Version:            (using KDE 4.2.1)
Compiler:          gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) 
OS:                Linux
Installed from:    Fedora RPMs

I installed KDE 4.2.1-3.FC10 from the kde-redhat kde-testing repository and plasma segfaults when KDE is starting up.

I tracked this down to what appears to be a bug in panelview.cpp:

PanelView::PanelView calls:

pinchContainment(screenRect);    (panelview.cpp:243)

pinchContainment calls QGraphicsWidget::resize which causes
Plasma::Containment::resizeEvent to fire. This in turn calls
Plasma::Applet::itemChange which indirectly calls
PanelView::updatePanelGeometry.

PanelView::updatePanelGeometry references m_strutsTimer
(panelview.cpp:543). But m_strutsTimer is initialised *after* the call
to pinchContainment in PanelView::PanelView.

The attached patch fixes the segfault. I've also attached a backtrace with debugging symbols.