Application that crashed: konsole
Version of the application: 2.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-ARCH i686

What I was doing when the application crashed:
I was at firefox when the internet stopped working. The pages wouldn't load. So I used the konsole to make the network down. 'sudo ifconfig ra0 down'. It didn't work, the command was handling and I could do nothing more on that terminal. I opened another, I tried to reboot and the same happened. I tried to exit X and other stuff, but after all, I ended up by pushing the power button to shutdown linux. I'm not sure if this helps, but my internet drivers are rt2870sta. When I installed them, they were unstable.

 -- Backtrace:
Application: Konsole (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  0xb487c39d in Konsole::ViewContainer::views () from /usr/lib/libkonsoleprivate.so
#7  0xb4882a95 in Konsole::ViewManager::viewProperties () from /usr/lib/libkonsoleprivate.so
#8  0xb5affc4d in Konsole::MainWindow::queryClose () from /usr/lib/libkdeinit4_konsole.so
#9  0xb7681901 in KMainWindow::closeEvent () from /usr/lib/libkdeui.so.5
#10 0xb6bab906 in QWidget::event () from /usr/lib/libQtGui.so.4
#11 0xb6f6fea7 in QMainWindow::event () from /usr/lib/libQtGui.so.4
#12 0xb767eee4 in KMainWindow::event () from /usr/lib/libkdeui.so.5
#13 0xb76c578f in KXmlGuiWindow::event () from /usr/lib/libkdeui.so.5
#14 0xb6b576c4 in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#15 0xb6b5ecfa in QApplication::notify () from /usr/lib/libQtGui.so.4
#16 0xb7599faa in KApplication::notify () from /usr/lib/libkdeui.so.5
#17 0xb7ecafab in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#18 0xb6bb1496 in QWidgetPrivate::close_helper () from /usr/lib/libQtGui.so.4
#19 0xb6bb946b in QApplication::x11ClientMessage () from /usr/lib/libQtGui.so.4
#20 0xb6bcaa16 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#21 0xb6bf5c22 in ?? () from /usr/lib/libQtGui.so.4
#22 0xb6761d98 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#23 0xb67653e0 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#24 0xb6765513 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#25 0xb7ef56ac in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#26 0xb6bf5355 in ?? () from /usr/lib/libQtGui.so.4
#27 0xb7ec9559 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#28 0xb7ec99aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#29 0xb7ecbe1f in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#30 0xb6b57547 in QApplication::exec () from /usr/lib/libQtGui.so.4
#31 0xb5b02640 in kdemain () from /usr/lib/libkdeinit4_konsole.so
#32 0x0804de22 in _start ()

Reported using DrKonqi