Comment # 5 on bug 1194147 from Steffen Winterfeldt

That's a bug in gfxboot; it creates a broken installation source URL:

  (wrong) install=hd://dev/sdb/

should be instead:

  install=hd:/dev/sdb/

Or even better:

  install=/?device=/dev/sdb

Independent of this, yast should probably also not crash here.