Since updating to KDE 4.9.80 (Git trunk from 2012-12-01), kdeinit4 crashes upon login with the following backtrace:

Application: KDE-Dienst (kdeinit4), signal: Aborted
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fae31f20780 (LWP 1604))]

Thread 3 (Thread 0x7fae16491700 (LWP 1611)):
#0  0x00007fae2f56513f in poll () from /lib64/libc.so.6
#1  0x00007fae2c2af684 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007fae2c2af7a4 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007fae30bb2cf6 in QEventDispatcherGlib::processEvents (this=0x7fae100008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fae30b8385f in QEventLoop::processEvents (this=this@entry=0x7fae16490dd0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fae30b83ae8 in QEventLoop::exec (this=0x7fae16490dd0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fae30a85fc0 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007fae30b63fcf in QInotifyFileSystemWatcherEngine::run (this=0x2526650) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fae30a88f9c in QThreadPrivate::start (arg=0x2526650) at thread/qthread_unix.cpp:338
#9  0x00007fae307f2e0e in start_thread () from /lib64/libpthread.so.0
#10 0x00007fae2f56d2bd in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fae01bf4700 (LWP 2035)):
#0  0x00007fae307f92ed in read () from /lib64/libpthread.so.0
#1  0x00007fae2c2ea82f in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007fae2c2af209 in g_main_context_check () from /usr/lib64/libglib-2.0.so.0
#3  0x00007fae2c2af622 in ?? () from /usr/lib64/libglib-2.0.so.0
#4  0x00007fae2c2af7a4 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#5  0x00007fae30bb2cf6 in QEventDispatcherGlib::processEvents (this=0x7fadf40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007fae30b8385f in QEventLoop::processEvents (this=this@entry=0x7fae01bf3e00, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fae30b83ae8 in QEventLoop::exec (this=0x7fae01bf3e00, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fae30a85fc0 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#9  0x00007fae30a88f9c in QThreadPrivate::start (arg=0x2736f10) at thread/qthread_unix.cpp:338
#10 0x00007fae307f2e0e in start_thread () from /lib64/libpthread.so.0
#11 0x00007fae2f56d2bd in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fae31f20780 (LWP 1604)):
[KCrash Handler]
#6  0x00007fae2f4bdd25 in raise () from /lib64/libc.so.6
#7  0x00007fae2f4bf1a8 in abort () from /lib64/libc.so.6
#8  0x00007fae2acc83b5 in _dbus_abort () at dbus-sysdeps.c:94
#9  0x00007fae2acbee65 in _dbus_warn_check_failed (format=0x7fae2acce7e0 "arguments to %s() were incorrect, assertion \"%s\" failed in file %s line %d.\nThis is normally a bug in some application using the D-Bus library.\n") at dbus-internals.c:290
#10 0x00007fae2acb14c6 in dbus_message_iter_append_basic (iter=0x7fff5b69b188, type=<optimized out>, value=0x7fff5b69aee8) at dbus-message.c:2586
#11 0x00007fae2d93ce7e in append (arg=..., this=0x7fff5b69b170) at qdbusmarshaller.cpp:130
#12 QDBusMarshaller::appendVariantInternal (this=0x7fff5b69b170, arg=...) at qdbusmarshaller.cpp:451
#13 0x00007fae2d917e08 in QDBusMessagePrivate::toDBusMessage (message=..., capabilities=..., error=0x7fff5b69b400) at qdbusmessage.cpp:189
#14 0x00007fae2d9073f3 in QDBusConnectionPrivate::send (this=this@entry=0x21b91c0, message=...) at qdbusintegrator.cpp:1846
#15 0x00007fae2d90de52 in QDBusConnectionPrivate::deliverCall (this=this@entry=0x21b91c0, object=object@entry=0x2859f60, msg=..., metaTypes=..., slotIdx=4) at qdbusintegrator.cpp:960
#16 0x00007fae2d90ec46 in QDBusConnectionPrivate::activateCall (this=this@entry=0x21b91c0, object=0x2859f60, flags=flags@entry=273, msg=...) at qdbusintegrator.cpp:850
#17 0x00007fae2d90f686 in QDBusConnectionPrivate::activateObject (this=0x21b91c0, node=..., msg=..., pathStartPos=<optimized out>) at qdbusintegrator.cpp:1423
#18 0x00007fae2d90f77b in QDBusActivateObjectEvent::placeMetaCall (this=0x27a8300) at qdbusintegrator.cpp:1537
#19 0x00007fae30b994ee in QObject::event (this=0x281d9a0, e=<optimized out>) at kernel/qobject.cpp:1204
#20 0x00007fae2fd1374c in QApplicationPrivate::notify_helper (this=this@entry=0x21ce150, receiver=receiver@entry=0x281d9a0, e=e@entry=0x27a8300) at kernel/qapplication.cpp:4557
#21 0x00007fae2fd17bca in QApplication::notify (this=0x7fff5b69c390, receiver=0x281d9a0, e=0x27a8300) at kernel/qapplication.cpp:4418
#22 0x00007fae3191f806 in KApplication::notify (this=0x7fff5b69c390, receiver=0x281d9a0, event=0x27a8300) at /usr/src/debug/kdelibs-4.9.80_20121201/kdeui/kernel/kapplication.cpp:311
#23 0x00007fae30b84b0e in QCoreApplication::notifyInternal (this=0x7fff5b69c390, receiver=receiver@entry=0x281d9a0, event=event@entry=0x27a8300) at kernel/qcoreapplication.cpp:915
#24 0x00007fae30b88471 in sendEvent (event=0x27a8300, receiver=0x281d9a0) at kernel/qcoreapplication.h:231
#25 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x21412b0) at kernel/qcoreapplication.cpp:1539
#26 0x00007fae30bb2b43 in sendPostedEvents () at kernel/qcoreapplication.h:236
#27 postEventSourceDispatch (s=0x21cc5b0) at kernel/qeventdispatcher_glib.cpp:279
#28 0x00007fae2c2af3b5 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#29 0x00007fae2c2af6e8 in ?? () from /usr/lib64/libglib-2.0.so.0
#30 0x00007fae2c2af7a4 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#31 0x00007fae30bb2cd6 in QEventDispatcherGlib::processEvents (this=0x2147790, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#32 0x00007fae2fdb3a5e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#33 0x00007fae30b8385f in QEventLoop::processEvents (this=this@entry=0x7fff5b69c110, flags=...) at kernel/qeventloop.cpp:149
#34 0x00007fae30b83ae8 in QEventLoop::exec (this=0x7fff5b69c110, flags=...) at kernel/qeventloop.cpp:204
#35 0x00007fae30b88788 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#36 0x00007fae1f0c0a30 in kdemain (argc=1, argv=0x21af0f0) at /usr/src/debug/kdelibs-4.9.80_20121201/kded/kded.cpp:924
#37 0x0000000000408856 in launch (argc=argc@entry=1, _name=_name@entry=0x40b243 "kded4", args=args@entry=0x0, cwd=cwd@entry=0x0, envc=envc@entry=0, envs=<optimized out>, envs@entry=0x0, reset_env=reset_env@entry=false, tty=tty@entry=0x0, avoid_loops=avoid_loops@entry=false, startup_id_str=startup_id_str@entry=0x40b0c6 "0") at /usr/src/debug/kdelibs-4.9.80_20121201/kinit/kinit.cpp:726
#38 0x0000000000405f99 in main (argc=4, argv=<optimized out>, envp=0x7fff5b69cd80) at /usr/src/debug/kdelibs-4.9.80_20121201/kinit/kinit.cpp:1841


Reproducible: Always

Steps to Reproduce:
Login into KDE
Actual Results:  
kdeinit4 crashes, killing kded (broken kwalletd, systray)

Expected Results:  
kded does not crash

Something seems to crash kded, but I do not get a clue from looking at the backtrace.