compiz assert failure: compiz: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = UnityFBO]: asserzione \"px != 0\" non riuscita.

[Gionn]

Crash when resizing screen resolution.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity 4.24.0-0ubuntu2b1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
AssertionMessage: compiz: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = UnityFBO]: asserzione \"px != 0\" non riuscita.
CrashCounter: 1
Date: Thu Nov 17 09:16:11 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcCmdline: compiz
Signal: 6
SourcePackage: unity
StacktraceTop:
 raise () from /lib/x86_64-linux-gnu/libc.so.6
 abort () from /lib/x86_64-linux-gnu/libc.so.6
 __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
 ?? () from /usr/lib/compiz/libunityshell.so
 UnityScreen::glPaintOutput(GLScreenPaintAttrib const&, GLMatrix const&, CompRegion const&, CompOutput*, unsigned int) () from /usr/lib/compiz/libunityshell.so
Title: compiz assert failure: compiz: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = UnityFBO]: asserzione \"px != 0\" non riuscita.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 __GI___assert_fail (assertion=0x7f4f6acbc725 "px != 0", file=<optimized out>, line=418, function=<optimized out>) at assert.c:81
 boost::shared_ptr<UnityFBO>::operator-> (this=<optimized out>) at /usr/include/boost/smart_ptr/shared_ptr.hpp:418
 ~shared_ptr (this=<optimized out>, __in_chrg=<optimized out>) at /usr/include/boost/smart_ptr/shared_ptr.hpp:168
 operator[] (__k=<synthetic pointer>, this=0x1eb6a70) at /usr/include/c++/4.6/bits/stl_map.h:453
 UnityScreen::glPaintOutput (this=0x1eb6600, attrib=..., transform=..., region=..., output=0x6ef0490, mask=3) at /build/buildd/unity-4.24.0/plugins/unityshell/src/unityshell.cpp:949