compiz crashed with SIGSEGV in g_source_unref()

[Nizar Kerkeni]

Binary package hint: compiz

crashed when returning back to my gnome desktop after typing :
unity --reset

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
NonfreeKernelModules: nvidia
Architecture: i386
CrashCounter: 1
Date: Mon Apr 4 12:35:27 2011
DistroCodename: natty
DistroVariant: ubuntu
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20101202)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20101202)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=fr_FR.utf8
 LC_MESSAGES=en_US.utf8
 SHELL=/bin/bash
ProcVersionSignature_: Ubuntu 2.6.38-7.39-generic 2.6.38
SegvAnalysis:
 Segfault happened at: 0x2d7d99 <g_source_unref+25>: mov 0x10(%eax),%edx
 PC (0x002d7d99) ok
 source "0x10(%eax)" (0x000001ad) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 g_source_unref () 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() ()
 CompScreen::~CompScreen() ()
Title: compiz crashed with SIGSEGV in g_source_unref()
UpgradeStatus: Upgraded to natty on 2011-02-24 (38 days ago)
UserGroups:

XsessionErrors:
 (nautilus:1625): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed
 (<unknown>:1606): libindicator-WARNING **: Shortcut Group does not have key 'TargetEnvironment' falling back to deprecated use of 'OnlyShowIn' and 'NotShowIn'.
 (<unknown>:1606): dee-CRITICAL **: Failed to clone model from leader: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface `com.canonical.Dee.Model' on object at path /com/canonical/dee/model/com/canonical/Unity/ApplicationsPlace/SectionsModel
 (nm-applet:1642): GdkPixbuf-CRITICAL **: gdk_pixbuf_composite: assertion `dest_y >= 0 && dest_y + dest_height <= dest->height' failed
 (nautilus:1625): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu1