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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 - Invalid FrameView::m_viewportRenderer after layout is finished."
   href="https://bugs.webkit.org/show_bug.cgi?id=147848">147848</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Invalid FrameView::m_viewportRenderer after layout is finished.
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>528+ (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>Layout and Rendering
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>zalan&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>0   WebCore                           0x000000019680c128 WebCore::FrameView::contentsSizeRespectingOverflow() const + 128 (RenderStyle.h:306)
1   WebCore                           0x000000019680c120 WebCore::FrameView::contentsSizeRespectingOverflow() const + 120 (FrameView.cpp:629)
2   WebKit                            0x000000018acb73e0 WebKit::WebPage::mainFrameDidLayout() + 128 (WebPage.cpp:3522)
3   WebCore                           0x00000001963bf3f0 WebCore::FrameView::performPostLayoutTasks() + 164 (FrameView.cpp:3045)
4   WebCore                           0x00000001963ba964 WebCore::FrameView::layout(bool) + 496 (TemporaryChange.h:55)
5   WebCore                           0x00000001966c32c8 WebCore::Document::updateLayoutIfDimensionsOutOfDate(WebCore::Element&amp;, WebCore::DimensionsCheck) + 1312 (Document.cpp:2036)
6   WebCore                           0x0000000196475a50 WebCore::Element::clientWidth() + 40 (Node.h:395)
7   WebCore                           0x0000000196a7d39c WebCore::jsElementClientWidth(JSC::ExecState*, JSC::JSObject*, long long, JSC::PropertyName) + 48 (JSCJSValueInlines.h:141)
8   JavaScriptCore                    0x000000018608d590 JSC::LLInt::getByVal(JSC::ExecState*, JSC::JSValue, JSC::JSValue) + 3284 (PropertySlot.h:257)
9   JavaScriptCore                    0x000000018606c110 llint_slow_path_get_by_val + 180 (LLIntSlowPaths.cpp:749)
10  JavaScriptCore                    0x00000001864b331c llint_entry + 12620
11  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
12  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
13  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
14  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
15  ???                               0x000000014b09cbc0 0 + 5553900480
16  JavaScriptCore                    0x00000001864b5dd0 llint_entry + 23552
17  JavaScriptCore                    0x00000001864b6004 llint_entry + 24116
18  JavaScriptCore                    0x00000001864b5dd0 llint_entry + 23552
19  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
20  JavaScriptCore                    0x00000001864b6004 llint_entry + 24116
21  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
22  JavaScriptCore                    0x00000001864b6004 llint_entry + 24116
23  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
24  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
25  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
26  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
27  JavaScriptCore                    0x00000001864b5e34 llint_entry + 23652
28  JavaScriptCore                    0x00000001864affb8 vmEntryToJavaScript + 312
29  JavaScriptCore                    0x00000001863dcd04 JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 180 (VM.h:384)
30  JavaScriptCore                    0x000000018605e39c JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*) + 8204 (Interpreter.cpp:901)
31  JavaScriptCore                    0x00000001861b65e8 JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&amp;, JSC::JSValue, WTF::NakedPtr&lt;JSC::Exception&gt;&amp;) + 440 (Completion.cpp:82)
32  WebCore                           0x0000000196f1ad28 WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&amp;, WebCore::DOMWrapperWorld&amp;) + 292 (JSMainThreadExecState.h:62)
33  WebCore                           0x000000019636aa54 WebCore::ScriptElement::executeScript(WebCore::ScriptSourceCode const&amp;) + 340 (ScriptElement.cpp:309)
34  WebCore                           0x00000001964a89bc WebCore::ScriptElement::execute(WebCore::CachedScript*) + 188 (StdLibExtras.h:374)
35  WebCore                           0x0000000196f2134c WebCore::ScriptRunner::timerFired() + 468 (ScriptRunner.cpp:122)
36  WebCore                           0x0000000196342ca8 WebCore::ThreadTimers::sharedTimerFiredInternal() + 148 (ThreadTimers.cpp:135)
37  WebCore                           0x0000000196342be8 WebCore::timerFired(__CFRunLoopTimer*, void*) + 36 (SharedTimerCF.cpp:82)
38  CoreFoundation                    0x00000001849c97d4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28 (CFRunLoop.c:1630)
39  CoreFoundation                    0x00000001849c9478 __CFRunLoopDoTimer + 884 (CFRunLoop.c:2168)
40  CoreFoundation                    0x00000001849c6b8c __CFRunLoopRun + 1520 (CFRunLoop.c:2306)
41  CoreFoundation                    0x00000001848f58a0 CFRunLoopRunSpecific + 384 (CFRunLoop.c:2814)
42  Foundation                        0x000000018586894c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 308 (NSRunLoop.m:367)
43  Foundation                        0x00000001858bdf74 -[NSRunLoop(NSRunLoop) run] + 88 (NSRunLoop.m:388)
44  libxpc.dylib                      0x0000000199eccd4c _xpc_objc_main + 660 (main.m:177)
45  libxpc.dylib                      0x0000000199ecea80 xpc_main + 200 (init.c:1395)
46  com.apple.WebKit.WebContent       0x00000001000ab924 main + 56 (XPCServiceMain.mm:89)
47  libdyld.dylib                     0x0000000199caa8b8 start + 4 (start_glue.s:80)</pre>
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