Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.95 (KDE 4.2.95 (KDE 4.3 RC1))
Qt Version: 4.5.2
Operating System: Linux 2.6.31-2-generic i686
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
While trying to troubleshoot wireless networking I restarted network-manager:

sudo sh /etc/init.d/NetworkManager restart

plasma crashed immediately.

Kubuntu KDE 4.3 RC1 packages

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7f3e930 (LWP 2936))]

Thread 2 (Thread 0xace79b90 (LWP 2938)):
#0  0x006d6422 in __kernel_vsyscall ()
#1  0x006250e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0341755d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x00167df7 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x013878e2 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x00166dc2 in ?? () from /usr/lib/libQtCore.so.4
#6  0x006214ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x0340870e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7f3e930 (LWP 2936)):
[KCrash Handler]
#6  0x01592522 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#7  0x015a5905 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#8  0x015903b3 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#9  0x0026d343 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#10 0x0026dfa2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#11 0x0158ee97 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#12 0x015942fc in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#13 0x0159481c in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#14 0x015a31f5 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#15 0x01590480 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#16 0x0026d343 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#17 0x0026dfa2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#18 0x01551173 in Solid::Control::NetworkManager::Notifier::networkInterfaceRemoved(QString const&) () from /usr/lib/libsolidcontrol.so.4
#19 0x01551bb6 in ?? () from /usr/lib/libsolidcontrol.so.4
#20 0x01551d05 in ?? () from /usr/lib/libsolidcontrol.so.4
#21 0x0026d343 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#22 0x0026dfa2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#23 0x0163fe43 in NMNetworkManager::networkInterfaceRemoved(QString const&) () from /usr/lib/kde4/solid_networkmanager07.so
#24 0x01642d15 in NMNetworkManager::deviceRemoved(QDBusObjectPath const&) () from /usr/lib/kde4/solid_networkmanager07.so
#25 0x016445ed in NMNetworkManager::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/kde4/solid_networkmanager07.so
#26 0x0026d343 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#27 0x0026dfa2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#28 0x01651a43 in ?? () from /usr/lib/kde4/solid_networkmanager07.so
#29 0x0165218d in ?? () from /usr/lib/kde4/solid_networkmanager07.so
#30 0x06f9b774 in ?? () from /usr/lib/libQtDBus.so.4
#31 0x06fa3157 in ?? () from /usr/lib/libQtDBus.so.4
#32 0x002676de in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#33 0x0373dc34 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#34 0x0374535c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#35 0x00e489ea in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#36 0x002577ab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#37 0x00258392 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#38 0x0025855d in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#39 0x002824df in ?? () from /usr/lib/libQtCore.so.4
#40 0x02ecebc8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#41 0x02ed2470 in ?? () from /usr/lib/libglib-2.0.so.0
#42 0x02ed25a3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#43 0x0028210c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#44 0x037de7a5 in ?? () from /usr/lib/libQtGui.so.4
#45 0x00255d59 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#46 0x002561aa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#47 0x0025861f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#48 0x0373dab7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#49 0x06074a7d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#50 0x0804dd78 in _start ()

Reported using DrKonqi