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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_mayBeExecuting"
   href="https://bugs.webkit.org/show_bug.cgi?id=165097">165097</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>ASSERTION FAILED: !m_mayBeExecuting
          </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>Created <span class=""><a href="attachment.cgi?id=295498" name="attach_295498" title="Crash log">attachment 295498</a> <a href="attachment.cgi?id=295498&amp;action=edit" title="Crash log">[details]</a></span>
Crash log

ASSERTION FAILED: !m_mayBeExecuting
/Volumes/Data/slave/elcapitan-debug/build/Source/JavaScriptCore/jit/GCAwareJITStubRoutine.cpp(75) : void JSC::GCAwareJITStubRoutine::deleteFromGC()
1   0x10b371a00 WTFCrash
2   0x10ab25901 JSC::GCAwareJITStubRoutine::deleteFromGC()
3   0x10acdd76d JSC::JITStubRoutineSet::deleteUnmarkedJettisonedStubRoutines()
4   0x10ab37e9a JSC::Heap::deleteUnmarkedCompiledCode()
5   0x10ab3a98d JSC::Heap::finalize()
6   0x10ab3a4d8 JSC::Heap::handleNeedFinalize(unsigned int)
7   0x10ab3a2ff JSC::Heap::stopIfNecessarySlow(unsigned int)
8   0x10ab3a276 JSC::Heap::stopIfNecessarySlow()
9   0x10ab3fdde JSC::Heap::stopIfNecessary()
10  0x10ab343bb JSC::Heap::collectIfNecessaryOrDefer(JSC::GCDeferralContext*)
11  0x10ab3b8af JSC::Heap::decrementDeferralDepthAndGCIfNeeded()
12  0x10a2b79a8 JSC::DeferGC::~DeferGC()
13  0x10a2b5185 JSC::DeferGC::~DeferGC()
14  0x10b16ed39 JSC::Structure::materializePropertyTable(JSC::VM&amp;, bool)
15  0x10b16f77e JSC::Structure::takePropertyTableOrCloneIfPinned(JSC::VM&amp;)
16  0x10b16f4d9 JSC::Structure::addNewPropertyTransition(JSC::VM&amp;, JSC::Structure*, JSC::PropertyName, unsigned int, int&amp;, JSC::PutPropertySlot::Context, JSC::DeferredStructureTransitionWatchpointFire*)
17  0x10a2cb652 bool JSC::JSObject::putDirectInternal&lt;(JSC::JSObject::PutMode)1&gt;(JSC::VM&amp;, JSC::PropertyName, JSC::JSValue, unsigned int, JSC::PutPropertySlot&amp;)
18  0x10a2c736d JSC::JSObject::putDirect(JSC::VM&amp;, JSC::PropertyName, JSC::JSValue, unsigned int)
19  0x10ad3daa3 JSC::JSFunction::finishCreation(JSC::VM&amp;, JSC::NativeExecutable*, int, WTF::String const&amp;)
20  0x10ad3d933 JSC::JSFunction::create(JSC::VM&amp;, JSC::JSGlobalObject*, int, WTF::String const&amp;, long long (*)(JSC::ExecState*), JSC::Intrinsic, long long (*)(JSC::ExecState*), JSC::DOMJIT::Signature const*)
21  0x10ab1efc6 JSC::FunctionPrototype::addFunctionProperties(JSC::ExecState*, JSC::JSGlobalObject*, JSC::JSFunction**, JSC::JSFunction**, JSC::JSFunction**)
22  0x10ad5c903 JSC::JSGlobalObject::init(JSC::VM&amp;)
23  0x111aa346c JSC::JSGlobalObject::finishCreation(JSC::VM&amp;, JSC::JSObject*)
24  0x111aa2c3a WebCore::JSDOMGlobalObject::finishCreation(JSC::VM&amp;, JSC::JSObject*)
25  0x111bcdd88 WebCore::JSDOMWindowBase::finishCreation(JSC::VM&amp;, WebCore::JSDOMWindowShell*)
26  0x111b10b86 WebCore::JSDOMWindow::finishCreation(JSC::VM&amp;, WebCore::JSDOMWindowShell*)
27  0x111bf158c WebCore::JSDOMWindow::create(JSC::VM&amp;, JSC::Structure*, WTF::Ref&lt;WebCore::DOMWindow&gt;&amp;&amp;, WebCore::JSDOMWindowShell*)
28  0x111bf0f19 WebCore::JSDOMWindowShell::setWindow(WTF::RefPtr&lt;WebCore::DOMWindow&gt;&amp;&amp;)
29  0x112c98432 WebCore::ScriptController::clearWindowShell(WebCore::DOMWindow*, bool)
30  0x1112f59fe WebCore::FrameLoader::clear(WebCore::Document*, bool, bool, bool)
31  0x111014f74 WebCore::DocumentWriter::begin(WebCore::URL const&amp;, bool, WebCore::Document*)

Seen with LayoutTest http/tests/cache/cache-redirections.html
<a href="https://build.webkit.org/results/Apple%20El%20Capitan%20Debug%20WK1%20(Tests)/r208998%20(9936)/results.html">https://build.webkit.org/results/Apple%20El%20Capitan%20Debug%20WK1%20(Tests)/r208998%20(9936)/results.html</a></pre>
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