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 2.6.31-2-generic i686
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
mouse over a folder view plasma on desktop shows popup of unplugged, usb stick folder, (probably leftover) and crashes KDE.
Other folder popups work fine,

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7f2e930 (LWP 3761))]

Thread 2 (Thread 0xace23b90 (LWP 3764)):
#0  0x00bf0422 in __kernel_vsyscall ()
#1  0x00d980e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x00b7755d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x0015fdf7 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x06c0e8e2 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x0015edc2 in ?? () from /usr/lib/libQtCore.so.4
#6  0x00d944ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x00b6870e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7f2e930 (LWP 3761)):
[KCrash Handler]
#6  0x0452d738 in QGraphicsScene::drawItems(QPainter*, int, QGraphicsItem**, QStyleOptionGraphicsItem const*, QWidget*) () from /usr/lib/libQtGui.so.4
#7  0x0453b55c in QGraphicsView::drawItems(QPainter*, int, QGraphicsItem**, QStyleOptionGraphicsItem const*) () from /usr/lib/libQtGui.so.4
#8  0x0454827e in QGraphicsView::paintEvent(QPaintEvent*) () from /usr/lib/libQtGui.so.4
#9  0x03f4da34 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#10 0x042fcdc3 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#11 0x0439bc14 in QAbstractScrollArea::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#12 0x04545bbf in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0x0439e215 in ?? () from /usr/lib/libQtGui.so.4
#14 0x0024e91a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0x03ef8c0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0x03f002aa in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0x0118aa4a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0x0024f7ab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0x03f55a85 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/libQtGui.so.4
#20 0x03f562ad in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/libQtGui.so.4
#21 0x03f55676 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/libQtGui.so.4
#22 0x03f562ad in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/libQtGui.so.4
#23 0x03f55676 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/libQtGui.so.4
#24 0x040e3be8 in ?? () from /usr/lib/libQtGui.so.4
#25 0x03f46db6 in QWidgetPrivate::syncBackingStore() () from /usr/lib/libQtGui.so.4
#26 0x03f4de75 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#27 0x03ef8c34 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#28 0x03f002aa in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#29 0x0118aa4a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#30 0x0024f7ab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#31 0x00250392 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#32 0x0025055d in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#33 0x0027a4df in ?? () from /usr/lib/libQtCore.so.4
#34 0x00c34bc8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0x00c38470 in ?? () from /usr/lib/libglib-2.0.so.0
#36 0x00c385a3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#37 0x0027a10c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#38 0x03f997a5 in ?? () from /usr/lib/libQtGui.so.4
#39 0x0024dd59 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#40 0x0024e1aa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#41 0x0025061f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#42 0x03ef8ab7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#43 0x015cbb0d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#44 0x0804dde1 in _start ()

Reported using DrKonqi