LayoutTests/svg/custom/reference-cycle.svg

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <defs>
    <filter>
      <feImage id="self" xlink:href="#self"/>
    </filter>

    <filter>
      <feImage id="indirect_1" xlink:href="#indirect_2"/>
      <feImage id="indirect_2" xlink:href="#indirect_1"/>
    </filter>
  </defs>

  <text y="100">PASS: did not crash.</text>

  <script>
    if (window.testRunner)
      testRunner.dumpAsText();
  </script>
</svg>