compiz crashed with SIGSEGV in nux::Area::SetVisible()

[Fabien Tassin]

Binary package hint: unity

using the meta key shortcuts, compiz crashed.
reproduced 3 times in a row

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: unity 3.6.0-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Wed Mar 2 10:26:15 2011
ExecutablePath: /usr/bin/compiz
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/usr/bin/tcsh
SegvAnalysis:
 Segfault happened at: 0x7f9aeed91086 <nux::Area::SetVisible(bool)+86>: cmp %r14,0x8(%rbp)
 PC (0x7f9aeed91086) ok
 source "%r14" ok
 destination "0x8(%rbp)" (0x00000059) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 emit (this=0x3a8ad38, visible=false) at /usr/include/sigc++-2.0/sigc++/signal.h:1244
 emit (this=0x3a8ad38, visible=false) at /usr/include/sigc++-2.0/sigc++/signal.h:2885
 nux::Area::SetVisible (this=0x3a8ad38, visible=false) at ./Area.cpp:546
 PlacesGroup::Refresh() () from /usr/lib/compiz/libunityshell.so
 PlacesGroup::OnIdleRelayout(PlacesGroup*) () from /usr/lib/compiz/libunityshell.so
Title: compiz crashed with SIGSEGV in emit()
UpgradeStatus: Upgraded to natty on 2009-07-28 (581 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 emit (this=0x3a8ad38, visible=false) at /usr/include/sigc++-2.0/sigc++/signal.h:1244
 emit (this=0x3a8ad38, visible=false) at /usr/include/sigc++-2.0/sigc++/signal.h:2885
 nux::Area::SetVisible (this=0x3a8ad38, visible=false) at ./Area.cpp:546
 PlacesGroup::Refresh (this=0x826c4c0) at /build/buildd/unity-3.6.0/src/PlacesGroup.cpp:175
 PlacesGroup::OnIdleRelayout (self=0x826c4c0) at /build/buildd/unity-3.6.0/src/PlacesGroup.cpp:199