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

What I was doing when the application crashed:
I opened Konsole and moved it from screen one to screen two (not virtual desktops) after the right border of konsole broke screen ones border plasma crashed but restarted. Moving again and repeating same task did not cause a crash. 

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 1894)]

Thread 2 (Thread 0x7f2f0454a910 (LWP 1895)):
#0  0x00007f2f238fddd9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f2f23b6d34b in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007f2f1ffd744c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007f2f23b6c285 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007f2f238f957a in start_thread () from /lib/libpthread.so.0
#5  0x00007f2f212b314d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f2f24123750 (LWP 1894)):
[KCrash Handler]
#5  0x00007f2f05d0ccf8 in AbstractTaskItem::basicPreferredSize () from /usr/lib/kde4/plasma_applet_tasks.so
#6  0x00007f2f05d091e5 in TaskItemLayout::maximumRows () from /usr/lib/kde4/plasma_applet_tasks.so
#7  0x00007f2f05d11ae7 in TaskGroupItem::optimumCapacity () from /usr/lib/kde4/plasma_applet_tasks.so
#8  0x00007f2f05d04d20 in Tasks::adjustGroupingStrategy () from /usr/lib/kde4/plasma_applet_tasks.so
#9  0x00007f2f05d04f38 in Tasks::constraintsEvent () from /usr/lib/kde4/plasma_applet_tasks.so
#10 0x00007f2f1b61bd2c in Plasma::Applet::flushPendingConstraintsEvents () from /usr/lib/libplasma.so.3
#11 0x00007f2f1b61c385 in Plasma::Applet::timerEvent () from /usr/lib/libplasma.so.3
#12 0x00007f2f23c60d93 in QObject::event () from /usr/lib/libQtCore.so.4
#13 0x00007f2f21fb91bb in QGraphicsWidget::event () from /usr/lib/libQtGui.so.4
#14 0x00007f2f219e969c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#15 0x00007f2f219f096e in QApplication::notify () from /usr/lib/libQtGui.so.4
#16 0x00007f2f2261d8d6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#17 0x00007f2f23c51cec in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#18 0x00007f2f23c7d302 in ?? () from /usr/lib/libQtCore.so.4
#19 0x00007f2f23c7a26d in ?? () from /usr/lib/libQtCore.so.4
#20 0x00007f2f2093ddbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#21 0x00007f2f20941568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#22 0x00007f2f20941690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#23 0x00007f2f23c7a1b6 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#24 0x00007f2f21a7c64e in ?? () from /usr/lib/libQtGui.so.4
#25 0x00007f2f23c505f2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#26 0x00007f2f23c509c4 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#27 0x00007f2f23c52b79 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#28 0x00007f2f17b1c28f in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#29 0x0000000000406eae in _start ()

This bug may be a duplicate of or related to bug 206677

Reported using DrKonqi