Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-ARCH x86_64

What I was doing when the application crashed:
When I checked Media Player Plugin (Phonon based media preview plugin) to load in kTorrent 3.2.2 Plasma suddenly crashed.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 2468)]

Thread 2 (Thread 0x7f55f3345910 (LWP 2469)):
#0  0x00007f5611d97dd9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f561200734b in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007f560e47644c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007f5612006285 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007f5611d9357a in start_thread () from /lib/libpthread.so.0
#5  0x00007f560f75216d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f56125be760 (LWP 2468)):
[KCrash Handler]
#5  0x00007f560980e734 in Plasma::ExtenderItem::group () from /usr/lib/libplasma.so.3
#6  0x00007f560980cf48 in Plasma::ExtenderGroup::items () from /usr/lib/libplasma.so.3
#7  0x00007f55f47f2093 in SystemTray::ExtenderTaskBusyWidget::updateTask () from /usr/lib/kde4/plasma_applet_systemtray.so
#8  0x00007f55f47f2a80 in SystemTray::ExtenderTaskBusyWidget::qt_metacall () from /usr/lib/kde4/plasma_applet_systemtray.so
#9  0x00007f5612100dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#10 0x00007f55f47f31c2 in SystemTray::Manager::notificationRemoved () from /usr/lib/kde4/plasma_applet_systemtray.so
#11 0x00007f55f47f4414 in SystemTray::Manager::qt_metacall () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0x00007f5612100dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#13 0x00007f55f47f5367 in SystemTray::Notification::destroyed () from /usr/lib/kde4/plasma_applet_systemtray.so
#14 0x00007f55f47f583b in SystemTray::Notification::~Notification () from /usr/lib/kde4/plasma_applet_systemtray.so
#15 0x00007f55f4802d4a in SystemTray::DBusNotification::~DBusNotification () from /usr/lib/kde4/plasma_applet_systemtray.so
#16 0x00007f56120fb12d in QObject::event () from /usr/lib/libQtCore.so.4
#17 0x00007f560fe8869c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#18 0x00007f560fe8f96e in QApplication::notify () from /usr/lib/libQtGui.so.4
#19 0x00007f5610abbff6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#20 0x00007f56120ebcec in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#21 0x00007f56120ec8ca in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#22 0x00007f5612114543 in ?? () from /usr/lib/libQtCore.so.4
#23 0x00007f560eddcdbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#24 0x00007f560ede0568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#25 0x00007f560ede0690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#26 0x00007f56121141b6 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#27 0x00007f560ff1b64e in ?? () from /usr/lib/libQtGui.so.4
#28 0x00007f56120ea5f2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#29 0x00007f56120ea9c4 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#30 0x00007f56120ecb79 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#31 0x00007f56067251ff in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#32 0x0000000000406eae in _start ()

Reported using DrKonqi