Version:            (using Devel)
Compiler:          g++ 4.1.3 
OS:                Linux
Installed from:    Compiled sources

1.
Trigger the "The 3/4 screen black background bug - when resizing the panel height" ( i.e., change the height of panel to about 2-3times its original height to trigger this bug)
 
2. Now, I restarted plasma from krunner but typing:
 kquitapp plasma & plasma
3. that quit plasma but didn't run another instance of plasma, so I ran krunner again and typed plasma
4. plasma loaded and I tried to unhide the system tray icons and had a plasma crash.

svn trunk info: kdelibs: 911779 kdebase: 911780 qt-copy: 911779

bt below:

Application: Plasma Workspace (plasma), signal SIGSEGV
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[New Thread -1265359136 (LWP 17121)]
[New Thread -1475142768 (LWP 17129)]
[New Thread -1466442864 (LWP 17125)]
[New Thread -1457816688 (LWP 17124)]
[Current thread is 0 (LWP 17121)]

Thread 4 (Thread -1457816688 (LWP 17124)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb6772676 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb67d5cc6 in QWaitCondition::wait (this=0x82ed468, mutex=0x82ed464, time=4294967295) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:82
#3  0xb799483d in QHostInfoAgent::run (this=0x82ed458) at /home/kde-devel/kdesvn/qt-copy/src/network/kernel/qhostinfo.cpp:241
#4  0xb67d52f3 in QThreadPrivate::start (arg=0x82ed458) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qthread_unix.cpp:185
#5  0xb676e46b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb65cf6de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 3 (Thread -1466442864 (LWP 17125)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb65c82a1 in select () from /lib/tls/i686/cmov/libc.so.6
#2  0xb6892adf in QProcessManager::run (this=0x8090ba0) at /home/kde-devel/kdesvn/qt-copy/src/corelib/io/qprocess_unix.cpp:301
#3  0xb67d52f3 in QThreadPrivate::start (arg=0x8090ba0) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qthread_unix.cpp:185
#4  0xb676e46b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5  0xb65cf6de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread -1475142768 (LWP 17129)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb6772676 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb67d5cc6 in QWaitCondition::wait (this=0x823a178, mutex=0x823a174, time=4294967295) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:82
#3  0xa95dc5c6 in RenderThread::run (this=0x823a16c) at /home/kde-devel/kdesvn/kdebase/workspace/plasma/wallpapers/image/renderthread.cpp:91
#4  0xb67d52f3 in QThreadPrivate::start (arg=0x823a16c) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qthread_unix.cpp:185
#5  0xb676e46b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb65cf6de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread -1265359136 (LWP 17121)):
[KCrash Handler]
#6  0x411d311d in ?? ()
#7  0xb7e31820 in Plasma::ContainmentPrivate::focusApplet (this=0x8190630, applet=0x81baea0) at /home/kde-devel/kdesvn/kdelibs/plasma/containment.cpp:1389
#8  0xb7e19a73 in Plasma::Applet::focusInEvent (this=0x81baea0, event=0xbfaa11b8) at /home/kde-devel/kdesvn/kdelibs/plasma/applet.cpp:1365
#9  0xb6fdcf4d in QGraphicsItem::sceneEvent (this=0x81baea8, event=0xbfaa11b8) at /home/kde-devel/kdesvn/qt-copy/src/gui/graphicsview/qgraphicsitem.cpp:3965
#10 0xb701a55f in QGraphicsWidget::sceneEvent (this=0x81baea0, event=0xbfaa11b8) at /home/kde-devel/kdesvn/qt-copy/src/gui/graphicsview/qgraphicswidget.cpp:1011
#11 0xb6ff38b4 in QGraphicsScenePrivate::sendEvent (this=0x8101d58, item=0x81baea8, event=0xbfaa11b8) at /home/kde-devel/kdesvn/qt-copy/src/gui/graphicsview/qgraphicsscene.cpp:1030
#12 0xb6ff8348 in QGraphicsScene::setFocusItem (this=0x80895d8, item=0x81baea8, focusReason=Qt::MouseFocusReason) at /home/kde-devel/kdesvn/qt-copy/src/gui/graphicsview/qgraphicsscene.cpp:2623
#13 0xb7000e14 in QGraphicsScenePrivate::mousePressEventHandler (this=0x8101d58, mouseEvent=0xbfaa1764) at /home/kde-devel/kdesvn/qt-copy/src/gui/graphicsview/qgraphicsscene.cpp:1142
#14 0xb70014ab in QGraphicsScene::mousePressEvent (this=0x80895d8, mouseEvent=0xbfaa1764) at /home/kde-devel/kdesvn/qt-copy/src/gui/graphicsview/qgraphicsscene.cpp:3545
#15 0xb700016b in QGraphicsScene::event (this=0x80895d8, event=0xbfaa1764) at /home/kde-devel/kdesvn/qt-copy/src/gui/graphicsview/qgraphicsscene.cpp:2963
#16 0xb6ad877f in QApplicationPrivate::notify_helper (this=0x808d938, receiver=0x80895d8, e=0xbfaa1764) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication.cpp:3803
#17 0xb6adf199 in QApplication::notify (this=0x806c148, receiver=0x80895d8, e=0xbfaa1764) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication.cpp:3393
#18 0xb7724a8a in KApplication::notify (this=0x806c148, receiver=0x80895d8, event=0xbfaa1764) at /home/kde-devel/kdesvn/kdelibs/kdeui/kernel/kapplication.cpp:307
#19 0xb68ae119 in QCoreApplication::notifyInternal (this=0x806c148, receiver=0x80895d8, event=0xbfaa1764) at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qcoreapplication.cpp:583
#20 0xb701351b in QGraphicsView::mousePressEvent (this=0x841c030, event=0xbfaa1d7c) at ../../include/QtCore/../../../../qt-copy/src/corelib/kernel/qcoreapplication.h:209
#21 0xb6b22f5c in QWidget::event (this=0x841c030, event=0xbfaa1d7c) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qwidget.cpp:7159
#22 0xb6e26963 in QFrame::event (this=0x841c030, e=0xbfaa1d7c) at /home/kde-devel/kdesvn/qt-copy/src/gui/widgets/qframe.cpp:651
#23 0xb6eac4dc in QAbstractScrollArea::viewportEvent (this=0x8a15918, e=0x821ce68) at /home/kde-devel/kdesvn/qt-copy/src/gui/widgets/qabstractscrollarea.cpp:943
#24 0xb7012358 in QGraphicsView::viewportEvent (this=0x841c030, event=0xbfaa1d7c) at /home/kde-devel/kdesvn/qt-copy/src/gui/graphicsview/qgraphicsview.cpp:2337
#25 0xb6ead6c5 in QAbstractScrollAreaFilter::eventFilter (this=0x841d4f8, o=0x841cc90, e=0xbfaa1d7c) at /home/kde-devel/kdesvn/qt-copy/src/gui/widgets/qabstractscrollarea_p.h:96
#26 0xb68ae6f9 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x808d938, receiver=0x841cc90, event=0xbfaa1d7c)
    at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qcoreapplication.cpp:694
#27 0xb6ad8759 in QApplicationPrivate::notify_helper (this=0x808d938, receiver=0x841cc90, e=0xbfaa1d7c) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication.cpp:3799
#28 0xb6adf3d1 in QApplication::notify (this=0x806c148, receiver=0x841cc90, e=0xbfaa1d7c) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication.cpp:3528
#29 0xb7724a8a in KApplication::notify (this=0x806c148, receiver=0x841cc90, event=0xbfaa1d7c) at /home/kde-devel/kdesvn/kdelibs/kdeui/kernel/kapplication.cpp:307
#30 0xb68ae119 in QCoreApplication::notifyInternal (this=0x806c148, receiver=0x841cc90, event=0xbfaa1d7c) at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qcoreapplication.cpp:583
#31 0xb6ade9d0 in QApplicationPrivate::sendMouseEvent (receiver=0x841cc90, event=0xbfaa1d7c, alienWidget=0x841cc90, nativeWidget=0x841c030, buttonDown=0xb7118c90, lastMouseReceiver=@0xb7118c94)
    at ../../include/QtCore/../../../../qt-copy/src/corelib/kernel/qcoreapplication.h:212
#32 0xb6b3ad5c in QETWidget::translateMouseEvent (this=0x841c030, event=0xbfaa2238) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication_x11.cpp:4044
#33 0xb6b3a226 in QApplication::x11ProcessEvent (this=0x806c148, event=0xbfaa2238) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication_x11.cpp:3040
#34 0xb6b5f5c4 in x11EventSourceDispatch (s=0x80905c0, callback=0, user_data=0x0) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qguieventdispatcher_glib.cpp:142
#35 0xb5aa711c in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#36 0xb5aaa55f in ?? () from /usr/lib/libglib-2.0.so.0
#37 0x0808fa98 in ?? ()
#38 0x00000000 in ?? ()