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-ARCH i686

What I was doing when the application crashed:
Add new panel on desktop and crash the plasma.

 -- Backtrace:
Application: Plasma-munkaterület (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb554d700 (LWP 2657))]

Thread 2 (Thread 0xa76deb70 (LWP 2658)):
#0  0xb7728424 in __kernel_vsyscall ()
#1  0xb74cbe65 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb752a067 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0xb5ce3f22 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb7529052 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb74c78ac in start_thread () from /lib/libpthread.so.0
#6  0xb5f60a9e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb554d700 (LWP 2657)):
[KCrash Handler]
#6  0xb67e6b0a in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#7  0xb681f607 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0xb61ee924 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0xb61f600c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0xb6c315ca in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0xb76175bb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0xb68306d7 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0xb6688fc5 in ?? () from /usr/lib/libQtGui.so.4
#14 0xb761676a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0xb61ee8fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0xb61f5f5a in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb6c315ca in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0xb76175bb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0xb6242c95 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0xb65e9253 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0xb66874ca in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0xb68304f6 in QGraphicsView::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0xb61ee924 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0xb61f5f5a in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0xb6c315ca in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0xb76175bb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0xb61f9706 in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#28 0xb626227f in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#29 0xb628cfd2 in ?? () from /usr/lib/libQtGui.so.4
#30 0xb5df5328 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb5df8ba0 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#32 0xb5df8cd3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0xb7641d25 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0xb628c705 in ?? () from /usr/lib/libQtGui.so.4
#35 0xb7615ba9 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0xb7615ffa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0xb761846f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0xb61ee7a7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0xb2df3b7d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804de42 in _start ()

Reported using DrKonqi