unity-2d-shell crashed with SIGSEGV

[Alex Chiang]

My favorite crash!

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity-2d-shell 5.12.0-0ubuntu1.2
ProcVersionSignature: Ubuntu 3.2.0-37.58-generic 3.2.35
Uname: Linux 3.2.0-37-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
Date: Wed Feb 20 02:39:39 2013
Disassembly: => 0x0: Cannot access memory at address 0x0
ExecutablePath: /usr/bin/unity-2d-shell
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
MarkForUpload: True
ProcCmdline: unity-2d-shell
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x0: Cannot access memory at address 0x0
 PC (0x00000000) not located in a known VMA region (needed executable region)!
SegvReason: executing NULL VMA
Signal: 11
SourcePackage: unity-2d
StacktraceTop:
 ?? ()
 ?? () from /usr/lib/x86_64-linux-gnu/libQtDeclarative.so.4
 ?? () from /usr/lib/x86_64-linux-gnu/libQtDeclarative.so.4
 ?? () from /usr/lib/x86_64-linux-gnu/libQtDeclarative.so.4
 ?? ()
Title: unity-2d-shell crashed with SIGSEGV
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sbuild sudo vboxusers

[Apport retracing service (apport)]

StacktraceTop:
 ?? ()
 ?? () from /usr/lib/x86_64-linux-gnu/libQtDeclarative.so.4
 ?? () from /usr/lib/x86_64-linux-gnu/libQtDeclarative.so.4
 ?? () from /usr/lib/x86_64-linux-gnu/libQtDeclarative.so.4
 ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4

[Martin Pitt (pitti)]

#0 0x0000000000000000 in ?? ()
No symbol table info available.
#1 0x00007fd483a783f4 in operator= (this=0x97cf78) at ../../include/QtDeclarative/private/../../../src/declarative/qml/qdeclarativepropertycache_p.h:75
No locals.
#2 QDeclarativePropertyCache::property (engine=<optimized out>, obj=0x500c030, name=@0x7fff32e6b888: 0x7fd470c9c720, local=...) at qml/qdeclarativepropertycache.cpp:430
        rv = 0x0
        enginePrivate = 0x8a2260
        cache = <optimized out>
        ddata = 0x339b4b0
#3 0x00007fd483a7eac9 in data (this=0x500c038) at ../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:135
No locals.
#4 qGetPtrHelper<QScopedPointer<QObjectData> > (p=...) at ../../include/QtCore/../../src/corelib/global/qglobal.h:2430
No locals.
#5 d_func (this=0x500c030) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:115
No locals.
#6 get (o=0x500c030) at ../../include/QtCore/private/../../../src/corelib/kernel/qobject_p.h:176
No locals.
#7 get (create=false, object=0x500c030) at ../../include/QtDeclarative/private/../../../src/declarative/qml/qdeclarativedata_p.h:140
        priv = <optimized out>
#8 QDeclarativeObjectScriptClass::queryProperty (this=0x97cf00, obj=0x500c030, name=@0x7fff32e6b888: 0x7fd470c9c720, flags=..., evalContext=0x0, hints=...) at qml/qdeclarativeobjectscriptclass.cpp:178
        ddata = 0x72006300530065
        enginePrivate = 0x8a2260
#9 0x00007fd483a7ed0b in ?? () at qml/qdeclarativeobjectscriptclass.cpp:156 from /tmp/apport_sandbox_CJD9C3/usr/lib/x86_64-linux-gnu/libQtDeclarative.so.4
No locals.
#10 0x00007fff32e6b850 in ?? ()
No symbol table info available.
#11 0x000000000097cf00 in ?? ()
No symbol table info available.
#12 0x00007fff00000001 in ?? ()
No symbol table info available.
#13 0x00007fff32e6b8e8 in ?? ()
No symbol table info available.
#14 0x00007fd400000000 in ?? ()
No symbol table info available.
#15 0x000000000097b930 in ?? ()
No symbol table info available.
#16 0x0000000001e083b0 in ?? ()
No symbol table info available.
#17 0x00007fff32e6b960 in ?? ()
No symbol table info available.
#18 0x000000000097b930 in ?? ()
No symbol table info available.
#19 0x00007fd47f577f6e in QScript::DeclarativeObjectDelegate::getOwnPropertySlot (this=0x97cf00, object=0x7fd45aeb4000, exec=0x7fd470819098, propertyName=..., slot=...) at bridge/qscriptdeclarativeobject.cpp:74
        identifier = 0x7fd470c9c720
        p = 0x7fff32e6b888
        flags = {i = 1887539352}
#20 0x00007fd47f41c1d5 in fastGetOwnPropertySlot (slot=..., propertyName=..., exec=0x7fd470819098, this=0x7fd45aeb4000) at ../3rdparty/javascriptcore/JavaScriptCore/runtime/JSObject.h:382
No locals.
#21 QTJSC::JSValue::get (this=<optimized out>, exec=0x7fd470819098, propertyName=..., slot=...) at ../3rdparty/javascriptcore/JavaScriptCore/runtime/JSObject.h:618
        prototype = <optimized out>
        cell = 0x7fd45aeb4000
#22 0x00007fd47f44e3cf in QTJSC::cti_op_get_by_id_generic (args=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/jit/JITStubs.cpp:1237
        callFrame = <optimized out>
        slot = {m_getValue = 0xffffffffffffffff, m_slotBase = {m_ptr = 0x7fd45aeb4000}, m_data = {getterFunc = 0x7fff32e6ba50, v...