Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0) "release 155"
Qt Version: 4.5.2
Operating System: Linux 2.6.27.25-0.1-default i686

What I was doing when the application crashed:
I removed the traybar because it caused very high cpu load (Xorg around 70% and plasma-desktop around 29%). Removing that plasmoid bring back normal cpu usage. Then, next time that i closed yakuake (pressing F12), this happended

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5f78700 (LWP 3351))]

Thread 2 (Thread 0xa928ab90 (LWP 3469)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7dfcc35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb7e5c582 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0xb76d1ad2 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb7e5b572 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb7df91b5 in start_thread () from /lib/libpthread.so.0
#6  0xb66403be in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb5f78700 (LWP 3351)):
[KCrash Handler]
#6  0xb6efe5aa in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#7  0xb6f381a7 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0xb69177fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0xb691faee in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0xb740a27d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0xb7f5016b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0xb6f4a4f5 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0xb6da1e95 in ?? () from /usr/lib/libQtGui.so.4
#14 0xb7f4f37a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0xb69177da in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0xb691fbd2 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb740a27d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0xb7f5016b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0xb696dead in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0xb6cff5f3 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0xb6da038d in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0xb6f471a6 in QGraphicsView::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0xb69177fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0xb691fbd2 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0xb740a27d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0xb7f5016b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0xb691e6e1 in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#28 0xb698e20d in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#29 0xb69b85ea in ?? () from /usr/lib/libQtGui.so.4
#30 0xb64bd9c8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb64c1083 in ?? () from /usr/lib/libglib-2.0.so.0
#32 0xb64c1241 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0xb7f7b8d8 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0xb69b7ce5 in ?? () from /usr/lib/libQtGui.so.4
#35 0xb7f4e78a in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0xb7f4ebd2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0xb7f51079 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0xb6917677 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0xb49a5b30 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804e505 in _start ()

Reported using DrKonqi