Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.32-ARCH i686

What I was doing when the application crashed:
What happened:

- Started amarok after upgrading to 2.2.1-2  / Arch Linux i686
- Tried starting a last.fm radio station
- Amarok was unable to play even a single track from this stream with the
effect of more or less skipping each song after less than a second
- The plasma add-ons from amaroks context panel (Current track, lyrics,
wikipedia and video) were updated partially, e.g. for some tracks the 
lyrics were loaded, etc.
- Since Amarok did not stop this behaviour after stopping the playback
and clearing the playlist, I quit Amarok via the "quit" option in the context
menu of the systray icon

At this point, the crash happened.

I have no idea what caused the weird behaviour of amarok in the first place (being a reproducible behaviour, I will file a separate bug report against amarok regarding the problems with last.fm playback), but since the crash reporting assistant suggestst that the segfault originates from  within plasma, I hope this backtrack is useful to you.

Thanks a lot in advance & best regards
Martin 

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5764700 (LWP 1817))]

Thread 2 (Thread 0xa8949b70 (LWP 1821)):
#0  0xb7883424 in __kernel_vsyscall ()
#1  0xb7615e65 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb766f937 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0xb5eeb562 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb766e922 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb76118ac in start_thread () from /lib/libpthread.so.0
#6  0xb6168a9e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb5764700 (LWP 1817)):
[KCrash Handler]
#6  0xb541ec9c in Plasma::DataContainer::setData(QString const&, QVariant const&) () from /usr/lib/libplasma.so.3
#7  0xa89dd37d in PlayerContainer::updateInfo() () from /usr/lib/kde4/plasma_engine_nowplaying.so
#8  0xa89dd661 in PlayerContainer::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/kde4/plasma_engine_nowplaying.so
#9  0xb77728ac in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#10 0xb77734e2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#11 0xb541e5a3 in Plasma::DataContainer::updateRequested(Plasma::DataContainer*) () from /usr/lib/libplasma.so.3
#12 0xb544d7f0 in Plasma::SignalRelay::timerEvent(QTimerEvent*) () from /usr/lib/libplasma.so.3
#13 0xb776ca5f in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#14 0xb63e53a4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#15 0xb63eca8c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0xb6e285ca in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#17 0xb775ce8b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#18 0xb778a7ce in ?? () from /usr/lib/libQtCore.so.4
#19 0xb77878d7 in ?? () from /usr/lib/libQtCore.so.4
#20 0xb5ffd328 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#21 0xb6000ba0 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#22 0xb6000cd3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#23 0xb77875f5 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#24 0xb6483185 in ?? () from /usr/lib/libQtGui.so.4
#25 0xb775b479 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#26 0xb775b8ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#27 0xb775dd3f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#28 0xb63e5227 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#29 0xb420061d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#30 0x0804de22 in _start ()

Reported using DrKonqi