[Webkit-unassigned] [Bug 102724] New: [chromium] Layout tests svg/carto.net/colourpicker.svg and svg/custom/gradient-stop-corner-cases.svg are failing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102724

           Summary: [chromium] Layout tests svg/carto.net/colourpicker.svg
                    and svg/custom/gradient-stop-corner-cases.svg are
                    failing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jianli at chromium.org


The following layout tests are causing assertion on Mac Dbg and Linux Dbg

svg/carto.net/colourpicker.svg
svg/custom/gradient-stop-corner-cases.svg

The stack is:

STDERR: [28099:28099:1031633578430:FATAL:SkBlitRow_opts_SSE2.cpp(115)] third_party/skia/src/opts/SkBlitRow_opts_SSE2.cpp:115: failed assertion "alpha == 255"
STDERR: 
STDERR:     base::debug::StackTrace::StackTrace() [0x7f62f08e29f6]
STDERR:     logging::LogMessage::~LogMessage() [0x7f62f0917837]
STDERR:     SkDebugf_FileLine() [0x7f62ef737dd7]
STDERR:     S32A_Opaque_BlitRow32_SSE2() [0x7f62ef901c95]
STDERR:     SkARGB32_Shader_Blitter::blitV() [0x7f62ef77d470]
STDERR:     do_scanline() [0x7f62ef801dca]
STDERR:     antifilldot8() [0x7f62ef801f0f]
STDERR:     antifillrect() [0x7f62ef8020f6]
STDERR:     antifillrect() [0x7f62ef80240d]
STDERR:     SkScan::AntiFillRect() [0x7f62ef8024aa]
STDERR:     SkScan::AntiFillRect() [0x7f62ef8025af]
STDERR:     SkDraw::drawRect() [0x7f62ef7a0f07]
STDERR:     SkDevice::drawRect() [0x7f62ef79e151]
STDERR:     SkCanvas::drawRect() [0x7f62ef7873b6]
STDERR:     WebCore::GraphicsContext::fillRect() [0x7f62f3c6a6ab]
STDERR:     WebCore::RenderSVGRect::fillShape() [0x7f62f47a7dad]
STDERR:     WebCore::RenderSVGResourceGradient::postApplyResource() [0x7f62f47b4e18]
STDERR:     WebCore::RenderSVGShape::fillShape() [0x7f62f47c7355]
STDERR:     WebCore::RenderSVGShape::fillAndStrokeShape() [0x7f62f47c7592]
STDERR:     WebCore::RenderSVGShape::paint() [0x7f62f47c7910]
STDERR:     WebCore::RenderSVGContainer::paint() [0x7f62f479df24]
STDERR:     WebCore::RenderBox::paint() [0x7f62f45e0f12]
STDERR:     WebCore::RenderSVGRoot::paintReplaced() [0x7f62f47c33d1]
STDERR:     WebCore::RenderReplaced::paint() [0x7f62f46eddca]
STDERR:     WebCore::RenderLayer::paintLayerContents() [0x7f62f466edcd]
STDERR:     WebCore::RenderLayer::paintLayerContentsAndReflection() [0x7f62f466de2e]
STDERR:     WebCore::RenderLayer::paintLayer() [0x7f62f466dcf8]
STDERR:     WebCore::RenderLayer::paintList() [0x7f62f466f4bb]
STDERR:     WebCore::RenderLayer::paintLayerContents() [0x7f62f466f013]
STDERR:     WebCore::RenderLayer::paintLayerContentsAndReflection() [0x7f62f466de2e]
STDERR:     WebCore::RenderLayer::paintLayer() [0x7f62f466dcf8]
STDERR:     WebCore::RenderLayer::paint() [0x7f62f466ce42]
STDERR:     WebCore::FrameView::paintContents() [0x7f62f4439f93]
STDERR:     WebCore::ScrollView::paint() [0x7f62f3b3f872]
STDERR:     WebKit::PageWidgetDelegate::paint() [0x7f62f2dd6a25]
STDERR:     WebKit::WebViewImpl::paint() [0x7f62f2e80fd3]
STDERR:     WebViewHost::paintRect() [0x4aee00]
STDERR:     WebViewHost::paintInvalidatedRegion() [0x4af03c]
STDERR:     TestShell::dump() [0x49ae7f]
STDERR:     TestShell::testFinished() [0x49977e]
STDERR:     DRTTestRunner::WorkQueue::processWorkSoon() [0x4745cc]
STDERR:     DRTTestRunner::locationChangeDone() [0x47583d]
STDERR:     WebViewHost::locationChangeDone() [0x4ae322]
STDERR:     WebViewHost::didFinishLoad() [0x4aacd4]
STDERR:     WebKit::FrameLoaderClientImpl::dispatchDidFinishLoad() [0x7f62f2db5c2b]
STDERR:     WebCore::FrameLoader::checkLoadCompleteForThisFrame() [0x7f62f4359bd2]
STDERR:     WebCore::FrameLoader::checkLoadComplete() [0x7f62f435a78e]
STDERR:     WebCore::DocumentLoader::finishedLoading() [0x7f62f4332bee]
STDERR:     WebCore::MainResourceLoader::didFinishLoading() [0x7f62f43700ef]
STDERR:     WebCore::ResourceLoader::didFinishLoading() [0x7f62f43858e9]
STDERR:     WebCore::ResourceHandleInternal::didFinishLoading() [0x7f62f3cc47ae]
STDERR:     webkit_glue::WebURLLoaderImpl::Context::OnCompletedRequest() [0x7f62ef1f4fe5]
STDERR:     (anonymous namespace)::RequestProxy::NotifyCompletedRequest() [0x5ed1ef]
STDERR:     base::internal::RunnableAdapter<>::Run() [0x5f36b5]
STDERR:     base::internal::InvokeHelper<>::MakeItSo() [0x5f3060]
STDERR:     base::internal::Invoker<>::Run() [0x5f2972]
STDERR:     base::Callback<>::Run() [0x7f62f08da3bd]
STDERR:     MessageLoop::RunTask() [0x7f62f091dad1]
STDERR:     MessageLoop::DeferOrRunPendingTask() [0x7f62f091dbec]
STDERR:     MessageLoop::DoWork() [0x7f62f091e481]
STDERR:     base::MessagePumpGlib::HandleDispatch() [0x7f62f08bf2c9]
STDERR:     (anonymous namespace)::WorkSourceDispatch() [0x7f62f08be9db]


Probable cause:

Not sure who is the culprit. But based on flakiness dashboard, the 1st regression occurred between the following range:
http://trac.webkit.org/log/?verbose=on&rev=135165&stop_rev=135163

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