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.x86_64 x86_64
Distribution: "Fedora release 12 (Constantine)"

What I was doing when the application crashed:
f

 -- Backtrace:
Application: KDE Daemon (kded4), signal: Segmentation fault
[KCrash Handler]
#5  0x00000030f3854f89 in QMutex::lock() () from /usr/lib64/libQtCore.so.4
#6  0x00000030f393eb72 in QCoreApplication::postEvent(QObject*, QEvent*, int) () from /usr/lib64/libQtCore.so.4
#7  0x00000030f841de41 in PackageKit::ClientPrivate::serviceOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib64/libpackagekit-qt.so.12
#8  0x00000030f841f288 in PackageKit::ClientPrivate::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libpackagekit-qt.so.12
#9  0x00000030f395408c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQtCore.so.4
#10 0x00000030f24558cf in QDBusConnectionInterface::serviceOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib64/libQtDBus.so.4
#11 0x00000030f2455b64 in QDBusConnectionInterface::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libQtDBus.so.4
#12 0x00000030f395408c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQtCore.so.4
#13 0x00000030f24557ff in QDBusConnectionInterface::NameOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib64/libQtDBus.so.4
#14 0x00000030f2455bcc in QDBusConnectionInterface::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libQtDBus.so.4
#15 0x00000030f2422e84 in ?? () from /usr/lib64/libQtDBus.so.4
#16 0x00000030f242a61f in ?? () from /usr/lib64/libQtDBus.so.4
#17 0x00000030f394e401 in QObject::event(QEvent*) () from /usr/lib64/libQtCore.so.4
#18 0x00000033ccb8f65c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#19 0x00000033ccb968ce in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#20 0x00000033cec11a66 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#21 0x00000030f393ee6c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#22 0x00000030f393fa42 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/libQtCore.so.4
#23 0x00000030f3967573 in ?? () from /usr/lib64/libQtCore.so.4
#24 0x00000030eac3922e in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#25 0x00000030eac3cc18 in ?? () from /lib64/libglib-2.0.so.0
#26 0x00000030eac3cd3a in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#27 0x00000030f39671e6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#28 0x00000033ccc21ffe in ?? () from /usr/lib64/libQtGui.so.4
#29 0x00000030f393d772 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#30 0x00000030f393db44 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#31 0x00000030f393fcd9 in QCoreApplication::exec() () from /usr/lib64/libQtCore.so.4
#32 0x00000033cc60b6eb in kdemain () from /usr/lib64/libkdeinit4_kded4.so
#33 0x00000030e841eb1d in __libc_start_main () from /lib64/libc.so.6
#34 0x0000000000400709 in _start ()

Reported using DrKonqi