon's address.
   IBusInputContext::createInputContext: no connection to ibus-daemon
  LightdmGreeterLogOld:
   QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: Datei oder Verzeichnis nicht gefunden
   QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
   Bus::open: Can not get ibus-daemon's address.
   IBusInputContext::createInputContext: no connection to ibus-daemon
  MachineType: Acer Aspire VN7-571G
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=5ebd3c26-8bee-44ee-a832-0dbfb0ee72f4 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to wily on 2015-10-27 (1 days ago)
  dmi.bios.date: 01/08/2015
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V1.14
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Aspire VN7-571G
  dmi.board.vendor: Acer
  dmi.board.version: V1.14
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.14
  dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.14:bd01/08/2015:svnAcer:pnAspireVN7-571G:pvrV1.14:rvnAcer:rnAspireVN7-571G:rvrV1.14:cvnAcer:ct10:cvrV1.14:
  dmi.product.name: Aspire VN7-571G
  dmi.product.version: V1.14
  dmi.sys.vendor: Acer
  version.compiz: compiz N/A
  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: Wed Oct 28 15:56:36 2015
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1091
   vendor                                     LGD
  xserver.version: 2:1.17.2-1ubuntu9

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