Version:            (using KDE 4.2.1)
OS:                Linux
Installed from:    Fedora RPMs

Here's the following per your request "Please help us improve the software you use by filing a report at http://bugs.kde.org."

Application: KDE Daemon (kded4), signal SIGABRT
[Current thread is 1 (Thread 0xb7ef1770 (LWP 4380))]

Thread 3 (Thread 0xae2afb90 (LWP 4527)):
#0  0x005ee416 in __kernel_vsyscall ()
#1  0x007761f3 in __lll_lock_wait_private () from /lib/libc.so.6
#2  0x006f7cfd in _L_lock_4593 () from /lib/libc.so.6
#3  0x006f434a in free () from /lib/libc.so.6
#4  0x00cfb591 in operator delete () from /usr/lib/libstdc++.so.6
#5  0x052d275f in QEventDispatcherGlib::unregisterSocketNotifier () from /usr/lib/libQtCore.so.4
#6  0x052c285d in QSocketNotifier::setEnabled () from /usr/lib/libQtCore.so.4
#7  0x052d2b4f in ?? () from /usr/lib/libQtCore.so.4
#8  0x009f8e48 in g_main_context_check () from /lib/libglib-2.0.so.0
#9  0x009f97cd in ?? () from /lib/libglib-2.0.so.0
#10 0x009f9aa1 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#11 0x052d2817 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#12 0x052a688a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#13 0x052a6a4a in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#14 0x051b44d9 in QThread::exec () from /usr/lib/libQtCore.so.4
#15 0x0528abeb in ?? () from /usr/lib/libQtCore.so.4
#16 0x051b775e in ?? () from /usr/lib/libQtCore.so.4
#17 0x0083151f in start_thread () from /lib/libpthread.so.0
#18 0x0076704e in clone () from /lib/libc.so.6

Thread 2 (Thread 0xb1ed7b90 (LWP 4620)):
#0  0x005ee416 in __kernel_vsyscall ()
#1  0x0075f3d1 in select () from /lib/libc.so.6
#2  0x05287627 in ?? () from /usr/lib/libQtCore.so.4
#3  0x051b775e in ?? () from /usr/lib/libQtCore.so.4
#4  0x0083151f in start_thread () from /lib/libpthread.so.0
#5  0x0076704e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb7ef1770 (LWP 4380)):
[KCrash Handler]
#6  0x005ee416 in __kernel_vsyscall ()
#7  0x006ae460 in raise () from /lib/libc.so.6
#8  0x006afe28 in abort () from /lib/libc.so.6
#9  0x006ebfed in __libc_message () from /lib/libc.so.6
#10 0x006f23a4 in malloc_printerr () from /lib/libc.so.6
#11 0x006f4356 in free () from /lib/libc.so.6
#12 0x051b1fed in qFree () from /usr/lib/libQtCore.so.4
#13 0x05c91e30 in ?? () from /usr/lib/libkio.so.5
#14 0x05c8f3aa in ?? () from /usr/lib/libkio.so.5
#15 0x05c90d73 in ?? () from /usr/lib/libkio.so.5
#16 0x05c90e9b in ?? () from /usr/lib/libkio.so.5
#17 0x052bcdf0 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0x052bdb72 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0x052f7ac3 in QSocketNotifier::activated () from /usr/lib/libQtCore.so.4
#20 0x052c29c7 in QSocketNotifier::event () from /usr/lib/libQtCore.so.4
#21 0x0653b68c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#22 0x065434ce in QApplication::notify () from /usr/lib/libQtGui.so.4
#23 0x058a80fd in KApplication::notify () from /usr/lib/libkdeui.so.5
#24 0x052a81c1 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#25 0x052d2a8a in ?? () from /usr/lib/libQtCore.so.4
#26 0x009f6238 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#27 0x009f98e3 in ?? () from /lib/libglib-2.0.so.0
#28 0x009f9aa1 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#29 0x052d27f8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#30 0x065d4515 in ?? () from /usr/lib/libQtGui.so.4
#31 0x052a688a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#32 0x052a6a4a in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#33 0x052a9105 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#34 0x0653b507 in QApplication::exec () from /usr/lib/libQtGui.so.4
#35 0x00da3520 in kdemain () from /usr/lib/libkdeinit4_kded4.so
#36 0x08048692 in _start ()