compiz crashed with SIGSEGV in pthread_mutex_lock()

Binary package hint: compiz

I has installed Cairo-Dock (just from Ubuntu repo) and testing it with misc settings. Cairo crashed two or three times (and by the way Cairo looks ugly with that new annoying _window_resize_grip_ hovering on desktop). And finally Compiz crashed.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: compiz-core 1:0.9.2.1+glibmainloop4-0ubuntu11
ProcVersionSignature: Ubuntu 2.6.38-4.31-generic 2.6.38-rc5
Uname: Linux 2.6.38-4-generic i686
NonfreeKernelModules: nvidia
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86 Kernel Module 260.19.29 Wed Dec 8 12:09:09 PST 2010
 GCC version: gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-3ubuntu2)
Architecture: i386
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
Date: Mon Feb 21 20:59:21 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 260.19.29, 2.6.38-4-generic, i686: installed
 nvidia-current, 260.19.29, 2.6.37-7-generic, i686: installed
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 nVidia Corporation C77 [GeForce 8200] [10de:0849] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: ASRock Incorporation K10N78FullHD-hSLI R3.0 GeForce 8200 [1849:0849]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20101202)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcCmdline: /usr/bin/compiz
ProcEnviron:
 LANGUAGE=en
 LANG=en_US.UTF-8
 LC_MESSAGES=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-4-generic root=UUID=78124a83-8e1c-4fda-a540-3fc749b9715f ro quiet splash vt.handoff=7
Renderer: Unknown
SegvAnalysis:
 Segfault happened at: 0xbf133d <pthread_mutex_lock+29>: mov 0xc(%esi),%edi
 PC (0x00bf133d) ok
 source "0xc(%esi)" (0x7070613f) 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/libpthread.so.0
 ?? () from /lib/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()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (exe:8754): Gdk-WARNING **: XID collision, trouble ahead
 (exe:8754): Gdk-WARNING **: XID collision, trouble ahead
 (process:9151): Gtk-WARNING **: Locale not supported by C library.
 (process:9397): Gtk-WARNING **: Locale not supported by C library.
dmi.bios.date: 10/22/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.20
dmi.board.name: K10N78M Pro
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.20:bd10/22/2009:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnK10N78MPro:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
version.compiz: compiz 1:0.9.2.1+glibmainloop4-0ubuntu11
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1~git20110215.cc1636b6-0ubuntu2
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg: xserver-xorg 1:7.5+6ubuntu3b1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.13.2-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20100805+b96170a-0ubuntu1