Application that crashed: kbluetooth4
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28.9-tuxonice i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Thinkpad series, Fn+F5, turn bluetooth on and off,  then crash.
after that I have to start kbluetooth4 again.

 -- Backtrace:
Application: KBluetooth4 - The KDE4 Bluetooth Framework (kbluetooth4), signal: Segmentation fault
[KCrash Handler]
#6  0x00000001 in ?? ()
#7  0xb743ed23 in ?? () from /usr/lib/libQtDBus.so.4
#8  0xb743f5e1 in ?? () from /usr/lib/libQtDBus.so.4
#9  0xb743fada in ?? () from /usr/lib/libQtDBus.so.4
#10 0xb73373b0 in QObject::event () from /usr/lib/libQtCore.so.4
#11 0xb732656b in QCoreApplication::event () from /usr/lib/libQtCore.so.4
#12 0xb6964679 in QApplication::event () from /usr/lib/libQtGui.so.4
#13 0xb695ed3c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#14 0xb696703e in QApplication::notify () from /usr/lib/libQtGui.so.4
#15 0xb7b685cd in KApplication::notify () from /usr/lib/libkdeui.so.5
#16 0xb7326bcb in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#17 0xb7327825 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#18 0xb7327a1d in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#19 0xb73526af in ?? () from /usr/lib/libQtCore.so.4
#20 0xb62a4b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#21 0xb62a80eb in ?? () from /usr/lib/libglib-2.0.so.0
#22 0xb62a8268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#23 0xb73522f8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#24 0xb6a00a75 in ?? () from /usr/lib/libQtGui.so.4
#25 0xb73251fa in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#26 0xb7325642 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#27 0xb7442fcc in ?? () from /usr/lib/libQtDBus.so.4
#28 0xb742c3c1 in QDBusConnection::call () from /usr/lib/libQtDBus.so.4
#29 0xb744ac6b in QDBusAbstractInterface::callWithArgumentList () from /usr/lib/libQtDBus.so.4
#30 0xb744ebbd in QDBusAbstractInterface::call () from /usr/lib/libQtDBus.so.4
#31 0x08066ce3 in _start ()

Reported using DrKonqi