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 2.6.31-14-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
i was using Amarok,and then,immediately,the app bar has stopped,then restarted.

 -- Backtrace:
Application: Espace de travail Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7759700 (LWP 2423))]

Thread 2 (Thread 0xabf4ab70 (LWP 2514)):
#0  0x00728422 in __kernel_vsyscall ()
#1  0x00138e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0390d78d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x00861e67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x03f32922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x00860e32 in ?? () from /usr/lib/libQtCore.so.4
#6  0x0013480e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x039007ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7759700 (LWP 2423)):
[KCrash Handler]
#6  0x011993d3 in Plasma::ExtenderItem::config() const () from /usr/lib/libplasma.so.3
#7  0x0119b14d in Plasma::ExtenderItem::isGroup() const () from /usr/lib/libplasma.so.3
#8  0x011911af in Plasma::Extender::isEmpty() const () from /usr/lib/libplasma.so.3
#9  0x011aa516 in ?? () from /usr/lib/libplasma.so.3
#10 0x011aab53 in Plasma::PopupApplet::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libplasma.so.3
#11 0x015b4e3a in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0x00967263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#13 0x00967ec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x01218367 in Plasma::BusyWidget::clicked() () from /usr/lib/libplasma.so.3
#15 0x0121839d in Plasma::BusyWidget::mousePressEvent(QGraphicsSceneMouseEvent*) () from /usr/lib/libplasma.so.3
#16 0x0307c8d2 in QGraphicsItem::sceneEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#17 0x030c99ef in QGraphicsWidget::sceneEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#18 0x0309ee14 in ?? () from /usr/lib/libQtGui.so.4
#19 0x030a0443 in ?? () from /usr/lib/libQtGui.so.4
#20 0x030ac356 in ?? () from /usr/lib/libQtGui.so.4
#21 0x030acfa7 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x02a70f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#23 0x02a7867c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0x00e9bbfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#25 0x009516cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#26 0x030bae49 in QGraphicsView::mousePressEvent(QMouseEvent*) () from /usr/lib/libQtGui.so.4
#27 0x02ac5ff6 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#28 0x02e75633 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#29 0x02f14494 in QAbstractScrollArea::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#30 0x030be51f in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#31 0x02f16a95 in ?? () from /usr/lib/libQtGui.so.4
#32 0x0095083a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#33 0x02a70f2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#34 0x02a79033 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#35 0x00e9bbfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#36 0x009516cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#37 0x02a77f6e in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&) () from /usr/lib/libQtGui.so.4
#38 0x02ae67c0 in ?? () from /usr/lib/libQtGui.so.4
#39 0x02ae5c4b in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#40 0x02b12502 in ?? () from /usr/lib/libQtGui.so.4
#41 0x00761e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#42 0x00765720 in ?? () from /lib/libglib-2.0.so.0
#43 0x00765853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#44 0x0097c02c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#45 0x02b11be5 in ?? () from /usr/lib/libQtGui.so.4
#46 0x0094fc79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#47 0x009500ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#48 0x0095253f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#49 0x02a70dd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#50 0x013d480d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#51 0x0804dde1 in _start ()

Reported using DrKonqi