Description: imported/w3c/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-addtrack-kind.html This is a pre-existing flaky failure only on ews. This particular instance was a crash. History: https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fsemantics%2Fembedded-content%2Fmedia-elements%2Ftrack%2Ftrack-element%2Ftrack-addtrack-kind.html&flavor=wk1&style=debug&platform=mac&limit=50000 Crash Log: No crash log found for DumpRenderTree:30469. stdout: stderr: ASSERTION FAILED: m_wrapper ./bindings/js/JSEventListener.h(125) : JSC::JSObject *WebCore::JSEventListener::ensureJSFunction(WebCore::ScriptExecutionContext &) const 1 0x1096ecfb9 WTFCrash 2 0x11d49ba3b WTFCrashWithInfo(int, char const*, char const*, int) 3 0x11fb5ce59 WebCore::JSEventListener::ensureJSFunction(WebCore::ScriptExecutionContext&) const 4 0x11fb5c16b WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) 5 0x12025f21b WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener, WTF::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::EventTarget::EventInvokePhase)
<rdar://problem/66186856>
Here is the complete backtrace: ASSERTION FAILED: m_wrapper ./bindings/js/JSEventListener.h(125) : JSC::JSObject *WebCore::JSEventListener::ensureJSFunction(WebCore::ScriptExecutionContext &) const 1 0x1096ecfb9 WTFCrash 2 0x11d49ba3b WTFCrashWithInfo(int, char const*, char const*, int) 3 0x11fb5ce59 WebCore::JSEventListener::ensureJSFunction(WebCore::ScriptExecutionContext&) const 4 0x11fb5c16b WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) 5 0x12025f21b WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener, WTF::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::EventTarget::EventInvokePhase) 6 0x12025b3fe WebCore::EventTarget::fireEventListeners(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) 7 0x1202e836a WebCore::Node::handleLocalEvents(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) 8 0x120246770 WebCore::EventContext::handleLocalEvents(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) const 9 0x1202471a7 WebCore::dispatchEventInDOM(WebCore::Event&, WebCore::EventPath const&) 10 0x120246da5 WebCore::EventDispatcher::dispatchEvent(WebCore::Node&, WebCore::Event&) 11 0x1202e83bd WebCore::Node::dispatchEvent(WebCore::Event&) 12 0x12078dfde WebCore::HTMLTrackElement::didCompleteLoad(WebCore::HTMLTrackElement::LoadStatus) 13 0x1209acd80 WebCore::LoadableTextTrack::cueLoadingCompleted(WebCore::TextTrackLoader&, bool) 14 0x120e36936 WebCore::TextTrackLoader::cueLoadTimerFired() 15 0x120e54bf1 decltype(*(std::__1::forward<WebCore::TextTrackLoader*&>(fp0)).*fp()) std::__1::__invoke<void (WebCore::TextTrackLoader::*&)(), WebCore::TextTrackLoader*&, void>(void (WebCore::TextTrackLoader::*&&&)(), WebCore::TextTrackLoader*&&&) 16 0x120e54b50 std::__1::__bind_return<void (WebCore::TextTrackLoader::*)(), std::__1::tuple<WebCore::TextTrackLoader*>, std::__1::tuple<>, __is_valid_bind_return<void (WebCore::TextTrackLoader::*)(), std::__1::tuple<WebCore::TextTrackLoader*>, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (WebCore::TextTrackLoader::*)(), std::__1::tuple<WebCore::TextTrackLoader*>, 0ul, std::__1::tuple<> >(void (WebCore::TextTrackLoader::*&)(), std::__1::tuple<WebCore::TextTrackLoader*>&, std::__1::__tuple_indices<0ul>, std::__1::tuple<>&&) 17 0x120e54afc std::__1::__bind_return<void (WebCore::TextTrackLoader::*)(), std::__1::tuple<WebCore::TextTrackLoader*>, std::__1::tuple<>, __is_valid_bind_return<void (WebCore::TextTrackLoader::*)(), std::__1::tuple<WebCore::TextTrackLoader*>, std::__1::tuple<> >::value>::type std::__1::__bind<void (WebCore::TextTrackLoader::*&)(), WebCore::TextTrackLoader*>::operator()<>() 18 0x120e54a99 WTF::Detail::CallableWrapper<std::__1::__bind<void (WebCore::TextTrackLoader::*&)(), WebCore::TextTrackLoader*>, void>::call() 19 0x11d4a9a3a WTF::Function<void ()>::operator()() const 20 0x11d4dc889 WebCore::Timer::fired() 21 0x1212882ea WebCore::ThreadTimers::sharedTimerFiredInternal() 22 0x121291061 WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0::operator()() const 23 0x121291019 WTF::Detail::CallableWrapper<WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0, void>::call() 24 0x11d4a9a3a WTF::Function<void ()>::operator()() const 25 0x121247217 WebCore::MainThreadSharedTimer::fired() 26 0x1212f4c96 WebCore::timerFired(__CFRunLoopTimer*, void*) 27 0x7fff31ddf5d5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ 28 0x7fff31ddf181 __CFRunLoopDoTimer 29 0x7fff31ddecba __CFRunLoopDoTimers 30 0x7fff31dc0304 __CFRunLoopRun 31 0x7fff31dbf855 CFRunLoopRunSpecific