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:
Plasma crashed when I canceled a download in the system tray. It probably has something to do with the fact that I was dragging the notitifcation back a forth between the desktop before and after I canceled it.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 1508)]

Thread 2 (Thread 0x7f1d447f2910 (LWP 1511)):
#0  0x00007f1d63a43dd9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f1d63caec1b in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007f1d6012fa3c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007f1d63cadb55 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007f1d63a3f57a in start_thread () from /lib/libpthread.so.0
#5  0x00007f1d6140b14d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f1d64270750 (LWP 1508)):
[KCrash Handler]
#5  0x00007f1d5b7b7ac0 in Plasma::ExtenderItem::config () from /usr/lib/libplasma.so.3
#6  0x00007f1d5b7b96c2 in Plasma::ExtenderItem::isGroup () from /usr/lib/libplasma.so.3
#7  0x00007f1d5b7aff75 in Plasma::Extender::isEmpty () from /usr/lib/libplasma.so.3
#8  0x00007f1d5b7affd9 in Plasma::ExtenderPrivate::updateEmptyExtenderLabel () from /usr/lib/libplasma.so.3
#9  0x00007f1d5b7b0666 in Plasma::Extender::itemAddedEvent () from /usr/lib/libplasma.so.3
#10 0x00007f1d5b7af7b4 in Plasma::ExtenderPrivate::addExtenderItem () from /usr/lib/libplasma.so.3
#11 0x00007f1d5b7b9dff in Plasma::ExtenderItem::setExtender () from /usr/lib/libplasma.so.3
#12 0x00007f1d5b7ba6d1 in Plasma::ExtenderItem::returnToSource () from /usr/lib/libplasma.so.3
#13 0x00007f1d5b7ba870 in Plasma::ExtenderItem::qt_metacall () from /usr/lib/libplasma.so.3
#14 0x00007f1d5b7b5885 in Plasma::ExtenderGroup::qt_metacall () from /usr/lib/libplasma.so.3
#15 0x00007f1d63da86bc in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0x00007f1d5b80fde8 in Plasma::IconWidget::mouseReleaseEvent () from /usr/lib/libplasma.so.3
#17 0x00007f1d620b3f49 in QGraphicsItem::sceneEvent () from /usr/lib/libQtGui.so.4
#18 0x00007f1d620d96c9 in ?? () from /usr/lib/libQtGui.so.4
#19 0x00007f1d620e1bd5 in QGraphicsScene::mouseReleaseEvent () from /usr/lib/libQtGui.so.4
#20 0x00007f1d620e379f in QGraphicsScene::event () from /usr/lib/libQtGui.so.4
#21 0x00007f1d61b300cc in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#22 0x00007f1d61b3739e in QApplication::notify () from /usr/lib/libQtGui.so.4
#23 0x00007f1d627638d6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#24 0x00007f1d63d935bc in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#25 0x00007f1d620f5981 in QGraphicsView::mouseReleaseEvent () from /usr/lib/libQtGui.so.4
#26 0x00007f1d61b7eab0 in QWidget::event () from /usr/lib/libQtGui.so.4
#27 0x00007f1d61ed7cd6 in QFrame::event () from /usr/lib/libQtGui.so.4
#28 0x00007f1d620f53fb in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#29 0x00007f1d63d928d7 in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#30 0x00007f1d61b3009c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#31 0x00007f1d61b371e1 in QApplication::notify () from /usr/lib/libQtGui.so.4
#32 0x00007f1d627638d6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#33 0x00007f1d63d935bc in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#34 0x00007f1d61b36ab0 in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#35 0x00007f1d61b9c9e4 in ?? () from /usr/lib/libQtGui.so.4
#36 0x00007f1d61b9b6ba in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#37 0x00007f1d61bc389c in ?? () from /usr/lib/libQtGui.so.4
#38 0x00007f1d60a95dbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#39 0x00007f1d60a99568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#40 0x00007f1d60a99690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#41 0x00007f1d63dbba86 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#42 0x00007f1d61bc307e in ?? () from /usr/lib/libQtGui.so.4
#43 0x00007f1d63d91ec2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#44 0x00007f1d63d92294 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#45 0x00007f1d63d94449 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#46 0x00007f1d57f1e28f in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#47 0x0000000000406eae in _start ()

Reported using DrKonqi