Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-ARCH x86_64

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 1843)]

Thread 2 (Thread 0x7f591dcc4910 (LWP 1844)):
#0  0x00007f593d07edd9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f593d2ee34b in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007f593975844c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007f593d2ed285 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007f593d07a57a in start_thread () from /lib/libpthread.so.0
#5  0x00007f593aa3414d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f593d8a4750 (LWP 1843)):
[KCrash Handler]
#5  0x00007f591f486cf8 in AbstractTaskItem::basicPreferredSize () from /usr/lib/kde4/plasma_applet_tasks.so
#6  0x00007f591f4831e5 in TaskItemLayout::maximumRows () from /usr/lib/kde4/plasma_applet_tasks.so
#7  0x00007f591f48bae7 in TaskGroupItem::optimumCapacity () from /usr/lib/kde4/plasma_applet_tasks.so
#8  0x00007f591f47ed20 in Tasks::adjustGroupingStrategy () from /usr/lib/kde4/plasma_applet_tasks.so
#9  0x00007f591f47ef38 in Tasks::constraintsEvent () from /usr/lib/kde4/plasma_applet_tasks.so
#10 0x00007f5934d9cd2c in Plasma::Applet::flushPendingConstraintsEvents () from /usr/lib/libplasma.so.3
#11 0x00007f5934d9d385 in Plasma::Applet::timerEvent () from /usr/lib/libplasma.so.3
#12 0x00007f593d3e1d93 in QObject::event () from /usr/lib/libQtCore.so.4
#13 0x00007f593b73a1bb in QGraphicsWidget::event () from /usr/lib/libQtGui.so.4
#14 0x00007f593b16a69c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#15 0x00007f593b17196e in QApplication::notify () from /usr/lib/libQtGui.so.4
#16 0x00007f593bd9e8d6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#17 0x00007f593d3d2cec in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#18 0x00007f593d3fe302 in ?? () from /usr/lib/libQtCore.so.4
#19 0x00007f593d3fb26d in ?? () from /usr/lib/libQtCore.so.4
#20 0x00007f593a0bedbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#21 0x00007f593a0c2568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#22 0x00007f593a0c2690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#23 0x00007f593d3fb1b6 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#24 0x00007f593b1fd64e in ?? () from /usr/lib/libQtGui.so.4
#25 0x00007f593d3d15f2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#26 0x00007f593d3d19c4 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#27 0x00007f593d3d3b79 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#28 0x00007f593129d28f in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#29 0x0000000000406eae in _start ()

Reported using DrKonqi