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[dino99 <1165426@xxxxxxxxxxxxxxxxxx>]

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** Changed in: compiz (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1165426

Title:
  compiz suddenly starts consuming 100% CPU and hangs the whole system

Status in compiz package in Ubuntu:
  Invalid

Bug description:
  At random times, suddently and without apparent reason, compiz
  suddently starts consuming 99-100% CPU and makes the whole system
  unresponsive.

  Actually there are TWO BUGS here:
  - the fact itself that compiz starts eating up all that CPU (a bug in compiz by definition, whether or not accompanied by a bug in some other piece of the system)
  - the fact that this is enough to render the whole system unresponsive. Responsiveness to keyboard and mouse should always have the maximum priority and allow you to, for example, alt-tab and open a terminal, or, if that itself depends on compiz being able to respond, then at least respond to keyboard input in order to do e.g. ctrl+Alt+F1 which lets you open a virtual terminal.

  Actually by pressing ctlr+alt+F1 hundreds of time it finally caught
  one and let me open a virtual terminal, which is how I could figure
  out it was compiz who was eating 100% CPU.

  Also, there should be a way to kill compiz and restart it, shouldn't
  it?

  This has already happened to me a few times.

  This may, or may not, be related to #1162568

  The differences observed are:
  - in this case it is 100% CPU consumption, no high disk I/O; in 1162568 it is massive disk I/O and low/normal CPU activity
  - In 1162568 the mere action of switching to the virtual terminal, itself stopped the issue (unless it was a lucky coincidence). In this case it didn't. It just allowed me

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: compiz 1:0.9.8.6-0ubuntu1
  ProcVersionSignature: Ubuntu 3.5.0-27.46-generic 3.5.7.7
  Uname: Linux 3.5.0-27-generic i686
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86 Kernel Module  304.43  Sun Aug 19 20:20:21 PDT 2012
   GCC version:  gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1)
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: i386
  CompizPlugins: [core,composite,opengl,decor,vpswitch,mousepoll,compiztoolbox,snap,commands,place,resize,session,regex,grid,wall,move,gnomecompat,imgpng,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Sat Apr  6 16:50:40 2013
  DistUpgraded: 2013-01-13 11:55:33,566 DEBUG enabling apt cron job
  DistroCodename: quantal
  DistroVariant: ubuntu
  GraphicsCard:
   NVIDIA Corporation G84 [GeForce 9500M GS] [10de:0405] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:15d2]
  InstallationDate: Installed on 2010-06-23 (1018 days ago)
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MachineType: ASUSTeK Computer Inc. M51Sn
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-27-generic root=UUID=173acbf5-26a0-49e3-8d2b-f1c142582cbf ro quiet splash
  SourcePackage: compiz
  UpgradeStatus: Upgraded to quantal on 2013-01-13 (83 days ago)
  dmi.bios.date: 12/24/2007
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 303
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: M51Sn
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr303:bd12/24/2007:svnASUSTeKComputerInc.:pnM51Sn:pvr1.0:rvnASUSTeKComputerInc.:rnM51Sn:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: M51Sn
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.
  version.compiz: compiz 1:0.9.8.6-0ubuntu1
  version.libdrm2: libdrm2 2.4.39-0ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.3-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.3-0ubuntu0.1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu6.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99~git20120913.8637f772-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.2-0ubuntu3

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