Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.96 (KDE 4.2.96 (KDE 4.3 RC2))
Qt Version: 4.5.2
Operating System: Linux 2.6.30-1-686 i686
Distribution: Debian GNU/Linux 5.0.2 (lenny)

What I was doing when the application crashed:
crash after many 3-4 clicks on tooltip cpu monitor  and desktop in kde 4.2.96

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5f856d0 (LWP 2892))]

Thread 2 (Thread 0xa94dcb90 (LWP 2893)):
#0  0xb7f5f424 in __kernel_vsyscall ()
#1  0xb668df65 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i686/cmov/libpthread.so.0
#2  0xb686678d in pthread_cond_wait () from /lib/i686/cmov/libc.so.6
#3  0xb7d68502 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0xb65b263a in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb7d67522 in ?? () from /usr/lib/libQtCore.so.4
#6  0xb668a4b5 in start_thread () from /lib/i686/cmov/libpthread.so.0
#7  0xb6857a4e in clone () from /lib/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5f856d0 (LWP 2892)):
[KCrash Handler]
#6  0xb70fe21a in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#7  0xb71379d7 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0xb6b057d4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0xb6b0d93e in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0xb754debd in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0xb7e5896b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0xb7149cc5 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0xb6fa34f5 in ?? () from /usr/lib/libQtGui.so.4
#14 0xb7e57b9a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0xb6b057ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0xb6b0da12 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb754debd in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0xb7e5896b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0xb6b5b215 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0xb6f01f03 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0xb6fa1a1d in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0xb7146946 in QGraphicsView::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0xb6b057d4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0xb6b0da12 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0xb754debd in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0xb7e5896b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0xb6b0c589 in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#28 0xb6b7ab02 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#29 0xb6ba5842 in ?? () from /usr/lib/libQtGui.so.4
#30 0xb66d7368 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb66da8c3 in ?? () from /usr/lib/libglib-2.0.so.0
#32 0xb66daa48 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0xb7e837f8 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0xb6ba4f85 in ?? () from /usr/lib/libQtGui.so.4
#35 0xb7e56fba in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0xb7e57402 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0xb7e59859 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0xb6b05657 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0xb4b40e90 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804e271 in _start ()

Reported using DrKonqi