Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.98 (KDE 4.2.98 (KDE 4.3 RC3))
Qt Version: 4.5.1
Operating System: Linux 2.6.28-12-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
plasma crash after add a connection in "Manage network connections", after the crash everything works

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 5208)]

Thread 2 (Thread 0x7f03bb7d7950 (LWP 5211)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f03dbd8ece9 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007f03dac185dc in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007f03dbd8dd02 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007f03d7c5c3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f03d8840fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f03dc34d750 (LWP 5208)):
[KCrash Handler]
#5  0x00007f03bd76f57b in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#6  0x00007f03bd7809dc in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#7  0x00007f03bd76d700 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#8  0x00007f03dbe8c8d2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#9  0x00007f03bd7716f8 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#10 0x00007f03bd76d633 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#11 0x00007f03bd76d6a5 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#12 0x00007f03dbe8c8d2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#13 0x00007f03bd54c854 in NetworkManagerSettings::connectionAdded () from /usr/lib/libknmdbus.so.4
#14 0x00007f03bd54e1f3 in NetworkManagerSettings::onConnectionAdded () from /usr/lib/libknmdbus.so.4
#15 0x00007f03bd54e3f4 in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#16 0x00007f03dbe8c8d2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#17 0x00007f03bd54c282 in OrgFreedesktopNetworkManagerSettingsInterface::NewConnection () from /usr/lib/libknmdbus.so.4
#18 0x00007f03bd54c42c in OrgFreedesktopNetworkManagerSettingsInterface::qt_metacall () from /usr/lib/libknmdbus.so.4
#19 0x00007f03bd54e355 in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#20 0x00007f03da0fa433 in ?? () from /usr/lib/libQtDBus.so.4
#21 0x00007f03da101e1f in ?? () from /usr/lib/libQtDBus.so.4
#22 0x00007f03dbe86f28 in QObject::event () from /usr/lib/libQtCore.so.4
#23 0x00007f03d9417b9d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#24 0x00007f03d941fdea in QApplication::notify () from /usr/lib/libQtGui.so.4
#25 0x00007f03da55471b in KApplication::notify () from /usr/lib/libkdeui.so.5
#26 0x00007f03dbe76dfc in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#27 0x00007f03dbe77a6a in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#28 0x00007f03dbea08a3 in ?? () from /usr/lib/libQtCore.so.4
#29 0x00007f03d7eab20a in IA__g_main_context_dispatch (context=0x22c8c80) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#30 0x00007f03d7eae8e0 in g_main_context_iterate (context=0x22c8c80, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#31 0x00007f03d7eaea7c in IA__g_main_context_iteration (context=0x22c8c80, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#32 0x00007f03dbea052f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#33 0x00007f03d94b070f in ?? () from /usr/lib/libQtGui.so.4
#34 0x00007f03dbe756a2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#35 0x00007f03dbe75a6d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#36 0x00007f03dbe77d34 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#37 0x00007f03cfd9e6bb in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#38 0x0000000000407215 in _start ()

Reported using DrKonqi