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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 - ASSERTION FAILED: m_parsedStyleSheetCache-&gt;isInMemoryCache()"
   href="https://bugs.webkit.org/show_bug.cgi?id=163905">163905</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>ASSERTION FAILED: m_parsedStyleSheetCache-&gt;isInMemoryCache()
          </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>New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>ryanhaddad&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Flaky assertion failure seen with http/tests/misc/acid2.html

ASSERTION FAILED: m_parsedStyleSheetCache-&gt;isInMemoryCache()
/Volumes/Data/slave/elcapitan-debug/build/Source/WebCore/loader/cache/CachedCSSStyleSheet.cpp(167) : PassRefPtr&lt;WebCore::StyleSheetContents&gt; WebCore::CachedCSSStyleSheet::restoreParsedStyleSheet(const WebCore::CSSParserContext &amp;, WebCore::CachePolicy)
1   0x10fe69310 WTFCrash
2   0x1153778fd WebCore::CachedCSSStyleSheet::restoreParsedStyleSheet(WebCore::CSSParserContext const&amp;, WebCore::CachePolicy)
3   0x115e261f5 WebCore::HTMLLinkElement::setCSSStyleSheet(WTF::String const&amp;, WebCore::URL const&amp;, WTF::String const&amp;, WebCore::CachedCSSStyleSheet const*)
4   0x115e265c7 non-virtual thunk to WebCore::HTMLLinkElement::setCSSStyleSheet(WTF::String const&amp;, WebCore::URL const&amp;, WTF::String const&amp;, WebCore::CachedCSSStyleSheet const*)
5   0x1153770ea WebCore::CachedCSSStyleSheet::didAddClient(WebCore::CachedResourceClient&amp;)
6   0x11538e430 WebCore::CachedResource::addClient(WebCore::CachedResourceClient&amp;)
7   0x115e25541 WebCore::HTMLLinkElement::process()
8   0x115e25e2c WebCore::HTMLLinkElement::insertedInto(WebCore::ContainerNode&amp;)
9   0x1154af9c8 WebCore::notifyNodeInsertedIntoDocument(WebCore::ContainerNode&amp;, WebCore::Node&amp;, WTF::Vector&lt;WTF::Ref&lt;WebCore::Node&gt;, 11ul, WTF::CrashOnOverflow, 16ul&gt;&amp;)
10  0x1154afdf0 WebCore::notifyChildNodeInserted(WebCore::ContainerNode&amp;, WebCore::Node&amp;, WTF::Vector&lt;WTF::Ref&lt;WebCore::Node&gt;, 11ul, WTF::CrashOnOverflow, 16ul&gt;&amp;)
11  0x1154a09a6 WebCore::ContainerNode::notifyChildInserted(WebCore::Node&amp;, WebCore::ContainerNode::ChildChangeSource)
12  0x11549fa2c WebCore::ContainerNode::parserAppendChild(WebCore::Node&amp;)
13  0x115d94a63 WebCore::insert(WebCore::HTMLConstructionSiteTask&amp;)
14  0x115d946ee WebCore::executeInsertTask(WebCore::HTMLConstructionSiteTask&amp;)
15  0x115d90ed2 WebCore::executeTask(WebCore::HTMLConstructionSiteTask&amp;)
16  0x115d90e66 WebCore::HTMLConstructionSite::executeQueuedTasks()
17  0x115ee4f0e WebCore::HTMLTreeBuilder::constructTree(WebCore::AtomicHTMLToken&amp;)
18  0x115dc45e3 WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&amp;)
19  0x115dc44ef WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&amp;)
20  0x115dc31ed WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode)
21  0x115dc2dee WebCore::HTMLDocumentParser::pumpTokenizerIfPossible(WebCore::HTMLDocumentParser::SynchronousMode)
22  0x115dc4fd3 WebCore::HTMLDocumentParser::append(WTF::RefPtr&lt;WTF::StringImpl&gt;&amp;&amp;)
23  0x1157ff2f5 WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter&amp;, char const*, unsigned long)
24  0x115941e93 WebCore::DocumentWriter::addData(char const*, unsigned long)
25  0x1158fd01e WebCore::DocumentLoader::commitData(char const*, unsigned long)
26  0x11ec903fd -[WebFrame(WebInternal) _commitData:]
27  0x11ecce610 -[WebHTMLRepresentation receivedData:withDataSource:]
28  0x11ec6cbea -[WebDataSource(WebInternal) _receivedData:]
29  0x11eca09d7 WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int)
30  0x1158ffb30 WebCore::DocumentLoader::commitLoad(char const*, int)
31  0x1158ffa56 WebCore::DocumentLoader::dataReceived(char const*, int)</pre>
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