[Webkit-unassigned] [Bug 121458] New: Layout Test http/tests/security/canvas-remote-read-remote-image-redirect.html is flaky

Mon Sep 16 15:33:54 PDT 2013

https://bugs.webkit.org/show_bug.cgi?id=121458

           Summary: Layout Test
                    http/tests/security/canvas-remote-read-remote-image-re
                    direct.html is flaky
           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: ap at webkit.org
                CC: mkwst at chromium.org

The following layout test is flaky on all platforms: http/tests/security/canvas-remote-read-remote-image-redirect.html. The diff is:

-CONSOLE MESSAGE: Unable to get image data from canvas because the canvas has been tainted by cross-origin data.
-CONSOLE MESSAGE: Unable to get image data from canvas because the canvas has been tainted by cross-origin data.
-CONSOLE MESSAGE: Unable to get image data from canvas because the canvas has been tainted by cross-origin data.
-CONSOLE MESSAGE: Unable to get image data from canvas because the canvas has been tainted by cross-origin data.
+CONSOLE MESSAGE: line 108: Unable to get image data from canvas because the canvas has been tainted by cross-origin data.
+CONSOLE MESSAGE: line 108: Unable to get image data from canvas because the canvas has been tainted by cross-origin data.
+CONSOLE MESSAGE: line 108: Unable to get image data from canvas because the canvas has been tainted by cross-origin data.
+CONSOLE MESSAGE: line 108: Unable to get image data from canvas because the canvas has been tainted by cross-origin data.

Line 108 is the last empty line of the test, after </script>. I think that that this is caused by automatic line number generation introduced in r136657. I could never reproduce the failure locally. In success case, here is what performs the logging:

#0    0x00000001042b6e1e in WebCore::PageConsole::addMessage(WebCore::MessageSource, WebCore::MessageLevel, WTF::String const&, unsigned long, WebCore::Document*) at /Users/ap/Safari/OpenSource/Source/WebCore/page/PageConsole.cpp:141
#1    0x00000001035802be in WebCore::Document::addConsoleMessage(WebCore::MessageSource, WebCore::MessageLevel, WTF::String const&, unsigned long) at /Users/ap/Safari/OpenSource/Source/WebCore/dom/Document.cpp:4819
#2    0x000000010328e1eb in WebCore::CanvasRenderingContext2D::getImageData(WebCore::ImageBuffer::CoordinateSystem, float, float, float, float, int&) const at /Users/ap/Safari/OpenSource/Source/WebCore/html/canvas/CanvasRenderingContext2D.cpp:1844
#3    0x000000010328e0bb in WebCore::CanvasRenderingContext2D::getImageData(float, float, float, float, int&) const at /Users/ap/Safari/OpenSource/Source/WebCore/html/canvas/CanvasRenderingContext2D.cpp:1832
#4    0x0000000103c74ccf in WebCore::jsCanvasRenderingContext2DPrototypeFunctionGetImageData(JSC::ExecState*) at /Users/ap/Safari/OpenSource/WebKitBuild/Debug/DerivedSources/WebCore/JSCanvasRenderingContext2D.cpp:2601
#5    0x00002706bb201045 in 0x2706bb201045 ()
#6    0x000000010190c5f7 in JSC::JITCode::execute(JSC::JSStack*, JSC::ExecState*, JSC::VM*) at /Users/ap/Safari/OpenSource/Source/JavaScriptCore/jit/JITCode.cpp:46
#7    0x00000001018efe2f in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) at /Users/ap/Safari/OpenSource/Source/JavaScriptCore/interpreter/Interpreter.cpp:957
#8    0x000000010167343e in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) at /Users/ap/Safari/OpenSource/Source/JavaScriptCore/runtime/CallData.cpp:39
#9    0x0000000103c5d4ab in WebCore::JSMainThreadExecState::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) at /Users/ap/Safari/OpenSource/Source/WebCore/bindings/js/JSMainThreadExecState.h:52
#10    0x0000000103d907bf in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) at /Users/ap/Safari/OpenSource/Source/WebCore/bindings/js/JSEventListener.cpp:132
#11    0x00000001037337f2 in WebCore::EventTarget::fireEventListeners(WebCore::Event*, WebCore::EventTargetData*, WTF::Vector<WebCore::RegisteredEventListener, 1ul, WTF::CrashOnOverflow>&) at /Users/ap/Safari/OpenSource/Source/WebCore/dom/EventTarget.cpp:272
#12    0x000000010373321e in WebCore::EventTarget::fireEventListeners(WebCore::Event*) at /Users/ap/Safari/OpenSource/Source/WebCore/dom/EventTarget.cpp:228
#13    0x000000010426fad2 in WebCore::Node::handleLocalEvents(WebCore::Event*) at /Users/ap/Safari/OpenSource/Source/WebCore/dom/Node.cpp:2078
#14    0x00000001036ffd11 in WebCore::EventContext::handleLocalEvents(WebCore::Event*) const at /Users/ap/Safari/OpenSource/Source/WebCore/dom/EventContext.cpp:58
#15    0x0000000103701729 in WebCore::EventDispatcher::dispatchEventAtTarget() at /Users/ap/Safari/OpenSource/Source/WebCore/dom/EventDispatcher.cpp:161
#16    0x0000000103700ee9 in WebCore::EventDispatcher::dispatch() at /Users/ap/Safari/OpenSource/Source/WebCore/dom/EventDispatcher.cpp:118
#17    0x0000000103702c2f in WebCore::EventDispatchMediator::dispatchEvent(WebCore::EventDispatcher*) const at /Users/ap/Safari/OpenSource/Source/WebCore/dom/EventDispatchMediator.cpp:54
#18    0x00000001037004a2 in WebCore::EventDispatcher::dispatchEvent(WebCore::Node*, WTF::PassRefPtr<WebCore::EventDispatchMediator>) at /Users/ap/Safari/OpenSource/Source/WebCore/dom/EventDispatcher.cpp:52
#19    0x000000010426fc4b in WebCore::Node::dispatchEvent(WTF::PassRefPtr<WebCore::Event>) at /Users/ap/Safari/OpenSource/Source/WebCore/dom/Node.cpp:2099
#20    0x00000001039abdb4 in WebCore::HTMLImageLoader::dispatchLoadEvent() at /Users/ap/Safari/OpenSource/Source/WebCore/html/HTMLImageLoader.cpp:58
#21    0x0000000103a9aefc in WebCore::ImageLoader::dispatchPendingLoadEvent() at /Users/ap/Safari/OpenSource/Source/WebCore/loader/ImageLoader.cpp:435
#22    0x0000000103a9ae26 in WebCore::ImageLoader::dispatchPendingEvent(WebCore::EventSender<WebCore::ImageLoader>*) at /Users/ap/Safari/OpenSource/Source/WebCore/loader/ImageLoader.cpp:393
#23    0x0000000103a9b6ac in WebCore::EventSender<WebCore::ImageLoader>::dispatchPendingEvents() at /Users/ap/Safari/OpenSource/Source/WebCore/dom/EventSender.h:106
#24    0x0000000103a9b011 in WebCore::ImageLoader::dispatchPendingLoadEvents() at /Users/ap/Safari/OpenSource/Source/WebCore/loader/ImageLoader.cpp:462
#25    0x0000000103574647 in WebCore::Document::implicitClose() at /Users/ap/Safari/OpenSource/Source/WebCore/dom/Document.cpp:2430
#26    0x00000001037f69cb in WebCore::FrameLoader::checkCallImplicitClose() at /Users/ap/Safari/OpenSource/Source/WebCore/loader/FrameLoader.cpp:850
#27    0x00000001037f6646 in WebCore::FrameLoader::checkCompleted() at /Users/ap/Safari/OpenSource/Source/WebCore/loader/FrameLoader.cpp:793
#28    0x00000001037f6815 in WebCore::FrameLoader::loadDone() at /Users/ap/Safari/OpenSource/Source/WebCore/loader/FrameLoader.cpp:739
#29    0x00000001032764d2 in WebCore::CachedResourceLoader::loadDone(WebCore::CachedResource*) at /Users/ap/Safari/OpenSource/Source/WebCore/loader/cache/CachedResourceLoader.cpp:772
#30    0x000000010480ba80 in WebCore::SubresourceLoader::notifyDone() at /Users/ap/Safari/OpenSource/Source/WebCore/loader/SubresourceLoader.cpp:351
#31    0x000000010480b99c in WebCore::SubresourceLoader::didFinishLoading(double) at /Users/ap/Safari/OpenSource/Source/WebCore/loader/SubresourceLoader.cpp:290
#32    0x0000000104637db5 in WebCore::ResourceLoader::didFinishLoading(WebCore::ResourceHandle*, double) at /Users/ap/Safari/OpenSource/Source/WebCore/loader/ResourceLoader.cpp:489

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