[Webkit-unassigned] [Bug 238865] Using 'opener' to open a page with more than one canvas element causes the process to hang

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238865

--- Comment #4 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
WebContent is blocked on:

    +             !                   :                   8990 WebCore::RenderHTMLCanvas::paintReplaced(WebCore::PaintInfo&, WebCore::LayoutPoint const&)  (in WebCore) + 705  [0x5332bf4b1]
    +             !                   :                     8990 WebCore::HTMLCanvasElement::paint(WebCore::GraphicsContext&, WebCore::LayoutRect const&)  (in WebCore) + 695  [0x5346f4ae7]
    +             !                   :                       8989 WebCore::ConcreteImageBuffer<WebKit::ImageBufferShareableMappedIOSurfaceBackend>::draw(WebCore::GraphicsContext&, WebCore::FloatRect const&, WebCore::FloatRect const&, WebCore::ImagePaintingOptions const&)  (in WebKit) + 53  [0x52ad64c41]
    +             !                   :                       | 8988 WebKit::RemoteImageBufferProxy<WebKit::ImageBufferShareableMappedIOSurfaceBackend>::flushDrawingContext()  (in WebKit) + 142  [0x52b2ed702]
    +             !                   :                       | + 8987 WebKit::RemoteRenderingBackendProxy::waitForDidFlush()  (in WebKit) + 90  [0x52b28077c]
    +             !                   :                       | + ! 8987 IPC::Connection::waitForMessage(IPC::MessageName, unsigned long long, IPC::Timeout, WTF::OptionSet<IPC::WaitForOption>)  (in WebKit) + 458  [0x52af43214]
    +             !                   :                       | + !   8987 bool WTF::Condition::waitUntilUnchecked<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&)  (in WebKit) + 154  [0x52ac03f64]
    +             !                   :                       | + !     8986 WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&)  (in JavaScriptCore) + 2263  [0x529ae0057]
    +             !                   :                       | + !     : 8986 _pthread_cond_wait  (in libsystem_pthread.dylib) + 1249  [0x7ff804c7ea4f]
    +             !                   :                       | + !     :   8986 __psynch_cvwait  (in libsystem_kernel.dylib) + 10  [0x7ff804c4440a]
    +             !                   :                       | + !     1 WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&)  (in JavaScriptCore) + 114  [0x529adf7f2]

GPU Process is idle.

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