Application that crashed: kded4
Version of the application: $Id: kded.cpp 944898 2009-03-26 13:01:25Z dfaure $
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-0.199.rc8.git2.fc12.x86_64 x86_64

What I was doing when the application crashed:
Booted F12 alpha, started Firefox, after a minute or so, "Crash Reporting Assistant" poped up. This had been happening fairly often, sometimes KED but more often KDM, so I'd installed the KDM debug information package. Hopefully you'll find the backtrace usefull. This is the first crash 

Note that F12 is using the (unreleased) X-server 1.6.99-1, and lots of other poorly tested stuff, so you may not want to spend too much time on this now. (Although I do get random, non-fatal, crashes of Plasma on Fedora 11. Probably not related, and previously reported.)

 -- Backtrace:
Application: KDE Daemon (kdeinit4), signal: Aborted
[Current thread is 1 (Thread 0x7f533ad47820 (LWP 1734))]

Thread 2 (Thread 0x7f531988a710 (LWP 1926)):
#0  0xffffffffff60013b in ?? ()
#1  0x00007f5319889a60 in ?? ()
#2  0x00007fffcdfb0782 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 1 (Thread 0x7f533ad47820 (LWP 1734)):
[KCrash Handler]
#5  0x00007f5336f245f5 in raise () from /lib64/libc.so.6
#6  0x00007f5336f25dd5 in abort () from /lib64/libc.so.6
#7  0x00007f533a7711b4 in qt_message_output (msgType=QtFatalMsg, buf=<value optimized out>) at global/qglobal.cpp:2042
#8  0x00007f533a771306 in qFatal (msg=<value optimized out>) at global/qglobal.cpp:2241
#9  0x00007f532469c279 in QString PackageKit::Util::enumToString<PackageKit::Client>(int, char const*, QString const&) () from /usr/lib64/libpackagekit-qt.so.12
#10 0x00007f5324690985 in PackageKit::Client::getTimeSinceAction(PackageKit::Client::Action) () from /usr/lib64/libpackagekit-qt.so.12
#11 0x00007f53248c7d9a in ?? () from /usr/lib64/kde4/kded_kpackagekitd.so
#12 0x00007f53248c6dbc in QDBusMessage::type() const () at qdbusmessage.cpp:642
#13 0x00007f533a873acc in QMetaObject::activate (sender=0x1ea8850, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0xffffffffffffffff) at kernel/qobject.cpp:3112
#14 0x00007f533a86dace in QObject::event (this=0x1ea8850, e=0x6c6) at kernel/qobject.cpp:1074
#15 0x00007f5337baf6bc in QApplicationPrivate::notify_helper (this=0x1c8f250, receiver=0x1ea8850, e=0x7fffcdf4d3d0) at kernel/qapplication.cpp:4056
#16 0x00007f5337bb691e in QApplication::notify (this=0x7fffcdf4d720, receiver=0x1ea8850, e=0x7fffcdf4d3d0) at kernel/qapplication.cpp:4021
#17 0x00007f5338cbab46 in KApplication::notify (this=0x7fffcdf4d720, receiver=0x1ea8850, event=0x7fffcdf4d3d0) at /usr/src/debug/kdelibs-4.3.1/kdeui/kernel/kapplication.cpp:302
#18 0x00007f533a85e88c in QCoreApplication::notifyInternal (this=0x7fffcdf4d720, receiver=0x1ea8850, event=0x7fffcdf4d3d0) at kernel/qcoreapplication.cpp:610
#19 0x00007f533a889302 in sendEvent (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#20 QTimerInfoList::activateTimers (event=<value optimized out>, receiver=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:572
#21 0x00007f533a886cdd in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#22 0x00007f533662319e in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#23 0x00007f5336626b88 in ?? () from /lib64/libglib-2.0.so.0
#24 0x00007f5336626caa in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#25 0x00007f533a886c26 in QEventDispatcherGlib::processEvents (this=0x1c0d870, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#26 0x00007f5337c41fae in QGuiEventDispatcherGlib::processEvents (this=0x6c6, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#27 0x00007f533a85d1c2 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f533a85d594 in QEventLoop::exec (this=0x7fffcdf4d670, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007f533a85f729 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#30 0x00007f532b07d6db in kdemain (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdelibs-4.3.1/kded/kded.cpp:938
#31 0x00000000004068e8 in launch (argc=1, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=0, envs=<value optimized out>, reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x409de5 "0") at /usr/src/debug/kdelibs-4.3.1/kinit/kinit.cpp:677
#32 0x0000000000408800 in main (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>) at /usr/src/debug/kdelibs-4.3.1/kinit/kinit.cpp:1740

Reported using DrKonqi