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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 - Reference cycle between SVGElement and SVGPathSegWithContext leaks Document"
   href="https://bugs.webkit.org/show_bug.cgi?id=151810">151810</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Reference cycle between SVGElement and SVGPathSegWithContext leaks Document
          </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>SVG
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>sabouhallawa&#64;apple.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>zimmermann&#64;kde.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The issue is that &quot;RefPtr&lt;SVGPathElement&gt; m_element&quot; in SVGPathSegWithContext is causing reference cycle by using RefPtr to the element.

Specifically, SVGPathElement::m_pathSegList is a SVGPathSegList (subclass of a Vector of RefPtr&lt;SVGPathSeg&gt;), so it strongly references the SVGPathSeg. In practice, I think all SVGPathSeg objects are SVGPathSegWithContext (maybe that subclass should be folded into SVGPathSeg?) SVGPathSegWithContext::m_contextElement strongly references the SVGPathElement, and so we have a reference cycle.</pre>
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      </p>
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