Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          gcc 4.3.0 (debian) -
OS:                Linux

I don't know why it crashed, but I've a backtrace:

Application: KDE Daemon (kded4), signal SIGSEGV
[Thread debugging using libthread_db enabled]
[New Thread 0x7f84a06cd780 (LWP 21494)]
[KCrash handler]
#5  0x00007f849e606a2b in QString::size (this=0x25bdf10)
    at ../../include/QtCore/../../src/corelib/tools/qstring.h:106
#6  0x00007f849e63861a in QString::operator== (this=0x25bdf10, 
    other=@0x7fffa8808010) at tools/qstring.cpp:1760
#7  0x00007f84a004e4e0 in KDirWatchPrivate::inotifyEventReceived (
    this=0x21c6330)
    at /home/kde4/development/kde4/kdelibs/kio/kio/kdirwatch.cpp:288
#8  0x00007f84a004eb46 in KDirWatchPrivate::qt_metacall (this=0x21c6330, 
    _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0x7fffa88082e0)
    at /home/kde4/development/kde/buildkdelibs/kio/kdirwatch_p.moc:74
#9  0x00007f849e71a3ef in QMetaObject::activate (sender=0x21c69b0, 
    from_signal_index=4, to_signal_index=4, argv=0x7fffa88082e0)
    at kernel/qobject.cpp:3001
#10 0x00007f849e71a9c1 in QMetaObject::activate (sender=0x21c69b0, 
    m=0x7f849ea28540, local_signal_index=0, argv=0x7fffa88082e0)
    at kernel/qobject.cpp:3071
#11 0x00007f849e765752 in QSocketNotifier::activated (this=0x21c69b0, _t1=9)
    at .moc/debug-shared/moc_qsocketnotifier.cpp:81
#12 0x00007f849e7248eb in QSocketNotifier::event (this=0x21c69b0, 
    e=0x7fffa8808b10) at kernel/qsocketnotifier.cpp:326
#13 0x00007f849ba11197 in QApplicationPrivate::notify_helper (this=0x217a9e0, 
    receiver=0x21c69b0, e=0x7fffa8808b10) at kernel/qapplication.cpp:3772
#14 0x00007f849ba114b3 in QApplication::notify (this=0x7fffa8808f90, 
    receiver=0x21c69b0, e=0x7fffa8808b10) at kernel/qapplication.cpp:3366
#15 0x00007f849fb21146 in KApplication::notify (this=0x7fffa8808f90, 
    receiver=0x21c69b0, event=0x7fffa8808b10)
    at /home/kde4/development/kde4/kdelibs/kdeui/kernel/kapplication.cpp:311
#16 0x00007f849e700f44 in QCoreApplication::notifyInternal (
    this=0x7fffa8808f90, receiver=0x21c69b0, event=0x7fffa8808b10)
    at kernel/qcoreapplication.cpp:587
#17 0x00007f849e705bf1 in QCoreApplication::sendEvent (receiver=0x21c69b0, 
    event=0x7fffa8808b10)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#18 0x00007f849e738e00 in socketNotifierSourceDispatch (source=0x217e0e0)
    at kernel/qeventdispatcher_glib.cpp:111
#19 0x00007f84995a5102 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#20 0x00007f84995a83a6 in ?? () from /usr/lib/libglib-2.0.so.0
#21 0x00007f84995a883f in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#22 0x00007f849e737bee in QEventDispatcherGlib::processEvents (
    this=0x2168000, flags={i = -1467970304})
    at kernel/qeventdispatcher_glib.cpp:325
#23 0x00007f849bad139b in QGuiEventDispatcherGlib::processEvents (
    this=0x2168000, flags={i = -1467970208})
    at kernel/qguieventdispatcher_glib.cpp:204
#24 0x00007f849e6fd5d7 in QEventLoop::processEvents (this=0x7fffa8808e20, 
    flags={i = -1467970096}) at kernel/qeventloop.cpp:149
#25 0x00007f849e6fd7d4 in QEventLoop::exec (this=0x7fffa8808e20, flags=
      {i = -1467970000}) at kernel/qeventloop.cpp:200
#26 0x00007f849e7019c5 in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:845
#27 0x00007f849ba10ef4 in QApplication::exec ()
    at kernel/qapplication.cpp:3304
#28 0x00007f84a03e4230 in kdemain (argc=1, argv=0x7fffa8809328)
    at /home/kde4/development/kde4/kdelibs/kded/kded.cpp:847
#29 0x00000000004008e7 in main (argc=1, argv=0x7fffa8809328)
    at /home/kde4/development/kde/buildkdelibs/kded/kded4_dummy.cpp:3
#0  0x00007f849a7be1c0 in nanosleep () from /lib/libc.so.6