Application that crashed: kpackagekit
Version of the application: 0.5.4
KDE Version: 4.3.5 (KDE 4.3.5)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.12-174.2.3.fc12.x86_64 x86_64
Distribution: "Fedora release 12 (Constantine)"

What I was doing when the application crashed:
The title has about as much details as it can provide.

 -- Backtrace:
Application: KPackageKit (kpackagekit), signal: Segmentation fault
82	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[KCrash Handler]
#5  0x00000039be254f8c in QMutex::lock (this=0x2012210) at thread/qmutex.cpp:152
#6  0x00000039be33eb72 in QCoreApplication::postEvent (receiver=0x1dda5d0, event=0x1d133d0, priority=0) at kernel/qcoreapplication.cpp:1020
#7  0x00000039c221de41 in PackageKit::ClientPrivate::serviceOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib64/libpackagekit-qt.so.12
#8  0x00000039c221f288 in PackageKit::ClientPrivate::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libpackagekit-qt.so.12
#9  0x00000039be35408c in QMetaObject::activate (sender=0x1d0bcc0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7fffdd17a920) at kernel/qobject.cpp:3112
#10 0x00000039bec558cf in QDBusConnectionInterface::serviceOwnerChanged (this=<value optimized out>, _t1=<value optimized out>, _t2=<value optimized out>, _t3=...)
    at .moc/release-shared/moc_qdbusconnectioninterface.cpp:204
#11 0x00000039bec55b64 in QDBusConnectionInterface::qt_metacall (this=0x1d0bcc0, _c=InvokeMetaMethod, _id=2, _a=0x7fffdd17aba0) at .moc/release-shared/moc_qdbusconnectioninterface.cpp:131
#12 0x00000039be35408c in QMetaObject::activate (sender=0x1d0bcc0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7fffdd17aba0) at kernel/qobject.cpp:3112
#13 0x00000039bec557ff in QDBusConnectionInterface::NameOwnerChanged (this=<value optimized out>, _t1=<value optimized out>, _t2=<value optimized out>, _t3=...)
    at .moc/release-shared/moc_qdbusconnectioninterface.cpp:232
#14 0x00000039bec55bcc in QDBusConnectionInterface::qt_metacall (this=0x1d0bcc0, _c=InvokeMetaMethod, _id=6, _a=0x7fffdd17afb0) at .moc/release-shared/moc_qdbusconnectioninterface.cpp:135
#15 0x00000039bec22e84 in QDBusConnectionPrivate::deliverCall (this=<value optimized out>, object=<value optimized out>, msg=<value optimized out>, metaTypes=..., slotIdx=<value optimized out>)
    at qdbusintegrator.cpp:891
#16 0x00000039bec2a61f in QDBusCallDeliveryEvent::placeMetaCall(QObject*) () from /usr/lib64/libQtDBus.so.4
#17 0x00000039be34e401 in QObject::event (this=0x1d0bcc0, e=0x1f56310) at kernel/qobject.cpp:1110
#18 0x00000039bfb8f65c in QApplicationPrivate::notify_helper (this=0x1bc6a20, receiver=0x1d0bcc0, e=0x1f56310) at kernel/qapplication.cpp:4065
#19 0x00000039bfb968ce in QApplication::notify (this=<value optimized out>, receiver=0x1d0bcc0, e=0x1f56310) at kernel/qapplication.cpp:4030
#20 0x00000039c13f68e6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#21 0x00000039be33ee6c in QCoreApplication::notifyInternal (this=0x7fffdd17b950, receiver=0x1d0bcc0, event=0x1f56310) at kernel/qcoreapplication.cpp:610
#22 0x00000039be33fa42 in sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x1b97950) at kernel/qcoreapplication.h:213
#23 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x1b97950) at kernel/qcoreapplication.cpp:1247
#24 0x00000039be367573 in sendPostedEvents (s=<value optimized out>) at kernel/qcoreapplication.h:218
#25 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:210
#26 0x00000039bae3920e in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#27 0x00000039bae3cbf8 in ?? () from /lib64/libglib-2.0.so.0
#28 0x00000039bae3cd1a in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#29 0x00000039be3671e6 in QEventDispatcherGlib::processEvents (this=0x1b97160, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#30 0x00000039bfc21ffe in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#31 0x00000039be33d772 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#32 0x00000039be33db44 in QEventLoop::exec (this=0x7fffdd17b8a0, flags=...) at kernel/qeventloop.cpp:201
#33 0x00000039be33fcd9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#34 0x0000000000406082 in _start ()

Reported using DrKonqi