Application that crashed: systemsettings
Version of the application: 1.0
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.9-174.fc12.x86_64 x86_64
Distribution: "Fedora release 12 (Constantine)"

What I was doing when the application crashed:
Clicked on System Settings/Add and Remove Software/Software Updates while yum was already running.  Then cancelled.

 -- Backtrace:
Application: System Settings (systemsettings), signal: Segmentation fault
82	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
The current source language is "auto; currently asm".
[KCrash Handler]
#5  0x00007fc8034fff4c in PackageKit::Transaction::percentage() const () from /usr/lib64/libpackagekit-qt.so.12
#6  0x00007fc8032c51d2 in KpkTransactionBar::updateUi() () from /usr/lib64/libkpackagekitlib.so
#7  0x00007fc8032b090c in KpkTransactionBar::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkpackagekitlib.so
#8  0x00000039cf75408c in QMetaObject::activate (sender=0xe6a230, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3112
#9  0x00007fc80350174a in PackageKit::Transaction::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libpackagekit-qt.so.12
#10 0x00000039cf75408c in QMetaObject::activate (sender=0xe62e90, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3112
#11 0x00007fc803508d44 in PackageKit::TransactionProxy::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libpackagekit-qt.so.12
#12 0x00000039d0422e84 in QDBusConnectionPrivate::deliverCall (this=<value optimized out>, object=<value optimized out>, msg=<value optimized out>, metaTypes=..., slotIdx=<value optimized out>)
    at qdbusintegrator.cpp:891
#13 0x00000039d042a61f in QDBusCallDeliveryEvent::placeMetaCall(QObject*) () from /usr/lib64/libQtDBus.so.4
#14 0x00000039cf74e401 in QObject::event (this=0xe62e90, e=0xe69e20) at kernel/qobject.cpp:1110
#15 0x00000039d098f65c in QApplicationPrivate::notify_helper (this=0x7f6ba0, receiver=0xe62e90, e=0xe69e20) at kernel/qapplication.cpp:4065
#16 0x00000039d09968ce in QApplication::notify (this=<value optimized out>, receiver=0xe62e90, e=0xe69e20) at kernel/qapplication.cpp:4030
#17 0x00000039d1c11a66 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#18 0x00000039cf73ee6c in QCoreApplication::notifyInternal (this=0x7fff9e235410, receiver=0xe62e90, event=0xe69e20) at kernel/qcoreapplication.cpp:610
#19 0x00000039cf73fa42 in sendEvent (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#20 QCoreApplicationPrivate::sendPostedEvents (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.cpp:1247
#21 0x00000039cf767573 in sendPostedEvents () at kernel/qcoreapplication.h:218
#22 postEventSourceDispatch () at kernel/qeventdispatcher_glib.cpp:210
#23 0x000000391923922e in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#24 0x000000391923cc18 in ?? () from /lib64/libglib-2.0.so.0
#25 0x000000391923cd3a in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#26 0x00000039cf7671e6 in QEventDispatcherGlib::processEvents (this=0x7c1790, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#27 0x00000039d0a21ffe in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#28 0x00000039cf73d772 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#29 0x00000039cf73db44 in QEventLoop::exec (this=0x7fff9e235360, flags=...) at kernel/qeventloop.cpp:201
#30 0x00000039cf73fcd9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#31 0x000000000040c2f9 in _start ()

Reported using DrKonqi