Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.3 (KDE 4.3.3)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.6-166.fc12.i686 i686
Distribution: "Fedora release 12 (Constantine)"

What I was doing when the application crashed:
trying to add a widget with the plasmoid add widget process.

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77497a0 (LWP 2210))]

Thread 2 (Thread 0xac616b70 (LWP 2211)):
#0  0x00ce1416 in __kernel_vsyscall ()
#1  0x00b22c45 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x028c5e5f in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0x02f0ee42 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0x028c4de3 in ?? () from /usr/lib/libQtCore.so.4
#5  0x00b1eab5 in start_thread () from /lib/libpthread.so.0
#6  0x00a7583e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb77497a0 (LWP 2210)):
[KCrash Handler]
#6  0x036ecb8d in QGraphicsItem::update(QRectF const&) () from /usr/lib/libQtGui.so.4
#7  0x07308c80 in ?? () from /usr/lib/python2.6/site-packages/PyQt4/QtGui.so
#8  0x05fca05a in PyCFunction_Call () from /usr/lib/libpython2.6.so.1.0
#9  0x06026073 in PyEval_EvalFrameEx () from /usr/lib/libpython2.6.so.1.0
#10 0x06027e4a in PyEval_EvalCodeEx () from /usr/lib/libpython2.6.so.1.0
#11 0x05fb6278 in ?? () from /usr/lib/libpython2.6.so.1.0
#12 0x05f8980d in PyObject_Call () from /usr/lib/libpython2.6.so.1.0
#13 0x05f9f7c4 in ?? () from /usr/lib/libpython2.6.so.1.0
#14 0x05f8980d in PyObject_Call () from /usr/lib/libpython2.6.so.1.0
#15 0x06021025 in PyEval_CallObjectWithKeywords () from /usr/lib/libpython2.6.so.1.0
#16 0x084e547f in ?? () from /usr/lib/python2.6/site-packages/sip.so
#17 0x014287d3 in ?? () from /usr/lib/python2.6/site-packages/PyQt4/QtCore.so
#18 0x014288ca in ?? () from /usr/lib/python2.6/site-packages/PyQt4/QtCore.so
#19 0x0142898d in ?? () from /usr/lib/python2.6/site-packages/PyQt4/QtCore.so
#20 0x029cbc0c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#21 0x029cc843 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#22 0x02a062f8 in QTimer::timeout() () from /usr/lib/libQtCore.so.4
#23 0x029d132e in QTimer::timerEvent(QTimerEvent*) () from /usr/lib/libQtCore.so.4
#24 0x01352a0c in ?? () from /usr/lib/python2.6/site-packages/PyQt4/QtCore.so
#25 0x029c5d3f in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#26 0x0135296c in ?? () from /usr/lib/python2.6/site-packages/PyQt4/QtCore.so
#27 0x030d3b24 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#28 0x030db281 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#29 0x03b6302b in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#30 0x029b5d73 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#31 0x029e32be in ?? () from /usr/lib/libQtCore.so.4
#32 0x029e0c21 in ?? () from /usr/lib/libQtCore.so.4
#33 0x00bf3118 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#34 0x00bf6a48 in ?? () from /lib/libglib-2.0.so.0
#35 0x00bf6b74 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#36 0x029e0b6d in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0x03173356 in ?? () from /usr/lib/libQtGui.so.4
#38 0x029b42aa in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#39 0x029b470a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#40 0x029b6bf7 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#41 0x030d39a8 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#42 0x044725e7 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#43 0x080486fc in _start ()

Reported using DrKonqi