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 2.6.31-20-generic-pae i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Crash happen when I've remove the Launchpad manager plasmoid.

 -- Backtrace:
Application: Espace de travail Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb56ce700 (LWP 2357))]

Thread 3 (Thread 0xa5691b70 (LWP 2386)):
#0  0xb7703430 in __kernel_vsyscall ()
#1  0xb5e27142 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb5feb8d4 in pthread_cond_timedwait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb750081e in ?? () from /usr/lib/libQtCore.so.4
#4  0xb7500973 in QThread::msleep(unsigned long) () from /usr/lib/libQtCore.so.4
#5  0xa876376b in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#6  0xb7500e32 in ?? () from /usr/lib/libQtCore.so.4
#7  0xb5e2280e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0xb5fde8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa4cffb70 (LWP 2401)):
#0  0xb7703430 in __kernel_vsyscall ()
#1  0xb5e26e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb5feb87d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7501e67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0xb5d38922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb7500e32 in ?? () from /usr/lib/libQtCore.so.4
#6  0xb5e2280e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb5fde8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb56ce700 (LWP 2357)):
[KCrash Handler]
#6  0xb686e18a in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#7  0xb68a7527 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0xb626af54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0xb627267c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0xb6cbabfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0xb75f16cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0xb68b85e7 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0xb6710a95 in ?? () from /usr/lib/libQtGui.so.4
#14 0xb75f083a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0xb626af2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0xb62725ca in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb6cbabfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0xb75f16cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0xb62bfad5 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0xb666f633 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0xb670efaa in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0xb68b8406 in QGraphicsView::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0xb626af54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0xb62725ca in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0xb6cbabfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0xb75f16cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0xb6275df6 in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#28 0xb62df21f in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#29 0xb630c502 in ?? () from /usr/lib/libQtGui.so.4
#30 0xb5e6ee88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0xb5e72730 in ?? () from /lib/libglib-2.0.so.0
#32 0xb5e72863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0xb761c02c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0xb630bbe5 in ?? () from /usr/lib/libQtGui.so.4
#35 0xb75efc79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0xb75f00ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0xb75f253f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0xb626add7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0xb41fa80d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804dde1 in _start ()

Reported using DrKonqi