compiz keeps crashing in "Ubuntu Classic" session after tried to change settings (Natty Beta)

[Brian Saxby]

Binary package hint: compiz

I tried re-enabling the Desktop Cube and Rotate Cube which were disabled when I upgraded from Maverick to Natty. Even after switching back to Desktop Wall, Compiz keeps crashing.

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 x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Fri Apr 1 04:00:23 2011
DistroCodename: natty
DistroVariant: ubuntu
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
InstallationMedia_: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcCmdline: /usr/bin/compiz
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature_: Ubuntu 2.6.38-7.39-generic 2.6.38
SegvAnalysis:
 Segfault happened at: 0x7f6a0fa72394 <pthread_mutex_lock+4>: mov 0x10(%rdi),%esi
 PC (0x7f6a0fa72394) ok
 source "0x10(%rdi)" (0x5f7865646e695f86) 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/x86_64-linux-gnu/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 2011-04-01 (0 days ago)
UserGroups: adm admin cdrom dialout lp lpadmin plugdev sambashare
XsessionErrors:
 (nautilus:5319): Gtk-WARNING **: Change Desktop Background: missing action Change Desktop Background
 (nautilus:5319): Gtk-WARNING **: Ubuntu Documentation: missing action Ubuntu Documentation
 (nautilus:5319): Gtk-WARNING **: Change Desktop Background: missing action Change Desktop Background
 (nautilus:5319): Gtk-WARNING **: Ubuntu Documentation: missing action Ubuntu Documentation
 (nautilus:5319): 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

[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 #731486, 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.