127916 2014-01-30 09:56:33 -0800 fast/events/page-visibility-iframe-move-test.html asserts under RenderLayer::paintBackgroundForFragments 2020-02-08 13:47:41 -0800 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=207303 MakingBotsRed, Regression P1 Normal --- 1 ap webkit-unassigned abucur barraclough kling koivisto simon.fraser thorton oldest_to_newest 973777 0 ap 2014-01-30 09:56:33 -0800 Bot says that this started in this range <http://trac.webkit.org/log/?verbose=on&rev=163079&stop_rev=163074>, which probably implicates <http://trac.webkit.org/changeset/163079>. Note that this test was crashing about a week ago as well, but that was for an entirely different reason. Sample crash: <http://build.webkit.org/results/Apple%20MountainLion%20Debug%20WK2%20(Tests)/r163080%20(15681)/fast/events/page-visibility-iframe-move-test-crash-log.txt> Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.JavaScriptCore 0x000000010d81b75a WTFCrash + 42 (Assertions.cpp:333) 1 com.apple.WebCore 0x00000001101d647b WebCore::RenderView::paint(WebCore::PaintInfo&, WebCore::LayoutPoint const&) + 91 (RenderView.cpp:479) 2 com.apple.WebCore 0x0000000110032924 WebCore::RenderLayer::paintBackgroundForFragments(WTF::Vector<WebCore::LayerFragment, 1ul, WTF::CrashOnOverflow> const&, WebCore::GraphicsContext*, WebCore::GraphicsContext*, WebCore::LayoutRect const&, bool, WebCore::RenderLayer::LayerPaintingInfo const&, unsigned int, WebCore::RenderObject*) + 708 (RenderLayer.cpp:4302) 3 com.apple.WebCore 0x000000011002fcc3 WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext*, WebCore::RenderLayer::LayerPaintingInfo const&, unsigned int) + 1875 (RenderLayer.cpp:4051) 4 com.apple.WebCore 0x000000011005dcd7 WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, unsigned int) + 551 (RenderLayerBacking.cpp:2203) 5 com.apple.WebCore 0x000000011005e000 WebCore::RenderLayerBacking::paintContents(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, unsigned int, WebCore::IntRect const&) + 608 (RenderLayerBacking.cpp:2248) 973784 1 ap 2014-01-30 10:02:51 -0800 Hmm, two iterations in a row crashed, but the third one didn't, so it's possible that another recent change made the test flaky. 974116 2 ap 2014-01-30 17:11:41 -0800 So, it only happened twice, and is green since. Can't blame this revision I guess. 974244 3 abucur 2014-01-31 00:12:50 -0800 Thanks for the heads up! I'm taking a look anyway, maybe I spot something fishy.