Application that crashed: kbluetooth4
Version of the application: 0.3
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2))
Qt Version: 4.5.1
Operating System: Linux 2.6.30-9-generic i686
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
First I accidentally dragged a quick access plasmoid from the panel to the desktop. When the mouse went onto the panel again, this crash report showed up.

 -- Backtrace:
Application: KBluetooth4 - The KDE4 Bluetooth Framework (kbluetooth4), signal: Segmentation fault
[KCrash Handler]
#6  0x0300007b in ?? () from /usr/lib/libxml2.so.2
#7  0x006fdad6 in QDBusConnectionPrivate::activateCall (this=0x8a3a860, object=0x8a8f5a0, flags=273, msg=@0x8a421e0) at qdbusintegrator.cpp:753
#8  0x006fe704 in QDBusConnectionPrivate::activateObject (this=0x8a3a860, node=@0x8a421cc, msg=@0x8a421e0, pathStartPos=18) at qdbusintegrator.cpp:1352
#9  0x006fe9ca in QDBusActivateObjectEvent::placeMetaCall (this=0x8a421a0) at qdbusintegrator.cpp:1469
#10 0x0719aeee in QObject::event (this=0xbf8fc130, e=0x8a421a0) at kernel/qobject.cpp:1118
#11 0x0718a43b in QCoreApplication::event (this=0xbf8fc130, e=0x8a421a0) at kernel/qcoreapplication.cpp:1434
#12 0x05cf1746 in QApplication::event (this=0xbf8fc130, e=0x8a421a0) at kernel/qapplication.cpp:2318
#13 0x05cebc1c in QApplicationPrivate::notify_helper (this=0x89d2828, receiver=0xbf8fc130, e=0x8a421a0) at kernel/qapplication.cpp:4057
#14 0x05cf33f4 in QApplication::notify (this=0xbf8fc130, receiver=0xbf8fc130, e=0x8a421a0) at kernel/qapplication.cpp:4022
#15 0x003b904a in KApplication::notify (this=0xbf8fc130, receiver=0xbf8fc130, event=0x8a421a0) at ../../kdeui/kernel/kapplication.cpp:302
#16 0x0718ab1b in QCoreApplication::notifyInternal (this=0xbf8fc130, receiver=0xbf8fc130, event=0x8a421a0) at kernel/qcoreapplication.cpp:610
#17 0x0718b5e8 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x89b28b8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#18 0x0718b7bd in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#19 0x071b636f in postEventSourceDispatch (s=0x89d4920) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#20 0x04b84ad8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#21 0x04b88070 in ?? () from /usr/lib/libglib-2.0.so.0
#22 0x04b881a3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#23 0x071b5f9c in QEventDispatcherGlib::processEvents (this=0x89cce30, flags={i = 37}) at kernel/qeventdispatcher_glib.cpp:324
#24 0x05d8d975 in QGuiEventDispatcherGlib::processEvents (this=0x89cce30, flags={i = 37}) at kernel/qguieventdispatcher_glib.cpp:202
#25 0x071890a9 in QEventLoop::processEvents (this=0xbf8fb09c, flags=) at kernel/qeventloop.cpp:149
#26 0x071894f2 in QEventLoop::exec (this=0xbf8fb09c, flags={i = 5}) at kernel/qeventloop.cpp:200
#27 0x00701a41 in QDBusConnectionPrivate::sendWithReply (this=0x8aa4d70, message=@0xbf8fb21c, sendMode=2, timeout=-1) at qdbusintegrator.cpp:1787
#28 0x006eb60b in QDBusConnection::call (this=0x89d261c, message=@0x1, mode=145290656, timeout=-1) at qdbusconnection.cpp:516
#29 0x007093af in QDBusAbstractInterface::callWithArgumentList (this=0x8a7e5a8, mode=QDBus::BlockWithGui, method=@0xbf8fb394, args=@0xbf8fb2bc) at qdbusabstractinterface.cpp:402
#30 0x0070ce4f in QDBusAbstractInterface::call (this=0x8a7e5a8, mode=QDBus::BlockWithGui, method=@0xbf8fb394, arg1=@0xbf8fb37c, arg2=@0xbf8fb370, arg3=@0xbf8fb364, arg4=@0xbf8fb358, 
    arg5=@0xbf8fb34c, arg6=@0xbf8fb340, arg7=@0xbf8fb334, arg8=@0xbf8fb328) at qdbusabstractinterface.cpp:655
#31 0x08066ce3 in _start ()

Reported using DrKonqi