Version:           SVN revision 791429 (using Devel)
Installed from:    Compiled sources
OS:                Linux

I was testing KDE4, built from the SVN sources. I was playing around with the widgets on the Plasma Panel. I removed all widgets from the panel, because I wanted to re-order them. When I added the 'System Tray' widget, Plasma crashed.

Backtrace:

Application: Plasma Workspace (plasma), signal SIGSEGV
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1249913120 (LWP 6222)]
[New Thread -1323734128 (LWP 6410)]
[New Thread -1279652976 (LWP 6226)]
[KCrash handler]
#6  0xb6926518 in QWidget::effectiveWinId (this=0x86125f0)
    at ../../include/QtGui/../../../../qt-copy/src/gui/kernel/qwidget.h:235
#7  0xb6947d52 in QApplication::x11ProcessEvent (this=0x8062278, 
    event=0xbfdadbe8)
    at /home/minnozz/kdesvn/qt-copy/src/gui/kernel/qapplication_x11.cpp:3354
#8  0xb696d754 in x11EventSourceDispatch (s=0x807e250, callback=0, 
    user_data=0x0)
    at /home/minnozz/kdesvn/qt-copy/src/gui/kernel/qguieventdispatcher_glib.cpp:148
#9  0xb634211c in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#10 0xb634555f in ?? () from /usr/lib/libglib-2.0.so.0
#11 0x0807d4d0 in ?? ()
#12 0x00000000 in ?? ()
#0  0xffffe410 in __kernel_vsyscall ()