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[Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>]

Just to clarify, X did not crash. gnome-session crashed because of mesa
not handling the failure. X itself should be pretty robust against oom.

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https://bugs.launchpad.net/bugs/1443116

Title:
  Xorg crash(?) (probably out of memory)

Status in xorg package in Ubuntu:
  New

Bug description:
  If memory runs out, maybe not much can be done, but I believe this has
  not happened to me in older Ubuntu versions:

  Apr 12 14:29:51 Ryksugan kernel: [15064.494054] Xorg: page allocation failure: order:0, mode:0xa00d4
  Apr 12 14:29:51 Ryksugan kernel: [15064.494063] CPU: 0 PID: 792 Comm: Xorg Tainted: P        W  OE  3.19.0-13-generic #13-Ubuntu
  Apr 12 14:29:51 Ryksugan kernel: [15064.494065] Hardware name: Dell Inc. Inspiron 1525                   /0U990C, BIOS A17 10/27/2009
  Apr 12 14:29:51 Ryksugan kernel: [15064.494067]  0000000000000000 ffff8800d784f618 ffffffff817c2205 ffff88011fc0fd78
  Apr 12 14:29:51 Ryksugan kernel: [15064.494071]  00000000000a00d4 ffff8800d784f6a8 ffffffff8117f148 ffff8800d784f698
  Apr 12 14:29:51 Ryksugan kernel: [15064.494074]  0000000100000000 0000000000000000 0000000000000042 ffff88011fff8e38
  Apr 12 14:29:51 Ryksugan kernel: [15064.494078] Call Trace:

  
  At about 14:30 I felt the machine sluggish and I knew chromium-browser had been eating up memory (4 GB RAM and 4 GB SSD swap, have seen it or parts of it get killed before without this result). [In the past I've had trouble, usually could do unity --replace in virtual console.]

  [Note, after]
  Apr 12 14:30:37 Ryksugan kernel: [15110.743287] chromium-browse: page allocation failure: order:0, mode:0xa00d4

  [Note before and all this probably unrelated, last chrome error before, /var/log/syslog.1 in reverse order:]
  Apr 12 14:14:35 Ryksugan kernel: [14148.682087] Out of memory: Kill process 13674 (chromium-browse) score 381 or sacrifice child
  ..
  Apr 12 14:04:24 Ryksugan kernel: [13537.199125] traps: chromium-browse[13500] trap invalid opcode ip:7fc6d4201fc9 sp:7ffcda1791f8 error:0 in libv8.so[7f
  c6d3d34000+5dc000]
  Apr 12 14:04:25 Ryksugan kernel: [13538.257833] traps: chromium-browse[13462] trap invalid opcode ip:7fc6d4201fc9 sp:7ffcda17ab68 error:0 in libv8.so[7f
  c6d3d34000+5dc000]

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-13.13-generic 3.19.3
  Uname: Linux 3.19.0-13-generic x86_64
  NonfreeKernelModules: wl
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.17-0ubuntu2
  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
  CurrentDesktop: Unity
  Date: Sun Apr 12 14:51:03 2015
  DistUpgraded: 2015-04-06 16:46:01,057 DEBUG enabling apt cron job
  DistroCodename: vivid
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) [8086:2a02] (rev 0c) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:022f]
     Subsystem: Dell Device [1028:022f]
  InstallationDate: Installed on 2014-08-21 (233 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Inspiron 1525
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-13-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg crash
  UpgradeStatus: Upgraded to vivid on 2015-04-06 (5 days ago)
  dmi.bios.date: 10/27/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A17
  dmi.board.name: 0U990C
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA17:bd10/27/2009:svnDellInc.:pnInspiron1525:pvr:rvnDellInc.:rn0U990C:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Inspiron 1525
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.1+15.04.20150330-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Sun Apr 12 14:30:42 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               12631 
   vendor                                     SEC
  xserver.version: 2:1.17.1-0ubuntu3

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