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 x86_64

What I was doing when the application crashed:
Open the Desktop settings window and change the room type from "Desktop" to "Folder view".

 -- Backtrace:
Application: Рабочее пространство Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fddfd092760 (LWP 1663))]

Thread 2 (Thread 0x7fdddd32e710 (LWP 1664)):
#0  0x00007fddfc86a07c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fddfcad5c6b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#2  0x00007fddf8f50c9c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007fddfcad4ba5 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fddfc86581a in start_thread () from /lib/libpthread.so.0
#5  0x00007fddfa22e8cd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fddfd092760 (LWP 1663)):
[KCrash Handler]
#5  0x00007fddfaed2dc4 in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#6  0x00007fddfaed54f9 in QGraphicsItem::isWindow() const () from /usr/lib/libQtGui.so.4
#7  0x00007fddfaf08c49 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0x00007fddfa95507c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0x00007fddfa95c34e in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0x00007fddfb5888f6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0x00007fddfcbb9bfc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0x00007fddfaf1a3f6 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0x00007fddfcbb8f47 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#14 0x00007fddfa95504c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#15 0x00007fddfa95c34e in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0x00007fddfb5888f6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#17 0x00007fddfcbb9bfc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#18 0x00007fddfa9a3c7b in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#19 0x00007fddfacfcd26 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0x00007fddfad8ba59 in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0x00007fddfa95507c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x00007fddfa95c34e in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#23 0x00007fddfb5888f6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#24 0x00007fddfcbb9bfc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#25 0x00007fddfa95f6db in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#26 0x00007fddfa9c0bbe in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#27 0x00007fddfa9e896c in ?? () from /usr/lib/libQtGui.so.4
#28 0x00007fddf98b51fe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#29 0x00007fddf98b8bb8 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#30 0x00007fddf98b8ce0 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#31 0x00007fddfcbe2123 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#32 0x00007fddfa9e814e in ?? () from /usr/lib/libQtGui.so.4
#33 0x00007fddfcbb8532 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x00007fddfcbb8904 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#35 0x00007fddfcbbaab9 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#36 0x00007fddf074c28f in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#37 0x0000000000406eae in _start ()

Reported using DrKonqi