gecko-dev/layout/xul/crashtests/382746-1.xul

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

<grid>
  <rows>
    <column>
      <hbox/>
      <hbox/>
    </column>
    <hbox/>
  </rows>
</grid>

</window>