[Webkit-unassigned] [Bug 136918] [iOS8 and Webkit Nightly][CSS Regions] Assertion failure and null dereference crash when using animations and regions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=136918





--- Comment #1 from Mihnea Ovidenie <mihnea at adobe.com>  2014-09-18 06:52:52 PST ---
The fix for https://bugs.webkit.org/show_bug.cgi?id=129371 remove the check for m_layerToRegionMap causing the reported crash with the stack trace:

ASSERTION FAILED: m_layerToRegionMap
/Users/mihnea/WebKit/Source/WebCore/rendering/RenderFlowThread.cpp(254) : WebCore::RenderNamedFlowFragment *WebCore::RenderFlowThread::cachedRegionForCompositedLayer(WebCore::RenderLayer &) const
1   0x10ffacc50 WTFCrash
2   0x112a6148b WebCore::RenderFlowThread::cachedRegionForCompositedLayer(WebCore::RenderLayer&) const
3   0x112af8fe3 WebCore::RenderLayerBacking::adjustAncestorCompositingBoundsForFlowThread(WebCore::LayoutRect&, WebCore::RenderLayer const*) const
4   0x112af433f WebCore::RenderLayerBacking::updateGeometry()
5   0x112adc1b1 WebCore::RenderLayer::styleChanged(WebCore::StyleDifference, WebCore::RenderStyle const*)
6   0x112b26264 WebCore::RenderLayerModelObject::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)
7   0x1129e8986 WebCore::RenderBox::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)
8   0x112b9250d WebCore::RenderReplaced::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)
9   0x112aa4e0d WebCore::RenderImage::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)
10  0x112a41da1 WebCore::RenderElement::setStyle(WTF::PassRef<WebCore::RenderStyle>)
11  0x112f37b3e WebCore::RenderElement::setAnimatableStyle(WTF::PassRef<WebCore::RenderStyle>)
12  0x112f349ef WebCore::Style::resolveLocal(WebCore::Element&, WebCore::RenderStyle&, WebCore::Style::RenderTreePosition&, WebCore::Style::Change)
13  0x112f32250 WebCore::Style::resolveTree(WebCore::Element&, WebCore::RenderStyle&, WebCore::Style::RenderTreePosition&, WebCore::Style::Change)
14  0x112f324ae WebCore::Style::resolveTree(WebCore::Element&, WebCore::RenderStyle&, WebCore::Style::RenderTreePosition&, WebCore::Style::Change)
15  0x112f324ae WebCore::Style::resolveTree(WebCore::Element&, WebCore::RenderStyle&, WebCore::Style::RenderTreePosition&, WebCore::Style::Change)
16  0x112f32108 WebCore::Style::resolveTree(WebCore::Document&, WebCore::Style::Change)
17  0x11189f2b6 WebCore::Document::recalcStyle(WebCore::Style::Change)
18  0x11189b84f WebCore::Document::updateStyleIfNeeded()
19  0x1113c1e04 WebCore::AnimationControllerPrivate::fireEventsAndUpdateStyle()
20  0x1113c1406 WebCore::AnimationControllerPrivate::animationTimerFired(WebCore::Timer<WebCore::AnimationControllerPrivate>&)

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