[Webkit-unassigned] [Bug 209684] New: [ Mac Debug ] imported/w3c/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay.html is flaky crashing.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209684

            Bug ID: 209684
           Summary: [ Mac Debug ]
                    imported/w3c/web-platform-tests/html/semantics/embedde
                    d-content/media-elements/ready-states/autoplay.html
                    is flaky crashing.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Lawrence.j at apple.com

Created attachment 394763

  --> https://bugs.webkit.org/attachment.cgi?id=394763&action=review

autoplay-crash-log

imported/w3c/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay.html 

Description:
This test is flaky crashing on Mac Debug. The flaky crashes first appear in the visual history on 03/10/2020.

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fsemantics%2Fembedded-content%2Fmedia-elements%2Fready-states%2Fautoplay.html&platform=mac&style=debug&limit=50000

Crash log attached;
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore            0x000000010a22dce0 WTFCrash + 16 (Assertions.cpp:309)
1   com.apple.WebCore                   0x0000000121ff747b WTFCrashWithInfo(int, char const*, char const*, int) + 27
2   com.apple.WebCore                   0x0000000124369528 WebCore::JSEventListener::ensureJSFunction(WebCore::ScriptExecutionContext&) const + 616 (JSEventListener.h:125)
3   com.apple.WebCore                   0x000000012436884b WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) + 219 (JSEventListener.cpp:113)
4   com.apple.WebCore                   0x0000000124a25e4b WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener, WTF::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::EventTarget::EventInvokePhase) + 1099 (EventTarget.cpp:326)
5   com.apple.WebCore                   0x0000000124a21ff2 WebCore::EventTarget::fireEventListeners(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) + 354 (EventTarget.cpp:257)
6   com.apple.WebCore                   0x0000000124aa6e4a WebCore::Node::handleLocalEvents(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) + 186 (Node.cpp:2365)
7   com.apple.WebCore                   0x0000000124a0d510 WebCore::EventContext::handleLocalEvents(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) const + 192 (EventContext.cpp:55)
8   com.apple.WebCore                   0x0000000124a0e02b WebCore::dispatchEventInDOM(WebCore::Event&, WebCore::EventPath const&) + 379 (EventDispatcher.cpp:101)
9   com.apple.WebCore                   0x0000000124a0db45 WebCore::EventDispatcher::dispatchEvent(WebCore::Node&, WebCore::Event&) + 581 (EventDispatcher.cpp:157)
10  com.apple.WebCore                   0x0000000124aa6e9d WebCore::Node::dispatchEvent(WebCore::Event&) + 29 (Node.cpp:2375)
11  com.apple.WebCore                   0x0000000124e6eb31 WebCore::HTMLMediaElement::dispatchEvent(WebCore::Event&) + 225 (HTMLMediaElement.cpp:5886)
12  com.apple.WebCore                   0x0000000124a44cd0 WebCore::MainThreadGenericEventQueue::dispatchOneEvent() + 608 (GenericEventQueue.cpp:73)
13  com.apple.WebCore                   0x0000000124a4b9e1 decltype(*(std::__1::forward<WebCore::MainThreadGenericEventQueue*&>(fp0)).*fp()) std::__1::__invoke<void (WebCore::MainThreadGenericEventQueue::*&)(), WebCore::MainThreadGenericEventQueue*&, void>(void (WebCore::MainThreadGenericEventQueue::*&&&)(), WebCore::MainThreadGenericEventQueue*&&&) + 113 (type_traits:4280)

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