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[geez <1502518@xxxxxxxxxxxxxxxxxx>]

I don't think this is a duplicate, anyway not one with the same cause.
This started occurring after the upgrade to 15.10 beta; it wasn't an
issue on 15.04.

Additionally, gdm does not even start / show the login prompt, while the
original post clearly states that the user logged in first.

** This bug is no longer a duplicate of bug 1237904
   Xorg crashed with SIGABRT in OsAbort()

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https://bugs.launchpad.net/bugs/1502518

Title:
  Xorg crashed with SIGABRT in OsAbort()

Status in xorg-server package in Ubuntu:
  New

Bug description:
  Upgraded from 15.04 to 15.10 using update-manager -d. I'm running
  GNOME Shell, and as such was using gdm.

  gdm will immediately crash X before showing the login prompt. Using
  dpkg-reconfigure gdm I was able to switch to lightdm, which works.
  Hence the problem seems to lie in gdm or the xorg/gdm combo.

  ProblemType: Crash
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-core 2:1.17.2-1ubuntu9
  ProcVersionSignature: Ubuntu 4.2.0-12.14-generic 4.2.1
  Uname: Linux 4.2.0-12-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Sat Oct  3 23:47:58 2015
  DistUpgraded: 2015-10-03 23:44:57,615 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  ExecutablePath: /usr/bin/Xorg
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:0743]
  InstallationDate: Installed on 2013-05-12 (874 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Acer V5-171
  ProcCmdline: /usr/bin/X vt7 -displayfd 3 -auth /run/user/116/gdm/Xauthority -nolisten tcp -background none -noreset -keeptty -verbose 3
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-12-generic root=UUID=561b2fd6-3a7a-49b8-ba4d-e2eadfc4cb26 ro quiet splash acpi_osi=Linux intel_pstate=enable vt.handoff=7
  Signal: 6
  SourcePackage: xorg-server
  StacktraceTop:
   OsAbort ()
   FatalError ()
   ?? ()
   xf86CloseConsole ()
   ddxGiveUp ()
  Title: Xorg crashed with SIGABRT in OsAbort()
  UpgradeStatus: Upgraded to wily on 2015-10-03 (0 days ago)
  UserGroups:
   
  dmi.bios.date: 03/08/2013
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.15
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Mimic
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.15
  dmi.modalias: dmi:bvnAcer:bvrV2.15:bd03/08/2013:svnAcer:pnV5-171:pvrV2.15:rvnAcer:rnMimic:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.15:
  dmi.product.name: V5-171
  dmi.product.version: V2.15
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.12.2+15.10.20150908-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.0-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.0-1ubuntu1
  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+git20150808-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Sat Oct  3 23:53:56 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               12892 
   vendor                                     AUO
  xserver.version: 2:1.17.2-1ubuntu9

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