Application: kpackagekit (0.5.4)
KDE Platform Version: 4.4.5 (KDE 4.4.5)
Qt Version: 4.6.3
Operating System: Linux 2.6.32-22-generic i686
Distribution: Ubuntu 10.04 LTS

-- Information about the crash:
I received a notification about a couple of updates, today, I clicked in it and KPackageKit popped up. Since I was working on something else, I moved the window to another virtual desktop to review it later. Something like 10 minutes later, instead, DrKonqui came out to inform me of this crash. To be honest, I received two simultaneous crash notifications about KPackageKit, but I thought they were about the same crash and decided to report only one - maybe this is indicative of something I am not aware of, but may be of help to you.

 -- Backtrace:
Application: KPackageKit (kpackagekit), signal: Segmentation fault
[KCrash Handler]
#6  0x00a813b9 in QBasicAtomicInt::fetchAndAddOrdered (this=0x8b0b05a) at ../../include/QtCore/../../src/corelib/arch/qatomic_i386.h:163
#7  QBasicAtomicInt::fetchAndAddAcquire (this=0x8b0b05a) at ../../include/QtCore/../../src/corelib/arch/qatomic_i386.h:296
#8  QMutex::lock (this=0x8b0b05a) at thread/qmutex.cpp:196
#9  0x00b83d34 in QCoreApplication::postEvent (receiver=0x8b02bf0, event=0x8bb93d8, priority=0) at kernel/qcoreapplication.cpp:1135
#10 0x00b840ac in QCoreApplication::postEvent (receiver=0x8b02bf0, event=0x8bb93d8) at kernel/qcoreapplication.cpp:1088
#11 0x00b940b4 in QObject::deleteLater (this=0x8b02bf0) at kernel/qobject.cpp:2158
#12 0x00676384 in PackageKit::ClientPrivate::serviceOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib/libpackagekit-qt.so.12
#13 0x00678453 in PackageKit::ClientPrivate::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libpackagekit-qt.so.12
#14 0x00b8947a in QMetaObject::metacall (object=0x8b02750, cl=87194, idx=6, argv=0xbfe76640) at kernel/qmetaobject.cpp:237
#15 0x00b97fbb in QMetaObject::activate (sender=0x8b0baf8, m=0x5efc88, local_signal_index=2, argv=0xbfe76640) at kernel/qobject.cpp:3295
#16 0x005d748f in QDBusConnectionInterface::serviceOwnerChanged (this=0x8b0baf8, _t1=..., _t2=..., _t3=...) at .moc/release-shared/moc_qdbusconnectioninterface.cpp:210
#17 0x005d77b3 in QDBusConnectionInterface::qt_metacall (this=0x8b0baf8, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfe76810) at .moc/release-shared/moc_qdbusconnectioninterface.cpp:137
#18 0x00b8947a in QMetaObject::metacall (object=0x8b0baf8, cl=87194, idx=7, argv=0xbfe76810) at kernel/qmetaobject.cpp:237
#19 0x00b97fbb in QMetaObject::activate (sender=0x8b0baf8, m=0x5efc88, local_signal_index=6, argv=0xbfe76810) at kernel/qobject.cpp:3295
#20 0x005d733f in QDBusConnectionInterface::NameOwnerChanged (this=0x8b0baf8, _t1=..., _t2=..., _t3=...) at .moc/release-shared/moc_qdbusconnectioninterface.cpp:238
#21 0x005d7843 in QDBusConnectionInterface::qt_metacall (this=0x8b0baf8, _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0xbfe76a1c) at .moc/release-shared/moc_qdbusconnectioninterface.cpp:141
#22 0x00597df4 in QDBusConnectionPrivate::deliverCall (this=0x8b0b5e0, object=0x8b0baf8, msg=..., metaTypes=..., slotIdx=11) at qdbusintegrator.cpp:904
#23 0x005a3097 in QDBusCallDeliveryEvent::placeMetaCall (this=0x8c57bb0, object=0x8b0baf8) at qdbusintegrator_p.h:101
#24 0x00b94c0e in QObject::event (this=0x8b0baf8, e=0x8c57bb0) at kernel/qobject.cpp:1248
#25 0x01130e8c in QApplicationPrivate::notify_helper (this=0x89145a0, receiver=0x8b0baf8, e=0x8c57bb0) at kernel/qapplication.cpp:4302
#26 0x01137a0e in QApplication::notify (this=0xbfe772ec, receiver=0x8b0baf8, e=0x8c57bb0) at kernel/qapplication.cpp:3706
#27 0x0035640a in KApplication::notify (this=0xbfe772ec, receiver=0x8b0baf8, event=0x8c57bb0) at ../../kdeui/kernel/kapplication.cpp:302
#28 0x00b8413b in QCoreApplication::notifyInternal (this=0xbfe772ec, receiver=0x8b0baf8, event=0x8c57bb0) at kernel/qcoreapplication.cpp:726
#29 0x00b87bfc in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x88f6420) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#30 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x88f6420) at kernel/qcoreapplication.cpp:1367
#31 0x00b87d7d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1260
#32 0x00bb033f in QCoreApplication::sendPostedEvents (s=0x8915710) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#33 postEventSourceDispatch (s=0x8915710) at kernel/qeventdispatcher_glib.cpp:276
#34 0x061275e5 in g_main_dispatch (context=0x8915690) at /build/buildd/glib2.0-2.24.1/glib/gmain.c:1960
#35 IA__g_main_context_dispatch (context=0x8915690) at /build/buildd/glib2.0-2.24.1/glib/gmain.c:2513
#36 0x0612b2d8 in g_main_context_iterate (context=0x8915690, block=<value optimized out>, dispatch=1, self=0x891a350) at /build/buildd/glib2.0-2.24.1/glib/gmain.c:2591
#37 0x0612b4b8 in IA__g_main_context_iteration (context=0x8915690, may_block=1) at /build/buildd/glib2.0-2.24.1/glib/gmain.c:2654
#38 0x00bafe35 in QEventDispatcherGlib::processEvents (this=0x88f5fb0, flags=...) at kernel/qeventdispatcher_glib.cpp:412
#39 0x011f0e15 in QGuiEventDispatcherGlib::processEvents (this=0x88f5fb0, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#40 0x00b82759 in QEventLoop::processEvents (this=0xbfe77244, flags=) at kernel/qeventloop.cpp:149
#41 0x00b82baa in QEventLoop::exec (this=0xbfe77244, flags=...) at kernel/qeventloop.cpp:201
#42 0x00b87e3f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1003
#43 0x01130f27 in QApplication::exec () at kernel/qapplication.cpp:3581
#44 0x0804d44b in _start ()

Reported using DrKonqi