Public bug reported:

Binary package hint: unity

Changing from "Snapping Windows " to "Wobbly Windows" in Compiz caused
Compiz to crash. Froze system for ten to fifteen seconds with only the
wall paper and mouse pointer ( which still moved) visible. After the
crash, "Wobbly Windows" wasn't activated but Snapping Windows was
disabled. Going back into Compiz and turning on Wobbly Windows had the
same crash results but after the system came back up , Wobbly Windows
was activated.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: unity 3.6.8-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Sun Mar 27 10:58:08 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x239e3d <_ZNK4sigc11signal_base4implEv+29>:     mov    
0x4(%edi),%esi
 PC (0x00239e3d) ok
 source "0x4(%edi)" (0x0000007c) not located in a known VMA region (needed 
readable region)!
 destination "%esi" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 sigc::signal_base::impl() const () from /usr/lib/libsigc-2.0.so.0
 sigc::signal_base::connect(sigc::slot_base const&) () from 
/usr/lib/libsigc-2.0.so.0
 UnityScreen::UnityScreen(CompScreen*) () from /usr/lib/compiz/libunityshell.so
 CompPlugin::VTableForScreenAndWindow<UnityScreen, 
UnityWindow>::initScreen(CompScreen*) () from /usr/lib/compiz/libunityshell.so
 CompManager::initPlugin(CompPlugin*) ()
Title: compiz crashed with SIGSEGV in sigc::signal_base::impl()
UpgradeStatus: Upgraded to natty on 2011-03-26 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-crash i386 natty running-unity

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https://bugs.launchpad.net/bugs/743673

Title:
  compiz crashed with SIGSEGV in sigc::signal_base::impl()

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