compiz crashed with SIGSEGV in pthread_mutex_lock()

[Henrique Rocha]

Binary package hint: compiz

This happened to me while switching from one virtual desktop to another.
I'm using a freshly updated natty.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: compiz-core 1:0.9.4-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
Uname: Linux 2.6.38-6-generic x86_64
Architecture: amd64
CrashCounter: 1
Date: Wed Mar 16 16:18:50 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7fefc20de394 <pthread_mutex_lock+4>: mov 0x10(%rdi),%esi
 PC (0x7fefc20de394) ok
 source "0x10(%rdi)" (0xf000101c70030) not located in a known VMA region (needed readable region)!
 destination "%esi" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 pthread_mutex_lock () from /lib/x86_64-linux-gnu/libpthread.so.0
 ?? () from /lib/libglib-2.0.so.0
 PrivateScreen::~PrivateScreen() ()
 PrivateScreen::~PrivateScreen() ()
 CompScreen::~CompScreen() ()
Title: compiz crashed with SIGSEGV in pthread_mutex_lock()
UpgradeStatus: Upgraded to natty on 2010-09-07 (189 days ago)
UserGroups: sudo

[Apport retracing service (apport)]

StacktraceTop:
 __pthread_mutex_lock (mutex=0xf000101c70020) at pthread_mutex_lock.c:50
 g_source_unref_internal (source=0x20d72e0, context=0xf000101c70018, have_lock=0) at /build/buildd/glib2.0-2.28.3/./glib/gmain.c:1671
 ~RefPtr (this=0x1116ab0, __in_chrg=<value optimized out>) at /usr/include/glibmm-2.4/glibmm/refptr.h:207
 PrivateScreen::~PrivateScreen (this=0x1116ab0, __in_chrg=<value optimized out>) at /build/buildd/compiz-0.9.4/src/screen.cpp:4781
 __exchange_and_add_single (this=0x1116ab0, __in_chrg=<value optimized out>) at /usr/include/c++/4.5/ext/atomicity.h:65