compiz crashed with SIGSEGV in pthread_mutex_lock()

[lonesearchlism]

Binary package hint: compiz

try to use unity desktop via input command: unity

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: compiz-core 1:0.9.4git20110322-0ubuntu5
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: None
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1440x900 1280x1024 1280x1024 1440x900 1280x960 1280x800 1280x800 1152x864 1024x768 1024x768 1024x768 832x624 800x600 800x600 800x600 800x600 640x480 640x480 640x480 640x480 720x400
 edid-base64: AP///////wBMLTMGOTFVUDQTAQMOKRp4Kt6Ro1RMmSYPUFS/74BxT4EAgUCBgJUPgQ8BAQEBmimg0FGEIjBQmDYAmP8QAAAcAAAA/QA4Sx5RDgAKICAgICAgAAAA/ABTTUIxOTMwTlcKICAgAAAA/wBIVktTQzA0NTg5CiAgAOw=
Date: Mon Mar 28 09:24:36 2011
DistUpgraded: Log time: 2011-03-25 00:17:13.772282
DistroCodename: natty
DistroVariant: ubuntu
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 nVidia Corporation NV18 [GeForce4 MX 440 AGP 8x] [10de:0181] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: nVidia Corporation Device [10de:01b6]
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
InstallationMedia_: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: Dell Computer Corporation Dimension 4600
ProcCmdline: compiz --replace
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-7-generic root=UUID=66dcce6e-7335-4c6b-a3d6-7feb2e3d2d11 ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-7.39-generic 2.6.38
Renderer: Unknown
SegvAnalysis:
 Segfault happened at: 0x33633d <pthread_mutex_lock+29>: mov 0xc(%esi),%edi
 PC (0x0033633d) ok
 source "0xc(%esi)" (0x72206e7f) not located in a known VMA region (needed readable region)!
 destination "%edi" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 pthread_mutex_lock () from /lib/i386-linux-gnu/libpthread.so.0
 ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
 Glib::Source::unreference() const () from /usr/lib/libglibmm-2.4.so.1
 PrivateScreen::~PrivateScreen() ()
 PrivateScreen::~PrivateScreen() ()
Title: compiz crashed with SIGSEGV in pthread_mutex_lock()
UpgradeStatus: Upgraded to natty on 2011-03-25 (2 days ago)
UserGroups:

dmi.bios.date: 08/26/2004
dmi.bios.vendor: Dell Computer Corporation
dmi.bios.version: A12
dmi.board.name: 02Y832
dmi.board.vendor: Dell Computer Corp.
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Computer Corporation
dmi.modalias: dmi:bvnDellComputerCorporation:bvrA12:bd08/26/2004:svnDellComputerCorporation:pnDimension4600:pvr:rvnDellComputerCorp.:rn02Y832:rvr:cvnDellComputerCorporation:ct6:cvr:
dmi.product.name: Dimension 4600
dmi.sys.vendor: Dell Computer Corporation
version.compiz: compiz 1:0.9.4git20110322-0ubuntu5
version.libdrm2: libdrm2 2.4.23-1ubuntu5
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu6

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #729504, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.