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      <base href="https://bugs.webkit.org/">
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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 - [ Windows EWS ] html5lib/generated/run-tests19-data.html is a flaky crash"
   href="https://bugs.webkit.org/show_bug.cgi?id=241382">241382</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[ Windows EWS ] html5lib/generated/run-tests19-data.html is a flaky crash
          </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>New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>rackler@apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Description:
html5lib/generated/run-tests19-data.html

Is flaky crash on macOS-AppleSilicon-Big-Sur-Debug-WK2-Tests-EWS in <a href="https://ews-build.s3-us-west-2.amazonaws.com/macOS-AppleSilicon-Big-Sur-Debug-WK2-Tests-EWS/460048-32498/results.html">https://ews-build.s3-us-west-2.amazonaws.com/macOS-AppleSilicon-Big-Sur-Debug-WK2-Tests-EWS/460048-32498/results.html</a>

History:
This does not appear in <a href="https://results.webkit.org/?suite=layout-tests&test=html5lib%2Fgenerated%2Frun-tests19-data.html&platform=ios&platform=mac&limit=50000">https://results.webkit.org/?suite=layout-tests&test=html5lib%2Fgenerated%2Frun-tests19-data.html&platform=ios&platform=mac&limit=50000</a>

The first instance I can find is <a href="https://ews-build.webkit.org/#/builders/60/builds/32363">https://ews-build.webkit.org/#/builders/60/builds/32363</a>

Crash Log:
No crash log found

stderr:
ASSERTION FAILED: !lookupForWriting(Extractor::extract(entry)).second
/Volumes/Data/worker/macOS-AppleSilicon-Big-Sur-Debug-Build-EWS/build/WebKitBuild/Debug/usr/local/include/wtf/HashTable.h(1054) : WTF::HashTable::ValueType *WTF::HashTable<WebCore::TextRun, WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry>>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry>>>, WTF::DefaultHash<WebCore::TextRun>, WTF::HashMap<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry>>::KeyValuePairTraits, WTF::HashTraits<WebCore::TextRun>>::reinsert(WTF::HashTable::ValueType &&) [Key = WebCore::TextRun, Value = WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry>>, Extractor = WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry>>>, HashFunctions = WTF::DefaultHash<WebCore::TextRun>, Traits = WTF::HashMap<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry>>::KeyValuePairTraits, KeyTraits = WTF::HashTraits<WebCore::TextRun>]
1   0x141fc8674 WTFCrash
2   0x11c0c6fe0 WebCore::JSHTMLHeadElement::createPrototype(JSC::VM&, WebCore::JSDOMGlobalObject&)
3   0x120788320 WTF::HashTable<WebCore::TextRun, WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> >, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> > >, WTF::DefaultHash<WebCore::TextRun>, WTF::HashMap<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter>, WTF::DefaultHash<WebCore::TextRun>, WTF::HashTraits<WebCore::TextRun>, WTF::HashTraits<WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> >, WTF::HashTableTraits>::KeyValuePairTraits, WTF::HashTraits<WebCore::TextRun> >::reinsert(WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> >&&)
4   0x120787fac WTF::HashTable<WebCore::TextRun, WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> >, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> > >, WTF::DefaultHash<WebCore::TextRun>, WTF::HashMap<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter>, WTF::DefaultHash<WebCore::TextRun>, WTF::HashTraits<WebCore::TextRun>, WTF::HashTraits<WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> >, WTF::HashTableTraits>::KeyValuePairTraits, WTF::HashTraits<WebCore::TextRun> >::rehash(unsigned int, WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> >*)
5   0x120787918 WTF::HashTable<WebCore::TextRun, WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> >, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> > >, WTF::DefaultHash<WebCore::TextRun>, WTF::HashMap<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter>, WTF::DefaultHash<WebCore::TextRun>, WTF::HashTraits<WebCore::TextRun>, WTF::HashTraits<WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> >, WTF::HashTableTraits>::KeyValuePairTraits, WTF::HashTraits<WebCore::TextRun> >::expand(WTF::KeyValuePair<WebCore::TextRun, WTF::WeakPtr<WebCore::GlyphDisplayListCache::Entry, WTF::EmptyCounter> >*)</pre>
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