Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
when i add new widget kde crash

 -- Backtrace:
Application: Espace de travail Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb784f700 (LWP 1530))]

Thread 2 (Thread 0xac6a4b70 (LWP 1533)):
#0  0x0038e422 in __kernel_vsyscall ()
#1  0x0035fe15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x007e178d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x00df5e67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x008c6922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x00df4e32 in ?? () from /usr/lib/libQtCore.so.4
#6  0x0035b80e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x007d47ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb784f700 (LWP 1530)):
[KCrash Handler]
#6  0x029a918a in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#7  0x029e2527 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0x023a5f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0x023ad67c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0x011abbfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0x00ee56cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0x029f35e7 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0x0284ba95 in ?? () from /usr/lib/libQtGui.so.4
#14 0x00ee483a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0x023a5f2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0x023ad5ca in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0x011abbfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0x00ee56cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0x023faad5 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0x027aa633 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0x02849faa in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x029f3406 in QGraphicsView::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0x023a5f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0x023ad5ca in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0x011abbfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0x00ee56cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0x023b0df6 in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#28 0x0241a21f in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#29 0x02447502 in ?? () from /usr/lib/libQtGui.so.4
#30 0x002d8e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0x002dc720 in ?? () from /lib/libglib-2.0.so.0
#32 0x002dc853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0x00f1002c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x02446be5 in ?? () from /usr/lib/libQtGui.so.4
#35 0x00ee3c79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0x00ee40ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0x00ee653f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0x023a5dd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0x014c080d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804dde1 in _start ()

Reported using DrKonqi