Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.3 (KDE 4.3.3)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic-pae i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
sytem chrash when using sys monitor applet

 -- Backtrace:
Application: Spazio di lavoro di Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5790700 (LWP 1610))]

Thread 2 (Thread 0xa7942b70 (LWP 1613)):
#0  0xb77bb430 in __kernel_vsyscall ()
#1  0xb5eeae15 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
#2  0xb60ae78d in __pthread_cond_wait (cond=0x9281b28, mutex=0x9281b10) at forward.c:139
#3  0xb75c4e67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0xb5dfc922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb75c3e32 in ?? () from /usr/lib/libQtCore.so.4
#6  0xb5ee680e in start_thread (arg=0xa7942b70) at pthread_create.c:300
#7  0xb60a17ee in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb5790700 (LWP 1610)):
[KCrash Handler]
#6  0xb5505547 in Plasma::Containment::containmentType() const () from /usr/lib/libplasma.so.3
#7  0xa7c133c3 in ?? () from /usr/lib/kde4/plasma_applet_system-monitor.so
#8  0xa7c13d6d in ?? () from /usr/lib/kde4/plasma_applet_system-monitor.so
#9  0xa7c13ea8 in ?? () from /usr/lib/kde4/plasma_applet_system-monitor.so
#10 0xb76ca263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#11 0xb76caec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#12 0xb55a0239 in Plasma::PushButton::toggled(bool) () from /usr/lib/libplasma.so.3
#13 0xb55a1890 in Plasma::PushButton::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libplasma.so.3
#14 0xa7c15d4a in MonitorButton::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/kde4/plasma_applet_system-monitor.so
#15 0xb76ca263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#16 0xb76caec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#17 0xb69b9be9 in QAbstractButton::toggled(bool) () from /usr/lib/libQtGui.so.4
#18 0xb66e44f4 in QAbstractButton::setChecked(bool) () from /usr/lib/libQtGui.so.4
#19 0xb66e4680 in QAbstractButton::nextCheckState() () from /usr/lib/libQtGui.so.4
#20 0xb66e4163 in ?? () from /usr/lib/libQtGui.so.4
#21 0xb66e4431 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/libQtGui.so.4
#22 0xb6382012 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0xb66e23ee in QAbstractButton::event(QEvent*) () from /usr/lib/libQtGui.so.4
#24 0xb678c66d in QPushButton::event(QEvent*) () from /usr/lib/libQtGui.so.4
#25 0xb632cf54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#26 0xb6335033 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#27 0xb6d7d14a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#28 0xb76b46cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#29 0xb6333f6e in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&) () from /usr/lib/libQtGui.so.4
#30 0xb699a1b5 in ?? () from /usr/lib/libQtGui.so.4
#31 0xb69388bc in QGraphicsItem::sceneEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#32 0xb69859ef in QGraphicsWidget::sceneEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#33 0xb695ae14 in ?? () from /usr/lib/libQtGui.so.4
#34 0xb695c443 in ?? () from /usr/lib/libQtGui.so.4
#35 0xb6967344 in QGraphicsScene::mouseReleaseEvent(QGraphicsSceneMouseEvent*) () from /usr/lib/libQtGui.so.4
#36 0xb6968f87 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#37 0xb632cf54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#38 0xb633467c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#39 0xb6d7d14a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#40 0xb76b46cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#41 0xb697ab1e in QGraphicsView::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/libQtGui.so.4
#42 0xb6382012 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#43 0xb6731633 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#44 0xb67d0494 in QAbstractScrollArea::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#45 0xb697a51f in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#46 0xb67d2a95 in ?? () from /usr/lib/libQtGui.so.4
#47 0xb76b383a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#48 0xb632cf2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#49 0xb6335033 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#50 0xb6d7d14a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#51 0xb76b46cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#52 0xb6333f6e in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&) () from /usr/lib/libQtGui.so.4
#53 0xb63a27c0 in ?? () from /usr/lib/libQtGui.so.4
#54 0xb63a1c4b in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#55 0xb63ce502 in ?? () from /usr/lib/libQtGui.so.4
#56 0xb5f32e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#57 0xb5f36720 in ?? () from /lib/libglib-2.0.so.0
#58 0xb5f36853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#59 0xb76df02c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#60 0xb63cdbe5 in ?? () from /usr/lib/libQtGui.so.4
#61 0xb76b2c79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#62 0xb76b30ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#63 0xb76b553f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#64 0xb632cdd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#65 0xb336d80d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#66 0x0804dde1 in _start ()

Reported using DrKonqi