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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 - Crash in JSC::SlotVisitor::setMarkedAndAppendToMarkStack when using Web Inspector on github.com"
   href="https://bugs.webkit.org/show_bug.cgi?id=156586">156586</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Crash in JSC::SlotVisitor::setMarkedAndAppendToMarkStack when using Web Inspector on github.com
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>Safari Technology Preview
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>OS X 10.11
          </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>aroben&#64;webkit.org
          </td>
        </tr></table>
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        <pre>Created <span class=""><a href="attachment.cgi?id=276409" name="attach_276409" title="crash log">attachment 276409</a> <a href="attachment.cgi?id=276409&amp;action=edit" title="crash log">[details]</a></span>
crash log

To reproduce:

1. Launch Safari Technology Preview (I'm using Version 9.1.1 (11601.6.15, 11602.1.27))
2. Go to <a href="https://github.com">https://github.com</a>
3. Open the Web Inspector
4. Start record a timeline
5. Reload the page
6. Stop recording the timeline

Somewhere in there the web process will crash. Sometimes it's immediately upon opening the Inspector, other times it's when clicking Record, or when finishing the recording. The stack trace always looks basically the same. See attached crash log.</pre>
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