compiz crashed with SIGSEGV in nux::Property<int>::operator= from unity::ui::Decaymulator::OnDecayTimeout()

[Martin Pool]

crashed like this when switching monitor configuration.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity 5.4.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-15.24-generic 3.2.5
Uname: Linux 3.2.0-15-generic x86_64
ApportVersion: 1.92-0ubuntu1
Architecture: amd64
Date: Tue Feb 21 19:04:22 2012
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120128)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_AU:en
 PATH=(custom, user)
 LANG=en_AU.UTF-8
 SHELL=/usr/bin/zsh
SegvAnalysis:
 Segfault happened at: 0x7f6f7ac0debd <_ZN3nux8PropertyIiEaSERKi+45>: mov 0x8(%rdi),%rax
 PC (0x7f6f7ac0debd) ok
 source "0x8(%rdi)" (0x240000000056) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 nux::Property<int>::operator=(int const&) () from /usr/lib/compiz/libunityshell.so
 unity::ui::Decaymulator::OnDecayTimeout(void*) () from /usr/lib/compiz/libunityshell.so
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: compiz crashed with SIGSEGV in nux::Property<int>::operator=()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 empty (this=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/slot_base.h:273
 operator() (_A_a2=@0x7fff3b115988, _A_a1=@0x391426c, this=0x3914270) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:592
 Set (value=@0x7fff3b115988, this=0x3914258) at /usr/include/Nux-2.0/NuxCore/Property-inl.h:105
 nux::Property<int>::operator= (this=<optimized out>, value=<optimized out>) at /usr/include/Nux-2.0/NuxCore/Property-inl.h:75
 unity::ui::Decaymulator::OnDecayTimeout (data=<optimized out>) at /build/buildd/unity-5.4.0/plugins/unityshell/src/Decaymulator.cpp:53

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

Confirmed, but I won't target a milestone because it looks like this bug might have been fixed already (somewhere). If more instances of this bug are found, then we'll target a milestone.