Very strange crash related to plasma

[Bart Cerneels]

I'm using kubuntu-members-kde4 repos. Currently kde 4.2 rc1. I also
use markey's instructions to run amarok from $HOME.

I hope someone can help me, it's currently blocking development for me.

amarok: END__: void ScriptManager::findScripts() - Took 14s
amarok(17872) Plasma::Theme::wallpaperPath: exhausted every effort to
find a wallpaper.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fbc2b8f3700 (LWP 17872)]
0x00007fbc0bf2d47f in Plasma::PackageStructure::metadata () from
/usr/lib/libplasma.so.3
(gdb) bt
#0  0x00007fbc0bf2d47f in Plasma::PackageStructure::metadata () from
/usr/lib/libplasma.so.3
#1  0x00007fbc23a11c0f in Plasma::PackageStructure::setPath
(this=0x3022330, path=@0x31e1308)
    at /home/cerneelb/Code/amarok/src/context/plasma/packagestructure.cpp:320
#2  0x00007fbc23a18935 in Package (this=0x7fff3392e150,
packagePath=@0x1260418, structure={d = 0x7fff3392e110})
    at /home/cerneelb/Code/amarok/src/context/plasma/package.cpp:82
#3  0x00007fbc0c2a8717 in BackgroundPackage (this=0x7fff3392e140,
path=@0x1260418, ratio=0.817689538)
    at /build/buildd/kdebase-workspace-4.1.96/plasma/wallpapers/image/backgroundpackage.cpp:167
#4  0x00007fbc0c2a112e in Image::setSingleImage (this=0x12603f0)
    at /build/buildd/kdebase-workspace-4.1.96/plasma/wallpapers/image/image.cpp:296
#5  0x00007fbc0c2a2180 in Image::init (this=0x12603f0, config=@0x7fff3392e640)
    at /build/buildd/kdebase-workspace-4.1.96/plasma/wallpapers/image/image.cpp:79
#6  0x00007fbc23a9aaa2 in Plasma::Wallpaper::restore (this=0x12603f0,
config=@0x7fff3392e640)
    at /home/cerneelb/Code/amarok/src/context/plasma/wallpaper.cpp:201
#7  0x00007fbc23a29c9a in Plasma::Applet::paint (this=0x1253210,
painter=0x7fff3392fdc0, option=0x31e59b8,
    widget=0x1260da0) at
/home/cerneelb/Code/amarok/src/context/plasma/applet.cpp:975
#8  0x00007fbc2a465165 in ?? () from /usr/lib/libQtGui.so.4
#9  0x00007fbc2a467cf6 in ?? () from /usr/lib/libQtGui.so.4
#10 0x00007fbc2a468dea in QGraphicsScene::drawItems () from
/usr/lib/libQtGui.so.4
#11 0x00007fbc2a486fdb in QGraphicsView::paintEvent () from
/usr/lib/libQtGui.so.4
#12 0x00007fbc29f84114 in QWidget::event () from /usr/lib/libQtGui.so.4
#13 0x00007fbc2a4819bb in QGraphicsView::viewportEvent () from
/usr/lib/libQtGui.so.4
#14 0x00007fbc2939a038 in
QCoreApplicationPrivate::sendThroughObjectEventFilters () from
/usr/lib/libQtCore.so.4
#15 0x00007fbc29f31c0c in QApplicationPrivate::notify_helper () from
/usr/lib/libQtGui.so.4
#16 0x00007fbc29f399ba in QApplication::notify () from /usr/lib/libQtGui.so.4
#17 0x00007fbc2b31f3cb in KApplication::notify (this=0x7fff33932aa0,
receiver=0x1260da0, event=0x7fff33930510)
    at /build/buildd/kde4libs-4.1.96/kdeui/kernel/kapplication.cpp:307
#18 0x00007fbc2939ad61 in QCoreApplication::notifyInternal () from
/usr/lib/libQtCore.so.4
#19 0x00007fbc29f82b4f in QWidgetPrivate::drawWidget () from
/usr/lib/libQtGui.so.4
#20 0x00007fbc29f83232 in QWidgetPrivate::paintSiblingsRecursive ()
from /usr/lib/libQtGui.so.4
#21 0x00007fbc29f82808 in QWidgetPrivate::drawWidget () from
/usr/lib/libQtGui.so.4
#22 0x00007fbc29f83232 in QWidgetPrivate::paintSiblingsRecursive ()
from /usr/lib/libQtGui.so.4
#23 0x00007fbc29f8315b in QWidgetPrivate::paintSiblingsRecursive ()
from /usr/lib/libQtGui.so.4
#24 0x00007fbc29f82808 in QWidgetPrivate::drawWidget () from
/usr/lib/libQtGui.so.4
#25 0x00007fbc29f83232 in QWidgetPrivate::paintSiblingsRecursive ()
from /usr/lib/libQtGui.so.4
#26 0x00007fbc29f8315b in QWidgetPrivate::paintSiblingsRecursive ()
from /usr/lib/libQtGui.so.4