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    <head>
      <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 - Crash in com.apple.JavaScriptCore: WTF::ThreadSpecific&lt;WTF::WTFThreadData, + 142"
   href="https://bugs.webkit.org/show_bug.cgi?id=164898">164898</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Crash in com.apple.JavaScriptCore: WTF::ThreadSpecific&lt;WTF::WTFThreadData, + 142
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>Other
          </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>JavaScriptCore
          </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>Encountered with LayoutTest inspector/debugger/stepping/stepping-try-catch-finally.html

<a href="https://build.webkit.org/results/Apple%20Sierra%20Release%20WK2%20(Tests)/r208861%20(1521)/results.html">https://build.webkit.org/results/Apple%20Sierra%20Release%20WK2%20(Tests)/r208861%20(1521)/results.html</a>

<a href="https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&amp;tests=inspector%2Fdebugger%2Fstepping%2Fstepping-try-catch-finally.html">https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&amp;tests=inspector%2Fdebugger%2Fstepping%2Fstepping-try-catch-finally.html</a>

Thread 12 Crashed:: WTF::AutomaticThread
0   com.apple.JavaScriptCore          0x00000001082d7ffe WTF::ThreadSpecific&lt;WTF::WTFThreadData, (WTF::CanBeGCThread)0&gt;::operator WTF::WTFThreadData*() + 142 (ThreadSpecific.h:150)
1   com.apple.JavaScriptCore          0x0000000108b2a631 WTF::AtomicStringImpl::remove(WTF::AtomicStringImpl*) + 97 (WTFThreadData.h:64)
2   com.apple.JavaScriptCore          0x0000000108b4fe93 WTF::StringImpl::~StringImpl() + 35 (StringImpl.h:486)
3   com.apple.JavaScriptCore          0x0000000108b4fefe WTF::StringImpl::destroy(WTF::StringImpl*) + 14 (StringImpl.cpp:138)
4   com.apple.JavaScriptCore          0x000000010825f945 JSC::TemplateRegistryKey::~TemplateRegistryKey() + 181 (Vector.h:59)
5   com.apple.JavaScriptCore          0x0000000108a533e0 void WTF::HashTable&lt;JSC::TemplateRegistryKey, WTF::KeyValuePair&lt;JSC::TemplateRegistryKey, JSC::Weak&lt;JSC::JSArray&gt; &gt;, WTF::KeyValuePairKeyExtractor&lt;WTF::KeyValuePair&lt;JSC::TemplateRegistryKey, JSC::Weak&lt;JSC::JSArray&gt; &gt; &gt;, JSC::TemplateRegistryKey::Hasher, WTF::HashMap&lt;JSC::TemplateRegistryKey, JSC::Weak&lt;JSC::JSArray&gt;, JSC::TemplateRegistryKey::Hasher, WTF::HashTraits&lt;JSC::TemplateRegistryKey&gt;, WTF::HashTraits&lt;JSC::Weak&lt;JSC::JSArray&gt; &gt; &gt;::KeyValuePairTraits, WTF::HashTraits&lt;JSC::TemplateRegistryKey&gt; &gt;::removeIf&lt;JSC::WeakGCMap&lt;JSC::TemplateRegistryKey, JSC::JSArray, JSC::TemplateRegistryKey::Hasher, WTF::HashTraits&lt;JSC::TemplateRegistryKey&gt; &gt;::pruneStaleEntries()::'lambda'(WTF::KeyValuePair&lt;JSC::TemplateRegistryKey, JSC::Weak&lt;JSC::JSArray&gt; &gt;&amp;)&gt;(JSC::WeakGCMap&lt;JSC::TemplateRegistryKey, JSC::JSArray, JSC::TemplateRegistryKey::
6   com.apple.JavaScriptCore          0x0000000108a53335 std::__1::__function::__func&lt;JSC::WeakGCMap&lt;JSC::TemplateRegistryKey, JSC::JSArray, JSC::TemplateRegistryKey::Hasher, WTF::HashTraits&lt;JSC::TemplateRegistryKey&gt; &gt;::WeakGCMap(JSC::VM&amp;)::'lambda'(), std::__1::allocator&lt;JSC::WeakGCMap&lt;JSC::TemplateRegistryKey, JSC::JSArray, JSC::TemplateRegistryKey::Hasher, WTF::HashTraits&lt;JSC::TemplateRegistryKey&gt; &gt;::WeakGCMap(JSC::VM&amp;)::'lambda'()&gt;, void ()&gt;::operator()() + 21 (functional:1437)
7   com.apple.JavaScriptCore          0x0000000108626291 JSC::Heap::collectInThread() + 593 (HashTable.h:181)
8   com.apple.JavaScriptCore          0x000000010862852d JSC::Heap::Thread::work() + 13 (Heap.cpp:257)
9   com.apple.JavaScriptCore          0x0000000108b5d19f std::__1::__function::__func&lt;WTF::AutomaticThread::start(WTF::Locker&lt;WTF::LockBase&gt; const&amp;)::$_0, std::__1::allocator&lt;WTF::AutomaticThread::start(WTF::Locker&lt;WTF::LockBase&gt; const&amp;)::$_0&gt;, void ()&gt;::operator()() + 415 (AutomaticThread.cpp:195)
10  com.apple.JavaScriptCore          0x0000000108b629c2 WTF::threadEntryPoint(void*) + 178 (functional:1766)
11  com.apple.JavaScriptCore          0x0000000108b62d9f WTF::wtfThreadEntryPoint(void*) + 15 (memory:2723)
12  libsystem_pthread.dylib           0x00007fffc327aabb _pthread_body + 180
13  libsystem_pthread.dylib           0x00007fffc327aa07 _pthread_start + 286
14  libsystem_pthread.dylib           0x00007fffc327a231 thread_start + 13</pre>
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