Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-ARCH x86_64

What I was doing when the application crashed:
This happens after I try to add/remove a widgets to/from Desktop. It is not specific to any individual widget.

 -- Backtrace:
Application: Рабочее пространство Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3550)]

Thread 2 (Thread 0x7fc8d9cb8910 (LWP 3553)):
#0  0x00007fc8f9e11dd9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fc8fa08134b in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007fc8f64f044c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007fc8fa080285 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fc8f9e0d57a in start_thread () from /lib/libpthread.so.0
#5  0x00007fc8f77cc16d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fc8fa63a760 (LWP 3550)):
[KCrash Handler]
#5  0x00007fc8d77fae11 in QHash<QString, KSGRD::SensorAgent*>::findNode () from /usr/lib/libksgrd.so.4
#6  0x00007fc8d77f68fa in KSGRD::SensorManager::sendRequest () from /usr/lib/libksgrd.so.4
#7  0x00007fc8d7a07544 in Yasp::Engine::updateSourceEvent () from /usr/lib/kde4/yasp_engine.so
#8  0x00007fc8f178cc36 in Plasma::DataEnginePrivate::internalUpdateSource () from /usr/lib/libplasma.so.3
#9  0x00007fc8f178e468 in Plasma::DataEngine::qt_metacall () from /usr/lib/libplasma.so.3
#10 0x00007fc8d7a098d0 in Yasp::DataEngine::qt_metacall () from /usr/lib/kde4/yasp_engine.so
#11 0x00007fc8d7a058b0 in Yasp::Engine::qt_metacall () from /usr/lib/kde4/yasp_engine.so
#12 0x00007fc8fa17adec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#13 0x00007fc8f178ac52 in Plasma::DataContainer::updateRequested () from /usr/lib/libplasma.so.3
#14 0x00007fc8f17b6673 in Plasma::SignalRelay::timerEvent () from /usr/lib/libplasma.so.3
#15 0x00007fc8fa174d93 in QObject::event () from /usr/lib/libQtCore.so.4
#16 0x00007fc8f7f0269c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#17 0x00007fc8f7f0996e in QApplication::notify () from /usr/lib/libQtGui.so.4
#18 0x00007fc8f8b35ff6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#19 0x00007fc8fa165cec in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#20 0x00007fc8fa191302 in ?? () from /usr/lib/libQtCore.so.4
#21 0x00007fc8fa18e26d in ?? () from /usr/lib/libQtCore.so.4
#22 0x00007fc8f6e56dbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#23 0x00007fc8f6e5a568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#24 0x00007fc8f6e5a690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#25 0x00007fc8fa18e1b6 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#26 0x00007fc8f7f9564e in ?? () from /usr/lib/libQtGui.so.4
#27 0x00007fc8fa1645f2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#28 0x00007fc8fa1649c4 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#29 0x00007fc8fa166b79 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#30 0x00007fc8edd481ff in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#31 0x0000000000406eae in _start ()

Reported using DrKonqi