<!DOCTYPE html>
<script>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.waitUntilDone();
  window.onload = function() {
    testRunner.layoutAndPaintAsyncThen(function() { testRunner.notifyDone(); });
  };
}
</script>
<p>PASS if no crash (stack overflow).</p>
<svg width="100" height="100">
  <rect width="100" height="100" fill="url(#p1)"/>
  <pattern id="p3" width="1" height="1">
    <rect fill="url(#p1)" width="100" height="100"/>
  </pattern>
  <pattern id="p2" width="1" height="1">
    <rect fill="url(#p3)" width="100" height="100"/>
  </pattern>
  <pattern id="p1" width="1" height="1">
    <rect fill="url(#p2)" width="100" height="100"/>
  </pattern>
</svg>