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[Alexandr Novel <1382677@xxxxxxxxxxxxxxxxxx>]

The succesfull workaround for Xorg crashing on Intel GM45 integrated
graphics on Lenovo T400 was to create the the following file

/usr/share/X11/xorg.conf.d/20-intel-gm45.conf

Section "Device"
    Identifier  "Intel Graphics"
    Driver      "intel"
    Option      "AccelMethod"  "uxa"
EndSection

Swtiching from SNA to UXA alleviated all the problems.

As a side note, gtkperf tool is very reliable to reproduce SNA Xorg
crashes.

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https://bugs.launchpad.net/bugs/1382677

Title:
  Xorg crashed with SIGABRT in __GI___libc_free()

Status in “xorg-server” package in Ubuntu:
  New

Bug description:
  For some reason easily triggered by Firefox 31 to 33.
  Chromium and other graphical applications work without problems.

  Firefox 28 from the live Ubuntu 14.04 usb drive, does not trigger Xorg
  crash.

  The crashes occur with the stock Xorg as well as Xorg-edgers.

  One of the previous crashes was slightly different.

  sudo gdb /usr/bin/Xorg /etc/X11/core

  Reading symbols from /usr/bin/Xorg...Reading symbols from /usr/lib/debug//usr/bin/Xorg...done.
  done.
  [New LWP 8247]
  [New LWP 8248]
  [New LWP 8246]

  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  Core was generated by `/usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt'.
  Program terminated with signal SIGBUS, Bus error.
  #0  memset () at ../sysdeps/x86_64/memset.S:114
  114	../sysdeps/x86_64/memset.S: No such file or directory.
  (gdb) bt
  #0  memset () at ../sysdeps/x86_64/memset.S:114
  #1  0x00007f6ca68cd306 in ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
  #2  0x0000000000000000 in ?? ()

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-core 2:1.15.1-0ubuntu2.1
  ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
  Uname: Linux 3.5.0-18-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.5
  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
  CrashCounter: 1
  Date: Fri Oct 17 13:57:51 2014
  DistUpgraded: 2014-08-19 14:00:57,964 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExecutablePath: /usr/bin/Xorg
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:20e4]
     Subsystem: Lenovo Device [17aa:20e4]
  InstallationDate: Installed on 2012-06-22 (847 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: LENOVO 647341U
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcCmdline: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
  ProcEnviron:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-18-generic root=UUID=cc4e5011-50ff-4db4-856e-d1ef85ab4327 ro crashkernel=384M-:128M
  Signal: 6
  SourcePackage: xorg-server
  StacktraceTop:
   __GI___libc_free (mem=0xffffffffffffffff) at malloc.c:2929
   xf86CursorUnrealizeCursor (pDev=0x0, pScreen=0x7fdb1a212b70, pCurs=0x7fdb1a534a90) at ../../../../hw/xfree86/ramdac/xf86Cursor.c:294
   AnimCurUnrealizeCursor (pDev=<optimized out>, pScreen=0x7fdb1a212b70, pCursor=<optimized out>) at ../../render/animcur.c:282
   FreeCursor (value=0x7fdb1a534a90, cid=<optimized out>) at ../../dix/cursor.c:124
   ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
  Title: Xorg crashed with SIGABRT in __GI___libc_free()
  UpgradeStatus: Upgraded to trusty on 2014-08-19 (58 days ago)
  UserGroups:
   
  dmi.bios.date: 10/10/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7VET95WW (3.25 )
  dmi.board.name: 647341U
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr7VET95WW(3.25):bd10/10/2012:svnLENOVO:pn647341U:pvrThinkPadT400:rvnLENOVO:rn647341U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 647341U
  dmi.product.version: ThinkPad T400
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.58+git20141006.00847fa4-0ubuntu0ricotz~trusty
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.4.0~git20141017.9ebfb301-0ubuntu0ricotz~trusty
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.4.0~git20141017.9ebfb301-0ubuntu0ricotz~trusty
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.916+git20141016.6b98f162-0ubuntu0sarvatt~trusty
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Fri Oct 17 13:57:57 2014
  xserver.configfile: default
  xserver.errors:
   intel: Failed to load module "dri3" (module does not exist, 0)
   intel: Failed to load module "present" (module does not exist, 0)
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               16437 
   vendor                                     LEN
  xserver.version: 2:1.15.1-0ubuntu2.1

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