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 2.6.31-17-generic-pae i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
It does not happen all the time. Seems to happen spuriously.

 -- Backtrace:
Application: Área de trabajo de Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5760700 (LWP 2636))]

Thread 2 (Thread 0xa8917b70 (LWP 2639)):
#0  0xb779b430 in __kernel_vsyscall ()
#1  0xb5eaee15 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
#2  0xb607387d in __pthread_cond_wait (cond=0xa2fea38, mutex=0xa2fea20) at forward.c:139
#3  0xb758ee67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0xb5dc0922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb758de32 in ?? () from /usr/lib/libQtCore.so.4
#6  0xb5eaa80e in start_thread (arg=0xa8917b70) at pthread_create.c:300
#7  0xb60668de in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb5760700 (LWP 2636)):
[KCrash Handler]
#6  0xb68f618a in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#7  0xb692f527 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0xb62f2f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0xb62fa67c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0xb6d431aa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0xb767e6cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0xb69405e7 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0xb6798a95 in ?? () from /usr/lib/libQtGui.so.4
#14 0xb767d83a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0xb62f2f2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0xb62fa5ca in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb6d431aa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0xb767e6cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0xb6347ad5 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0xb66f7633 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0xb6796faa in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0xb6940406 in QGraphicsView::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0xb62f2f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0xb62fa5ca in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0xb6d431aa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0xb767e6cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0xb62fddf6 in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#28 0xb636721f in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#29 0xb6394502 in ?? () from /usr/lib/libQtGui.so.4
#30 0xb5ef6e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0xb5efa730 in ?? () from /lib/libglib-2.0.so.0
#32 0xb5efa863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0xb76a902c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0xb6393be5 in ?? () from /usr/lib/libQtGui.so.4
#35 0xb767cc79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0xb767d0ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0xb767f53f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0xb62f2dd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0xb42d080d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804dde1 in _start ()

Reported using DrKonqi