I get a couple of these a day
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 2.6.31.9-174.fc12.i686 i686
-- Backtrace:
Application: KDE Daemon (kded4), signal: Segmentation fault
[KCrash Handler]
#6 0x020ff908 in QMutex::lock() () from /usr/lib/libQtCore.so.4
#7 0x021f59d5 in QCoreApplication:

ostEvent(QObject*, QEvent*, int) () from /usr/lib/libQtCore.so.4
#8 0x021f5cdd in QCoreApplication:

ostEvent(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#9 0x02205405 in QObject::deleteLater() () from /usr/lib/libQtCore.so.4
#10 0x038d366f in PackageKit:

lientPrivate::serviceOwnerChanged(QSt ring const&, QString const&, QString const&) () from /usr/lib/libpackagekit-qt.so.12
#11 0x038d4c63 in PackageKit:

lientPrivate::qt_metacall(QMetaObject :

all, int, void**) () from /usr/lib/libpackagekit-qt.so.12
#12 0x0220bc0c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#13 0x0220c843 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x02056350 in QDBusConnectionInterface::serviceOwnerChanged(QStr ing const&, QString const&, QString const&) () from /usr/lib/libQtDBus.so.4
#15 0x020566ab in QDBusConnectionInterface::qt_metacall(QMetaObject:

all, int, void**) () from /usr/lib/libQtDBus.so.4
#16 0x0220bc0c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#17 0x0220c843 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#18 0x020561f0 in QDBusConnectionInterface::NameOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib/libQtDBus.so.4
#19 0x0205673b in QDBusConnectionInterface::qt_metacall(QMetaObject:

all, int, void**) () from /usr/lib/libQtDBus.so.4
#20 0x0201fa3c in ?? () from /usr/lib/libQtDBus.so.4
#21 0x020279a8 in ?? () from /usr/lib/libQtDBus.so.4
#22 0x02205f96 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#23 0x028f7b24 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0x028ff281 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0x0338707b in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0x021f5d73 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0x021f6972 in QCoreApplicationPrivate::sendPostedEvents(QObject* , int, QThreadData*) () from /usr/lib/libQtCore.so.4
#28 0x021f6b2e in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#29 0x02220f40 in ?? () from /usr/lib/libQtCore.so.4
#30 0x0054b128 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0x0054ea58 in ?? () from /lib/libglib-2.0.so.0
#32 0x0054eb84 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0x02220b6d in QEventDispatcherGlib:

rocessEvents(QFlags<QEventL oop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x02997356 in ?? () from /usr/lib/libQtGui.so.4
#35 0x021f42aa in QEventLoop:

rocessEvents(QFlags<QEventLoop::Proce ssEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0x021f470a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsF lag>) () from /usr/lib/libQtCore.so.4
#37 0x021f6bf7 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0x028f79a8 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0x00178815 in kdemain () from /usr/lib/libkdeinit4_kded4.so
#40 0x0804868c in _start ()
The auto bug reporting says it cant report it