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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 - [ iOS ] compositing/video/poster.html is a flaky timeout"
   href="https://bugs.webkit.org/show_bug.cgi?id=228616">228616</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[ iOS ] compositing/video/poster.html is a flaky timeout
          </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>iPhone / iPad
          </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>New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>ayumi_kojima@apple.com
          </td>
        </tr></table>
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        <pre>compositing/video/poster.html

Is a flaky timeout on iOS 14 E Simulator wk2.

History: <a href="https://results.webkit.org/?suite=layout-tests&test=compositing%2Fvideo%2Fposter.html&platform=ios">https://results.webkit.org/?suite=layout-tests&test=compositing%2Fvideo%2Fposter.html&platform=ios</a>

No diff. 

stderr: Wait on notifyDone timed out, process WebKitTestRunnerApp pid = 45609

There are also crashes seen on debug. Crash log is very similar to one that's recently fixed here <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - REGRESSION: [iOS] ASSERTION FAILED: !m_messageReceiverMapCount under WebKit::RemoteAudioHardwareListener::~RemoteAudioHardwareListener()"
   href="show_bug.cgi?id=228038">https://bugs.webkit.org/show_bug.cgi?id=228038</a>. Not sure if this crash is the same cause, but I will mark expectations only for timeout since there are no recent crashes. 

I was able to reproduce the timeout both on debug and release on iOS 15 simulator on my local machine using: 

run-webkit-tests --debug --ios-simulator --iterations 500 --exit-after-n-failures 2 --exit-after-n-crashes-or-timeouts 2 compositing/video/poster.html</pre>
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