Version:            (using KDE 4.2.2)
OS:                Linux
Installed from:    Debian testing/unstable Packages

Open konqueror. Go to Preferences->Configure Konqueror->Configure cookies->Policy, Select "Reject all cookies" (having them enabled) and accept.

Close konqueror. killall kded4, kstart kded4, open a blank konqueror

Go to Tools->HTML preferences->Cookies (as to enable them)

  I have this kded4 crash:

Aplicación: Servicio de KDE (kded4), señal SIGSEGV
0x00007f59368c88a0 in __nanosleep_nocancel () from /lib/libc.so.6
Current language:  auto; currently c

Thread 1 (Thread 0x7f5936e68750 (LWP 29230)):
[KCrash Handler]
#5  KCookieJar::setDomainAdvice (this=0x10c7080, _domain=@0x10c5678, _advice=KCookieAccept) at /usr/include/qt4/QtCore/qatomic_x86_64.h:117
#6  0x00007f592ab38b12 in KCookieServer::setDomainAdvice (this=0xe02f70, url=<value optimized out>, advice=<value optimized out>) at ../../../../kioslave/http/kcookiejar/kcookieserver.cpp:509
#7  0x00007f592ab41b26 in KCookieServerAdaptor::qt_metacall (this=0xea1300, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff3efa8110) at kcookieserveradaptor.cpp:129
#8  0x00007f5934f1ddb3 in QDBusConnectionPrivate::deliverCall (this=0xcde360, object=0xea1300, msg=@0xf9dd00, metaTypes=@0x7fff3efa83f8, slotIdx=19) at qdbusintegrator.cpp:849
#9  0x00007f5934f1efc4 in QDBusConnectionPrivate::activateCall (this=0xcde360, object=0xea1300, flags=497, msg=@0xf9dd00) at qdbusintegrator.cpp:754
#10 0x00007f5934f1f6a1 in QDBusConnectionPrivate::activateObject (this=0xcde360, node=@0xf9dcd8, msg=@0xf9dd00, pathStartPos=<value optimized out>) at qdbusintegrator.cpp:1283
#11 0x00007f5934f1f9b8 in QDBusActivateObjectEvent::placeMetaCall (this=0xf9dc90) at qdbusintegrator.cpp:1400
#12 0x00007f5936551355 in QObject::event (this=0xe02f70, e=0xf9dc90) at kernel/qobject.cpp:1155
#13 0x00007f5934571a5d in QApplicationPrivate::notify_helper (this=0xceb920, receiver=0xe02f70, e=0xf9dc90) at kernel/qapplication.cpp:3803
#14 0x00007f59345797da in QApplication::notify (this=0x7fff3efa8fc0, receiver=0xe02f70, e=0xf9dc90) at kernel/qapplication.cpp:3768
#15 0x00007f5935b8e55b in KApplication::notify (this=0x7fff3efa8fc0, receiver=0xe02f70, event=0xf9dc90) at ../../kdeui/kernel/kapplication.cpp:307
#16 0x00007f5936542391 in QCoreApplication::notifyInternal (this=0x7fff3efa8fc0, receiver=0xe02f70, event=0xf9dc90) at kernel/qcoreapplication.cpp:587
#17 0x00007f593654302a in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0xcc5d80) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:209
#18 0x00007f593656aa93 in postEventSourceDispatch (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:214
#19 0x00007f59337edf7a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#20 0x00007f59337f1640 in ?? () from /usr/lib/libglib-2.0.so.0
#21 0x00007f59337f17dc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#22 0x00007f593656a71f in QEventDispatcherGlib::processEvents (this=0xcebb50, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:319
#23 0x00007f593460347f in QGuiEventDispatcherGlib::processEvents (this=0x10c7080, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:198
#24 0x00007f5936540cb2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1056607936}) at kernel/qeventloop.cpp:143
#25 0x00007f5936540e3d in QEventLoop::exec (this=0x7fff3efa8f00, flags={i = 1056608016}) at kernel/qeventloop.cpp:194
#26 0x00007f59365432ed in QCoreApplication::exec () at kernel/qcoreapplication.cpp:845
#27 0x00007f5936b88b57 in kdemain (argc=1, argv=0x7fff3efa9378) at ../../kded/kded.cpp:937
#28 0x00007f59368485a6 in __libc_start_main (main=0x4006f0 <main>, argc=1, ubp_av=0x7fff3efa9378, init=0x400720 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fff3efa9368) at libc-start.c:222
#29 0x0000000000400629 in _start () at ../sysdeps/x86_64/elf/start.S:113