Application that crashed: kded4
Version of the application: $Id: kded.cpp 1031638 2009-10-05 16:59:11Z lunakl $
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.12-174.2.3.fc12.i686.PAE i686

What I was doing when the application crashed:
Updated the system with all updates using 'yum update', restarted the machine and then open GUI 'Opened Software Updates' and got this crash. 

 -- Backtrace:
Application: KDE Daemon (kded4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77bf7a0 (LWP 1664))]

Thread 2 (Thread 0xb201db70 (LWP 1686)):
#0  0x00dafdc6 in clock_gettime () from /lib/librt.so.1
#1  0x00f9273b in ?? () from /usr/lib/libQtCore.so.4
#2  0x00f92932 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00f92adb in ?? () from /usr/lib/libQtCore.so.4
#4  0x00f90d50 in ?? () from /usr/lib/libQtCore.so.4
#5  0x010a32c0 in g_main_context_prepare () from /lib/libglib-2.0.so.0
#6  0x010a3679 in ?? () from /lib/libglib-2.0.so.0
#7  0x010a3b84 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#8  0x00f90ba7 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#9  0x00f642aa in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#10 0x00f6470a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#11 0x00e71a54 in QThread::exec() () from /usr/lib/libQtCore.so.4
#12 0x00f46a3c in ?? () from /usr/lib/libQtCore.so.4
#13 0x00e74de3 in ?? () from /usr/lib/libQtCore.so.4
#14 0x00115ab5 in start_thread () from /lib/libpthread.so.0
#15 0x0577cdce in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb77bf7a0 (LWP 1664)):
[KCrash Handler]
#6  0x00e6f908 in QMutex::lock() () from /usr/lib/libQtCore.so.4
#7  0x00f659d5 in QCoreApplication::postEvent(QObject*, QEvent*, int) () from /usr/lib/libQtCore.so.4
#8  0x00f65cdd in QCoreApplication::postEvent(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#9  0x00f75405 in QObject::deleteLater() () from /usr/lib/libQtCore.so.4
#10 0x03444b1f in PackageKit::ClientPrivate::serviceOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib/libpackagekit-qt.so.12
#11 0x03446113 in PackageKit::ClientPrivate::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libpackagekit-qt.so.12
#12 0x00f7bc0c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#13 0x00f7c843 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x00e12f10 in QDBusConnectionInterface::serviceOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib/libQtDBus.so.4
#15 0x00e1326b in QDBusConnectionInterface::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libQtDBus.so.4
#16 0x00f7bc0c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#17 0x00f7c843 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#18 0x00e12db0 in QDBusConnectionInterface::NameOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib/libQtDBus.so.4
#19 0x00e132fb in QDBusConnectionInterface::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libQtDBus.so.4
#20 0x00ddc5fc in ?? () from /usr/lib/libQtDBus.so.4
#21 0x00de4568 in ?? () from /usr/lib/libQtDBus.so.4
#22 0x00f75f96 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#23 0x0713fb24 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0x07147281 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0x0080f07b in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0x00f65d73 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0x00f66972 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#28 0x00f66b2e in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#29 0x00f90f40 in ?? () from /usr/lib/libQtCore.so.4
#30 0x010a0128 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0x010a3a58 in ?? () from /lib/libglib-2.0.so.0
#32 0x010a3b84 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0x00f90b6d in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x071df356 in ?? () from /usr/lib/libQtGui.so.4
#35 0x00f642aa in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0x00f6470a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0x00f66bf7 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0x0713f9a8 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0x00165815 in kdemain () from /usr/lib/libkdeinit4_kded4.so
#40 0x0804868c in _start ()

Reported using DrKonqi