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    <head>
      <base href="https://bugs.webkit.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - WebCore crash on RenderTreeBuilder when play video within webview"
   href="https://bugs.webkit.org/show_bug.cgi?id=197877">197877</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>WebCore crash on RenderTreeBuilder when play video within webview
          </td>
        </tr>

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

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

        <tr>
          <th>Hardware</th>
          <td>iPhone / iPad
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>iOS 12
          </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>Canvas
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>lidjxy@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dino@apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>WebCore 
WTFCrashWithInfo(int, char const*, char const*, int) + 20
1
WebCore 
WebCore::RenderTreeBuilder::RenderTreeBuilder(WebCore::RenderView&) + 358
2       WebCore 
WebCore::RenderTreeUpdater::tearDownRenderers(WebCore::Element&) + 44
3       WebCore 
WebCore::ContainerNode::removeBetween(WebCore::Node*, WebCore::Node*, WebCore::Node&) + 140
4       WebCore 
WebCore::ContainerNode::removeChild(WebCore::Node&) + 644
5       WebCore 
WebCore::VTTCue::removeDisplayTree() + 136
6       WebCore 
WebCore::HTMLMediaElement::updateActiveTextTrackCues(WTF::MediaTime const&) + 5828
7       WebCore 
WTF::Function<void ()>::CallableWrapper<WebCore::HTMLMediaElement::updateActiveTextTrackCues(WTF::MediaTime const&)::$_22>::call() + 172
8       AVFoundation    
__67-[AVOccasionalTimebaseObserver initWithTimebase:times:queue:block:]_block_invoke_4 + 68


the stack of function calls, the iOS system is iOS 12.2, and the webkit version is 607.1.40 i think.</pre>
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      </p>


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