compiz crashed with SIGSEGV in g_source_unref()

[Octavian Damiean]

Binary package hint: compiz

Here is the exact scenario although I can't tell for sure if this is related to the crash.

I was trying to install todays (2011-02-26 09:21:48) i386 build. On the live system booted from a pen drive the launcher constantly jumped in and out. Like there would be a window triggering the Intellihide function but it almost flickered (moved in and out at a high rate).

I have fixed this by restarting Unity from the terminal using unity --restart. A few seconds after restarting Unity the crash happened.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: compiz-core 1:0.9.4-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic i686
Architecture: i386
Date: Sat Feb 26 16:20:24 2011
ExecutablePath: /usr/bin/compiz
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110226)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x677ef9 <g_source_unref+25>: mov 0x10(%eax),%edx
 PC (0x00677ef9) ok
 source "0x10(%eax)" (0x00000018) 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/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()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (nautilus:6091): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed
 (gnome-settings-daemon:6057): libappindicator-CRITICAL **: app_indicator_set_menu: assertion `IS_APP_INDICATOR (self)' failed

[Apport retracing service (apport)]

StacktraceTop:
 g_source_unref () from /lib/libglib-2.0.so.0
 Glib::Source::unreference() const () from /usr/lib/libglibmm-2.4.so.1
 ~RefPtr (this=0x9af7540, __in_chrg=<value optimized out>) at /usr/include/glibmm-2.4/glibmm/refptr.h:207
 PrivateScreen::~PrivateScreen (this=0x9af7540, __in_chrg=<value optimized out>) at /build/buildd/compiz-0.9.4/src/screen.cpp:4776
 PrivateScreen::~PrivateScreen (this=0x9af7540, __in_chrg=<value optimized out>) at /build/buildd/compiz-0.9.4/src/screen.cpp:4778