Application that crashed: systemsettings
Version of the application: 1.0
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.5-127.fc12.i686.PAE i686
Distribution: "Fedora release 12 (Constantine)"

What I was doing when the application crashed:
Add Remove Software (kpackagekit) KDE 4.3 Crash after Cancelling Searching of Software Updates. On selecting Software updates from the tab, we get a message "waiting for other tasks", and this message appears endlessly. On clicking cancel the App crashed.

 -- Backtrace:
Application: System Settings (systemsettings), signal: Segmentation fault
[KCrash Handler]
#6  0x0788a2de in PackageKit::Transaction::percentage() const () from /usr/lib/libpackagekit-qt.so.12
#7  0x0784e7f3 in KpkTransactionBar::updateUi() () from /usr/lib/libkpackagekitlib.so
#8  0x078392a3 in KpkTransactionBar::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkpackagekitlib.so
#9  0x0437dbfc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#10 0x0437e833 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#11 0x07889ce8 in PackageKit::Transaction::changed() () from /usr/lib/libpackagekit-qt.so.12
#12 0x0788b901 in PackageKit::Transaction::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libpackagekit-qt.so.12
#13 0x0437dbfc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x0437e833 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#15 0x07892888 in PackageKit::TransactionProxy::Changed() () from /usr/lib/libpackagekit-qt.so.12
#16 0x078931e3 in PackageKit::TransactionProxy::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libpackagekit-qt.so.12
#17 0x00176a3c in ?? () from /usr/lib/libQtDBus.so.4
#18 0x0017e9a8 in ?? () from /usr/lib/libQtDBus.so.4
#19 0x04377f86 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#20 0x04925b24 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#21 0x0492d281 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x0564852b in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#23 0x04367d63 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#24 0x04368962 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#25 0x04368b1e in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#26 0x04392f30 in ?? () from /usr/lib/libQtCore.so.4
#27 0x00495118 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#28 0x00498a48 in ?? () from /lib/libglib-2.0.so.0
#29 0x00498b74 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#30 0x04392b5d in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#31 0x049c5356 in ?? () from /usr/lib/libQtGui.so.4
#32 0x0436629a in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#33 0x043666fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x04368be7 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#35 0x049259a8 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#36 0x080526c8 in _start ()

Reported using DrKonqi