unity-2d-panel crashed with SIGSEGV in sigc::internal::trackable_callback_list::add_callback()

[Steve Langasek]

switching video outputs with my laptop hotkey, the unity panel crashed.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity-2d-panel 4.12.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.1.0-3.3-generic 3.1.0
Uname: Linux 3.1.0-3-generic x86_64
ApportVersion: 1.25-0ubuntu1
Architecture: amd64
Date: Fri Nov 11 10:29:10 2011
ExecutablePath: /usr/bin/unity-2d-panel
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
ProcCmdline: unity-2d-panel
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f8502b496b6 <_ZN4sigc8internal23trackable_callback_list12add_callbackEPvPFS2_S2_E+22>: cmpb $0x0,0x10(%rdi)
 PC (0x7f8502b496b6) ok
 source "$0x0" ok
 destination "0x10(%rdi)" (0x00000074) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: unity-2d
StacktraceTop:
 sigc::internal::trackable_callback_list::add_callback(void*, void* (*)(void*)) () from /usr/lib/libsigc-2.0.so.0
 unity::indicator::Indicators::Impl::AddIndicator(std::string const&) () from /usr/lib/libunity-core-4.0.so.4
 unity::indicator::Indicators::AddIndicator(std::string const&) () from /usr/lib/libunity-core-4.0.so.4
 ?? () from /usr/lib/libunity-core-4.0.so.4
 ?? () from /usr/lib/libunity-core-4.0.so.4
Title: unity-2d-panel crashed with SIGSEGV in sigc::internal::trackable_callback_list::add_callback()
UpgradeStatus: Upgraded to precise on 2011-11-08 (2 days ago)
UserGroups: adm admin cdrom dialout libvirtd lpadmin mythtv plugdev sambashare src

[Apport retracing service (apport)]

StacktraceTop:
 sigc::internal::trackable_callback_list::add_callback (this=0x64, data=0x7f84f07d4f20, func=0x7f8502b49a50 <sigc::internal::slot_rep::notify(void*)>) at ../../sigc++/trackable.cc:95
 operator() (t=0x7f84f003d0b8, this=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/slot_base.h:148
 execute_ (_A_type=..., _A_action=<optimized out>) at /usr/include/sigc++-2.0/sigc++/visit_each.h:88
 operator()<sigc::trackable> (this=<optimized out>, _A_type=...) at /usr/include/sigc++-2.0/sigc++/visit_each.h:100
 visit_each<sigc::internal::limit_derived_target<sigc::trackable*, sigc::internal::slot_do_bind>, sigc::trackable> (_A_functor=..., _A_action=<optimized out>) at /usr/include/sigc++-2.0/sigc++/visit_each.h:144