Version:            (using KDE 4.2.0)
OS:                Linux
Installed from:    Ubuntu Packages

Since i have kmail starting with my sysytem, when new mail have received during initial mail check, I guess that sound notification make kded crash.
Here is backtrace...

Програм: КДЕ демон (kded4), сигнал SIGABRT

Thread 1 (Thread 0xb61336c0 (LWP 11190)):
[KCrash Handler]
#6  0xb7ff6430 in __kernel_vsyscall ()
#7  0xb66b5880 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb66b7248 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb6a96795 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb6a96872 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb6a96915 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb6d617e9 in ?? () from /usr/lib/libkdecore.so.5
#13 0xb6d61d08 in ?? () from /usr/lib/libkdecore.so.5
#14 0xb6d63fd6 in ?? () from /usr/lib/libkdecore.so.5
#15 0xb6d4b0ca in KConfig::sync () from /usr/lib/libkdecore.so.5
#16 0xb6d53eff in KConfigGroup::sync () from /usr/lib/libkdecore.so.5
#17 0xb3d916e7 in ?? () from /usr/lib/kde4/kded_kssld.so
#18 0xb3d9228b in ?? () from /usr/lib/kde4/kded_kssld.so
#19 0xb6c9726e in ?? () from /usr/lib/libQtDBus.so.4
#20 0xb6c984a7 in ?? () from /usr/lib/libQtDBus.so.4
#21 0xb6c989b1 in ?? () from /usr/lib/libQtDBus.so.4
#22 0xb6c98eaa in ?? () from /usr/lib/libQtDBus.so.4
#23 0xb6b9e771 in QObject::event () from /usr/lib/libQtCore.so.4
#24 0xb70598ec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#25 0xb706172e in QApplication::notify () from /usr/lib/libQtGui.so.4
#26 0xb7b7906d in KApplication::notify () from /usr/lib/libkdeui.so.5
#27 0xb6b8ee61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#28 0xb6b8fae5 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#29 0xb6b8fcdd in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#30 0xb6bb982f in ?? () from /usr/lib/libQtCore.so.4
#31 0xb64616f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#32 0xb6464da3 in ?? () from /usr/lib/libglib-2.0.so.0
#33 0xb6464f61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#34 0xb6bb9478 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#35 0xb70f3ea5 in ?? () from /usr/lib/libQtGui.so.4
#36 0xb6b8d52a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#37 0xb6b8d6ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#38 0xb6b8fda5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#39 0xb7059767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#40 0xb7fbf608 in kdemain () from /usr/lib/libkdeinit4_kded4.so
#41 0x080486b2 in _start ()