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      <base href="https://bugs.webkit.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - JSON.stringify hanging WebKit on a cyclic structure"
   href="https://bugs.webkit.org/show_bug.cgi?id=143511">143511</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>JSON.stringify hanging WebKit on a cyclic structure
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>528+ (Nightly build)
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Macintosh Intel
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Mac OS X 10.10
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Major
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>JavaScriptCore
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>chrisjshull&#64;gmail.com
          </td>
        </tr></table>
      <p>
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        <pre>The following line of code will hang WebKit. 
Don't even get a &quot;Maximum call stack size exceeded&quot; error.

JSON.stringify({ toJSON: function () { return { foo: this }; } });

Reproduces in Safari Version 8.0.5 (10600.5.9), as well as nightly build r182472.

Expected: a &quot;TypeError: JSON.stringify cannot serialize cyclic structures.&quot; should be thrown.</pre>
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      </p>
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