Version:           4.1.96-48.7 (using Devel)
Installed from:    Compiled sources

I'm on kde 4.2 rc1 using opensuse factory repository. While trying to add system monitor widget to desktop, plasma crashed with following backtrace.

Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 1 (Thread 0xb51c2700 (LWP 20615))]

Thread 4 (Thread 0xa9caab90 (LWP 20624)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb649dc35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb64fd872 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0xb78f40d2 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb64fc85e in ?? () from /usr/lib/libQtCore.so.4
#5  0xb649a1b5 in start_thread () from /lib/libpthread.so.0
#6  0xb62dc38e in clone () from /lib/libc.so.6

Thread 3 (Thread 0xa9435b90 (LWP 20625)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb649dc35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb64fd872 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0xa9cfa72a in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#4  0xb64fc85e in ?? () from /usr/lib/libQtCore.so.4
#5  0xb649a1b5 in start_thread () from /lib/libpthread.so.0
#6  0xb62dc38e in clone () from /lib/libc.so.6

Thread 2 (Thread 0xa8c34b90 (LWP 21473)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb62d53e1 in select () from /lib/libc.so.6
#2  0xb65cbdc7 in ?? () from /usr/lib/libQtCore.so.4
#3  0xb64fc85e in ?? () from /usr/lib/libQtCore.so.4
#4  0xb649a1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb62dc38e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb51c2700 (LWP 20615)):
[KCrash Handler]
#6  0x0839d966 in ?? ()
#7  0xb7d6bd93 in Plasma::Applet::focusInEvent(QFocusEvent*) () from /usr/lib/libplasma.so.3
#8  0xb6dd7a4d in QGraphicsItem::sceneEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#9  0xb6e1af0f in QGraphicsWidget::sceneEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#10 0xb6df5d2c in ?? () from /usr/lib/libQtGui.so.4
#11 0xb6df67a0 in QGraphicsScene::setFocusItem(QGraphicsItem*, Qt::FocusReason) () from /usr/lib/libQtGui.so.4
#12 0xb6e000e4 in ?? () from /usr/lib/libQtGui.so.4
#13 0xb6dfef87 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#14 0xb685c8fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#15 0xb686475e in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0xb76438fd in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#17 0xb65ec961 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#18 0xb6e0c0ab in QGraphicsView::mousePressEvent(QMouseEvent*) () from /usr/lib/libQtGui.so.4
#19 0xb68b4a49 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0xb6beaa83 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0xb6c811bf in QAbstractScrollArea::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0xb6e0e4df in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0xb6c83765 in ?? () from /usr/lib/libQtGui.so.4
#24 0xb65ebb3a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#25 0xb685c8da in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#26 0xb6865111 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#27 0xb76438fd in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#28 0xb65ec961 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#29 0xb686439e in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&) () from /usr/lib/libQtGui.so.4
#30 0xb68ce716 in ?? () from /usr/lib/libQtGui.so.4
#31 0xb68cdac5 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#32 0xb68f608a in ?? () from /usr/lib/libQtGui.so.4
#33 0xb55d29a8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb55d6063 in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb55d6221 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb6616fb8 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0xb68f5785 in ?? () from /usr/lib/libQtGui.so.4
#38 0xb65eb01a in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#39 0xb65eb1da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#40 0xb65ed895 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#41 0xb685c777 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#42 0xb7ee2206 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#43 0x08048782 in _start ()