Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.26-1-686 i686
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
I don't know. I was working and ¡puf! desktop vanishes.  Then appears the bugreport and that's all.  I use Debian Squeeze. In time to time, plasma crashes in that way, but it is not constant. I don't know.  Time ago  (some months)  plasma was more stable.

 -- Backtrace:
Application: Área de trabajo de Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5f12920 (LWP 3266))]

Thread 2 (Thread 0xa929bb70 (LWP 3269)):
#0  0xb7f43424 in __kernel_vsyscall ()
#1  0xb66750a5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i686/cmov/libpthread.so.0
#2  0xb683882d in pthread_cond_wait () from /lib/i686/cmov/libc.so.6
#3  0xb7d475c2 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0xb6588a9a in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb7d465e2 in ?? () from /usr/lib/libQtCore.so.4
#6  0xb6671585 in start_thread () from /lib/i686/cmov/libpthread.so.0
#7  0xb682b2be in clone () from /lib/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5f12920 (LWP 3266)):
[KCrash Handler]
#6  0xb70ce2aa in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#7  0xb7107b27 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0xb6ad6a94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0xb6adebee in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0xb752162d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0xb7e371eb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0xb7119e25 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0xb6f72b75 in ?? () from /usr/lib/libQtGui.so.4
#14 0xb7e3641a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0xb6ad6a6c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0xb6adecc2 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb752162d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0xb7e371eb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0xb6b2c4d5 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0xb6ed2543 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0xb6f7109d in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0xb7116aa6 in QGraphicsView::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0xb6ad6a94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0xb6adecc2 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0xb752162d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0xb7e371eb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0xb6add873 in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#28 0xb6b4c94a in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#29 0xb6b76bc2 in ?? () from /usr/lib/libQtGui.so.4
#30 0xb66bcb38 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0xb66c03d0 in ?? () from /lib/libglib-2.0.so.0
#32 0xb66c0503 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0xb7e62041 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0xb6b76305 in ?? () from /usr/lib/libQtGui.so.4
#35 0xb7e3583a in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0xb7e35c82 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0xb7e380d9 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0xb6ad6917 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0xb4ae25cd in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804e291 in _start ()

Reported using DrKonqi