[Webkit-unassigned] [Bug 178749] When navigating back to a page, compositing layers may not use accelerated drawing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=178749

--- Comment #4 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Backtrace for creating compositing layers under style change:

  * frame #0: 0x00000007ea56b01a WebCore`WebCore::RenderLayerBacking::createPrimaryGraphicsLayer(this=0x00000007fb9fb630) at RenderLayerBacking.cpp:391
    frame #1: 0x00000007ea56ae54 WebCore`WebCore::RenderLayerBacking::RenderLayerBacking(this=0x00000007fb9fb630, layer=0x00000007fb9975c8) at RenderLayerBacking.cpp:216
    frame #2: 0x00000007ea56b9dd WebCore`WebCore::RenderLayerBacking::RenderLayerBacking(this=0x00000007fb9fb630, layer=0x00000007fb9975c8) at RenderLayerBacking.cpp:210
    frame #3: 0x00000007ea5557db WebCore`WebCore::RenderLayer::ensureBacking() [inlined] std::__1::__unique_if<WebCore::RenderLayerBacking>::__unique_single std::__1::make_unique<WebCore::RenderLayerBacking, WebCore::RenderLayer&>(__args=0x00000007fb9975c8) at memory:3006
    frame #4: 0x00000007ea5557b2 WebCore`WebCore::RenderLayer::ensureBacking(this=0x00000007fb9975c8) at RenderLayer.cpp:5911
    frame #5: 0x00000007ea5936d8 WebCore`WebCore::RenderLayerCompositor::updateBacking(this=0x00000007fb9b1b10, layer=0x00000007fb9975c8, shouldRepaint=CompositingChangeRepaintNow, backingRequired=Yes) at RenderLayerCompositor.cpp:1020
    frame #6: 0x00000007ea592f38 WebCore`WebCore::RenderLayerCompositor::updateLayerCompositingState(this=0x00000007fb9b1b10, layer=0x00000007fb9975c8, shouldRepaint=CompositingChangeRepaintNow) at RenderLayerCompositor.cpp:1109
    frame #7: 0x00000007ea592e42 WebCore`WebCore::RenderLayerCompositor::layerStyleChanged(this=0x00000007fb9b1b10, diff=StyleDifferenceNewStyle, layer=0x00000007fb9975c8, oldStyle=0x0000000000000000) at RenderLayerCompositor.cpp:933
    frame #8: 0x00000007ea55904d WebCore`WebCore::RenderLayer::styleChanged(this=0x00000007fb9975c8, diff=StyleDifferenceNewStyle, oldStyle=0x0000000000000000) at RenderLayer.cpp:6635
    frame #9: 0x00000007ea5aeec6 WebCore`WebCore::RenderLayerModelObject::styleDidChange(this=0x00000007fe4786c0, diff=StyleDifferenceNewStyle, oldStyle=0x0000000000000000) at RenderLayerModelObject.cpp:193
    frame #10: 0x00000007ea45ac22 WebCore`WebCore::RenderBox::styleDidChange(this=0x00000007fe4786c0, diff=StyleDifferenceNewStyle, oldStyle=0x0000000000000000) at RenderBox.cpp:302
    frame #11: 0x00000007ea3d3602 WebCore`WebCore::RenderBlock::styleDidChange(this=0x00000007fe4786c0, diff=StyleDifferenceNewStyle, oldStyle=0x0000000000000000) at RenderBlock.cpp:432
    frame #12: 0x00000007ea4245c3 WebCore`WebCore::RenderBlockFlow::styleDidChange(this=0x00000007fe4786c0, diff=StyleDifferenceNewStyle, oldStyle=0x0000000000000000) at RenderBlockFlow.cpp:2011
    frame #13: 0x00000007ea4bed34 WebCore`WebCore::RenderElement::initializeStyle(this=0x00000007fe4786c0) at RenderElement.cpp:380
    frame #14: 0x00000007ea73ea0c WebCore`WebCore::RenderTreeUpdater::createRenderer(this=0x00007ffee2db2360, element=0x00000007fe44d0d0, style=0x00007ffee2daf5d0) at RenderTreeUpdater.cpp:373
    frame #15: 0x00000007ea73df18 WebCore`WebCore::RenderTreeUpdater::updateElementRenderer(this=0x00007ffee2db2360, element=0x00000007fe44d0d0, update=0x00000007fbbda950) at RenderTreeUpdater.cpp:326
    frame #16: 0x00000007ea73d611 WebCore`WebCore::RenderTreeUpdater::updateRenderTree(this=0x00007ffee2db2360, root=0x00000007fb956000) at RenderTreeUpdater.cpp:198
    frame #17: 0x00000007ea73cf59 WebCore`WebCore::RenderTreeUpdater::commit(this=0x00007ffee2db2360, styleUpdate=unique_ptr<const WebCore::Style::Update, std::__1::default_delete<const WebCore::Style::Update> > @ 0x00007ffee2db2358) at RenderTreeUpdater.cpp:134
    frame #18: 0x00000007e87a7632 WebCore`WebCore::Document::resolveStyle(this=0x00000007fb956000, type=Rebuild) at Document.cpp:1825
    frame #19: 0x00000007e87ab1be WebCore`WebCore::Document::createRenderTree(this=0x00000007fb956000) at Document.cpp:2172
    frame #20: 0x00000007e87ab375 WebCore`WebCore::Document::didBecomeCurrentDocumentInFrame(this=0x00000007fb956000) at Document.cpp:2183

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