Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-16-generic i686

What I was doing when the application crashed:
Mark text in firefox.
After that click the middle mouse button on dektop 
--> crash

 -- Backtrace:
Application: Plasma-Arbeitsfläche (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 14540)]

Thread 2 (Thread 0xac34db90 (LWP 14543)):
#0  0x009578f0 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x05d25a9d in pthread_cond_wait () from /lib/libc.so.6
#2  0x00249722 in QWaitCondition::wait (this=0x8b0de20, mutex=0x8b0de1c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#3  0x069b6092 in QHostInfoAgent::run (this=0x8b0de10) at kernel/qhostinfo.cpp:260
#4  0x00248712 in QThreadPrivate::start (arg=0x8b0de10) at thread/qthread_unix.cpp:188
#5  0x00953f3b in start_thread () from /lib/libpthread.so.0
#6  0x05d19bee in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb773b6c0 (LWP 14540)):
[KCrash Handler]
#5  QMimeDataPrivate::retrieveTypedData (this=0x17518d3, format=@0x8e26534, type=QVariant::ByteArray) at kernel/qmimedata.cpp:107
#6  0x00349701 in QMimeData::data (this=0x8fa43f0, mimeType=@0x8e26534) at kernel/qmimedata.cpp:524
#7  0x075b0be4 in Plasma::ContainmentPrivate::dropData (this=0x8aa91a0, event=0xbfc9ddb4) at ../../plasma/containment.cpp:1215
#8  0x075b11da in Plasma::Containment::mouseReleaseEvent (this=0x8ab3420, event=0xbfc9ddb4) at ../../plasma/containment.cpp:499
#9  0x01f665f4 in QGraphicsItem::sceneEvent (this=0x8ab3428, event=0xbfc9ddb4) at graphicsview/qgraphicsitem.cpp:5025
#10 0x01fb6d8f in QGraphicsWidget::sceneEvent (this=0x8ab3420, event=0xbfc9ddb4) at graphicsview/qgraphicswidget.cpp:1110
#11 0x01f8bbec in QGraphicsScenePrivate::sendEvent (this=0x8882548, item=0x8ab3428, event=0xbfc9ddb4) at graphicsview/qgraphicsscene.cpp:1159
#12 0x01f8d252 in QGraphicsScenePrivate::sendMouseEvent (this=0x8882548, mouseEvent=0xbfc9ddb4) at graphicsview/qgraphicsscene.cpp:1230
#13 0x01f97851 in QGraphicsScene::mouseReleaseEvent (this=0x888ea48, mouseEvent=0xbfc9ddb4) at graphicsview/qgraphicsscene.cpp:4445
#14 0x01f994aa in QGraphicsScene::event (this=0x888ea48, event=0xbfc9ddb4) at graphicsview/qgraphicsscene.cpp:3808
#15 0x0195d99c in QApplicationPrivate::notify_helper (this=0x87f7e58, receiver=0x888ea48, e=0xbfc9ddb4) at kernel/qapplication.cpp:4056
#16 0x01965c9e in QApplication::notify (this=0x879b8f8, receiver=0x888ea48, e=0xbfc9ddb4) at kernel/qapplication.cpp:3603
#17 0x00e6eecd in KApplication::notify (this=0x879b8f8, receiver=0x888ea48, event=0xbfc9ddb4) at ../../kdeui/kernel/kapplication.cpp:302
#18 0x0033c12b in QCoreApplication::notifyInternal (this=0x879b8f8, receiver=0x888ea48, event=0xbfc9ddb4) at kernel/qcoreapplication.cpp:610
#19 0x01fabb42 in QGraphicsView::mouseReleaseEvent (this=0x8bc3c28, event=0xbfc9e47c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#20 0x019b4563 in QWidget::event (this=0x8bc3c28, event=0xbfc9e47c) at kernel/qwidget.cpp:7549
#21 0x01d61093 in QFrame::event (this=0x8bc3c28, e=0xbfc9e47c) at widgets/qframe.cpp:559
#22 0x01e0114f in QAbstractScrollArea::viewportEvent (this=0x8bc3c28, e=0xbfc9d2c4) at widgets/qabstractscrollarea.cpp:962
#23 0x01fabde2 in QGraphicsView::viewportEvent (this=0x8bc3c28, event=0xbfc9e47c) at graphicsview/qgraphicsview.cpp:2919
#24 0x01e03755 in QAbstractScrollAreaFilter::eventFilter (this=0x8be0c90, o=0x8be0870, e=0xbfc9e47c) at widgets/qabstractscrollarea_p.h:100
#25 0x0033b34a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x87f7e58, receiver=0x8be0870, event=0xbfc9e47c) at kernel/qcoreapplication.cpp:726
#26 0x0195d97a in QApplicationPrivate::notify_helper (this=0x87f7e58, receiver=0x8be0870, e=0xbfc9e47c) at kernel/qapplication.cpp:4052
#27 0x01966611 in QApplication::notify (this=0x879b8f8, receiver=0x8be0870, e=0xbfc9e47c) at kernel/qapplication.cpp:3758
#28 0x00e6eecd in KApplication::notify (this=0x879b8f8, receiver=0x8be0870, event=0xbfc9e47c) at ../../kdeui/kernel/kapplication.cpp:302
#29 0x0033c12b in QCoreApplication::notifyInternal (this=0x879b8f8, receiver=0x8be0870, event=0xbfc9e47c) at kernel/qcoreapplication.cpp:610
#30 0x0196567e in QApplicationPrivate::sendMouseEvent (receiver=0x8be0870, event=0xbfc9e47c, alienWidget=0x8be0870, nativeWidget=0x8bc3c28, buttonDown=0x21deac0, lastMouseReceiver=@0x21deac4)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#31 0x019d50b5 in QETWidget::translateMouseEvent (this=0x8bc3c28, event=0xbfc9fa2c) at kernel/qapplication_x11.cpp:4409
#32 0x019d453e in QApplication::x11ProcessEvent (this=0x879b8f8, event=0xbfc9fa2c) at kernel/qapplication_x11.cpp:3428
#33 0x019fee3a in x11EventSourceDispatch (s=0x87fa7a0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#34 0x007971d8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0x0079a873 in ?? () from /usr/lib/libglib-2.0.so.0
#36 0x087f9e90 in ?? ()
#37 0x00000000 in ?? ()

This bug may be a duplicate of or related to bug 206574

Reported using DrKonqi