Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-16-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
i have configured 2 multiple desktops with diferent plasmoids

 -- Backtrace:
Application: Área de Trabalho do Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7769700 (LWP 2384))]

Thread 2 (Thread 0xaa73bb70 (LWP 2475)):
#0  0x00355422 in __kernel_vsyscall ()
#1  0x00ca5e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x00c3178d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x004a4e67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x07cb0922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x004a3e32 in ?? () from /usr/lib/libQtCore.so.4
#6  0x00ca180e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x00c247ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7769700 (LWP 2384)):
[KCrash Handler]
#6  0x0751218a in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#7  0x0754b527 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0x06f0ef54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0x06f1667c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0x00fca1aa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0x005946cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0x0755c5e7 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0x073b4a95 in ?? () from /usr/lib/libQtGui.so.4
#14 0x0059383a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0x06f0ef2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0x06f165ca in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0x00fca1aa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0x005946cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0x06f63ad5 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0x07313633 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0x073b2faa in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x0755c406 in QGraphicsView::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0x06f0ef54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0x06f165ca in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0x00fca1aa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0x005946cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0x06f19df6 in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#28 0x06f8321f in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#29 0x06fb0502 in ?? () from /usr/lib/libQtGui.so.4
#30 0x002cfe78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0x002d3720 in ?? () from /lib/libglib-2.0.so.0
#32 0x002d3853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0x005bf02c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x06fafbe5 in ?? () from /usr/lib/libQtGui.so.4
#35 0x00592c79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0x005930ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0x0059553f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0x06f0edd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0x019e380d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804dde1 in _start ()

Reported using DrKonqi