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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 - REGRESSION (r205658): Crash in JSC::MarkedBlock::vm() const + 12"
   href="https://bugs.webkit.org/show_bug.cgi?id=161797">161797</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>REGRESSION (r205658): Crash in JSC::MarkedBlock::vm() const + 12
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>Normal
          </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>ryanhaddad&#64;apple.com
          </td>
        </tr></table>
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        <pre>Crash in JSC::MarkedBlock::vm() const + 12

Seen with imported/w3c/canvas/2d.fillRect.clip.html
<a href="https://build.webkit.org/results/Apple%20Yosemite%20Debug%20WK2%20(Tests)/r205740%20(14897)/results.html">https://build.webkit.org/results/Apple%20Yosemite%20Debug%20WK2%20(Tests)/r205740%20(14897)/results.html</a>

fast/layers/zindex-inherit.html
<a href="https://build.webkit.org/results/Apple%20El%20Capitan%20Debug%20WK1%20(Tests)/r205729%20(8250)/results.html">https://build.webkit.org/results/Apple%20El%20Capitan%20Debug%20WK1%20(Tests)/r205729%20(8250)/results.html</a></pre>
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