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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 - RenderImages with dirty layout after layout on 4chan.org"
   href="https://bugs.webkit.org/show_bug.cgi?id=166573">166573</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>RenderImages with dirty layout after layout on 4chan.org
          </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>Images
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>akling&#64;apple.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>zalan&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>To reproduce:

Open any thread on <a href="http://boards.4chan.org/wg/catalog">http://boards.4chan.org/wg/catalog</a>
For example: <a href="http://boards.4chan.org/wg/thread/6803455">http://boards.4chan.org/wg/thread/6803455</a>

SHOULD NEVER BE REACHED
/Volumes/Gala/Users/kling/Source/Safari/OpenSource/Source/WebCore/page/FrameView.cpp(218) : auto WebCore::RenderTreeNeedsLayoutChecker::~RenderTreeNeedsLayoutChecker()::(anonymous class)::operator()(const WebCore::RenderObject &amp;) const
1   0x10bff565d WTFCrash
2   0x10f368163 WebCore::RenderTreeNeedsLayoutChecker::~RenderTreeNeedsLayoutChecker()::'lambda'(WebCore::RenderObject const&amp;)::operator()(WebCore::RenderObject const&amp;) const
3   0x10f3680d2 WebCore::RenderTreeNeedsLayoutChecker::~RenderTreeNeedsLayoutChecker()
4   0x10f354fb5 WebCore::RenderTreeNeedsLayoutChecker::~RenderTreeNeedsLayoutChecker()
5   0x10f35342d WebCore::FrameView::layout(bool)
6   0x10f363fd9 WebCore::FrameView::updateLayoutAndStyleIfNeededRecursive()
7   0x108238c15 WebKit::WebPage::layoutIfNeeded()
8   0x107fbfdcc WebKit::TiledCoreAnimationDrawingArea::flushLayers()
9   0x107fc0529 non-virtual thunk to WebKit::TiledCoreAnimationDrawingArea::flushLayers()
10  0x1103db865 WebCore::LayerFlushScheduler::layerFlushCallback()
11  0x1103dcadb WebCore::LayerFlushScheduler::LayerFlushScheduler(WebCore::LayerFlushSchedulerClient*)::$_0::operator()() const
12  0x1103dca8d _ZNSt3__128__invoke_void_return_wrapperIvE6__callIJRZN7WebCore19LayerFlushSchedulerC1EPNS3_25LayerFlushSchedulerClientEE3$_0EEEvDpOT_
13  0x1103dca39 std::__1::__function::__func&lt;WebCore::LayerFlushScheduler::LayerFlushScheduler(WebCore::LayerFlushSchedulerClient*)::$_0, std::__1::allocator&lt;WebCore::LayerFlushScheduler::LayerFlushScheduler(WebCore::LayerFlushSchedulerClient*)::$_0&gt;, void ()&gt;::operator()()
14  0x10e8afc3a std::__1::function&lt;void ()&gt;::operator()() const
15  0x110c4385a WebCore::RunLoopObserver::runLoopObserverFired()
16  0x110c437e0 WebCore::RunLoopObserver::runLoopObserverFired(__CFRunLoopObserver*, unsigned long, void*)
17  0x7fff8ff742d7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__
18  0x7fff8ff74247 __CFRunLoopDoObservers
19  0x7fff8ff54b76 CFRunLoopRunSpecific
20  0x7fff8f4dfacc RunCurrentEventLoopInMode
21  0x7fff8f4df901 ReceiveNextEventCommon
22  0x7fff8f4df736 _BlockUntilNextEventMatchingListInModeWithFilter
23  0x7fff8da85abc _DPSNextEvent
24  0x7fff8e2001f7 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]
25  0x7fff8da7a43d -[NSApplication run]
26  0x7fff8da44d58 NSApplicationMain
27  0x7fffa57b18c7 _xpc_objc_main
28  0x7fffa57b02e4 xpc_main
29  0x106d2418d main
30  0x7fffa554d255 start
31  0x1

ERROR: post-layout: dirty renderer(s)
/Volumes/Gala/Users/kling/Source/Safari/OpenSource/Source/WebCore/page/FrameView.cpp(216) : auto WebCore::RenderTreeNeedsLayoutChecker::~RenderTreeNeedsLayoutChecker()::(anonymous class)::operator()(const WebCore::RenderObject &amp;) const

Render tree is too big for a bugzilla comment, but this guy is the culprit:

BA----L- -+*           IMG RenderImage  (1164.50, 193.31) (0.00, 0.00) renderer-&gt;(0x12694e330) node-&gt;(0x123290420) layout-&gt;[normal child]</pre>
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          <li>You are the assignee for the bug.</li>
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