compiz crashed with SIGSEGV in ObjectPtr() from unity::launcher::Launcher::DndReset() from unity::launcher::Launcher::OnUpdateDragManagerTimeout()

[Tamas Papp]

I enabled Application switcher beside Static application switcher.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity 5.4.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-17.26-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
CrashCounter: 1
Date: Mon Feb 20 13:02:15 2012
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
SegvAnalysis:
 Segfault happened at: 0x7fea54ffb650 <_ZN5unity8launcher8Launcher8DndResetEv+64>: mov (%rbx),%rax
 PC (0x7fea54ffb650) ok
 source "(%rbx)" (0x68800000074) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 unity::launcher::Launcher::DndReset() () from /usr/lib/compiz/libunityshell.so
 unity::launcher::Launcher::OnUpdateDragManagerTimeout(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 unity::launcher::Launcher::DndReset()
UpgradeStatus: Upgraded to precise on 2011-08-27 (176 days ago)
UserGroups: adm admin bacula cdrom dialout libvirtd lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 ObjectPtr (other=<optimized out>, this=0x7fff92c0f280) at /usr/include/Nux-2.0/NuxCore/ObjectPtr.h:51
 unity::launcher::Launcher::DndReset (this=0x2e2abf0) at /build/buildd/unity-5.4.0/plugins/unityshell/src/Launcher.cpp:2575
 unity::launcher::Launcher::OnUpdateDragManagerTimeout (data=0x2e2abf0) at /build/buildd/unity-5.4.0/plugins/unityshell/src/Launcher.cpp:1431
 g_timeout_dispatch (source=0x45da660, callback=<optimized out>, user_data=<optimized out>) at /build/buildd/glib2.0-2.31.16/./glib/gmain.c:3854
 g_main_dispatch (context=0x2214160) at /build/buildd/glib2.0-2.31.16/./glib/gmain.c:2510

[Launchpad Janitor (janitor)]

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

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 931033, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.