<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">  
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();
    </script>
    <text y="20">This should not crash, but display an error document.</text>
    <g id="crash">
        <pattern xlink:href="#crash"></pattern>
    </g>
    <use xlink:href="#crash">
</svg>