Seeing layout tests exit early on Catalina debug WK2 with the following assertion failure: ASSERTION FAILED: Completion handler should always be called !m_function /Volumes/Data/slave/catalina-debug/build/WebKitBuild/Debug/usr/local/include/wtf/CompletionHandler.h(58) : WTF::CompletionHandler<void ()>::~CompletionHandler() 1 0x31b140aa9 WTFCrash 2 0x2e8146647 WTF::CompletionHandler<void ()>::~CompletionHandler() 3 0x2e8143cb5 WTF::CompletionHandler<void ()>::~CompletionHandler() 4 0x2e8d8c7ff WTF::VectorDestructor<true, WTF::CompletionHandler<void ()> >::destruct(WTF::CompletionHandler<void ()>*, WTF::CompletionHandler<void ()>*) 5 0x2e8d8c76d WTF::VectorTypeOperations<WTF::CompletionHandler<void ()> >::destruct(WTF::CompletionHandler<void ()>*, WTF::CompletionHandler<void ()>*) 6 0x2e8d8c730 WTF::Vector<WTF::CompletionHandler<void ()>, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::~Vector() 7 0x2e8d412c5 WTF::Vector<WTF::CompletionHandler<void ()>, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::~Vector() 8 0x2e989c983 WebKit::TiledCoreAnimationDrawingArea::~TiledCoreAnimationDrawingArea() 9 0x2e989cb75 WebKit::TiledCoreAnimationDrawingArea::~TiledCoreAnimationDrawingArea() 10 0x2e989cb9c WebKit::TiledCoreAnimationDrawingArea::~TiledCoreAnimationDrawingArea() 11 0x2e9f8b05f std::__1::default_delete<WebKit::DrawingArea>::operator()(WebKit::DrawingArea*) const 12 0x2e9f8afdf std::__1::unique_ptr<WebKit::DrawingArea, std::__1::default_delete<WebKit::DrawingArea> >::reset(WebKit::DrawingArea*) 13 0x2e9f57117 std::__1::unique_ptr<WebKit::DrawingArea, std::__1::default_delete<WebKit::DrawingArea> >::operator=(std::nullptr_t) 14 0x2e9f569cf WebKit::WebPage::close() 15 0x2e9fe8d84 void IPC::callMemberFunctionImpl<WebKit::WebPage, void (WebKit::WebPage::*)(), std::__1::tuple<> >(WebKit::WebPage*, void (WebKit::WebPage::*)(), std::__1::tuple<>&&, std::__1::integer_sequence<unsigned long>) 16 0x2e9fe8ce0 void IPC::callMemberFunction<WebKit::WebPage, void (WebKit::WebPage::*)(), std::__1::tuple<>, std::__1::integer_sequence<unsigned long> >(std::__1::tuple<>&&, WebKit::WebPage*, void (WebKit::WebPage::*)()) 17 0x2e9fcc7e6 void IPC::handleMessage<Messages::WebPage::Close, WebKit::WebPage, void (WebKit::WebPage::*)()>(IPC::Decoder&, WebKit::WebPage*, void (WebKit::WebPage::*)()) 18 0x2e9fc3a8a WebKit::WebPage::didReceiveWebPageMessage(IPC::Connection&, IPC::Decoder&) 19 0x2e9f66cfe WebKit::WebPage::didReceiveMessage(IPC::Connection&, IPC::Decoder&) 20 0x2e84d6b21 IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&) 21 0x2e997f0d7 WebKit::WebProcess::didReceiveMessage(IPC::Connection&, IPC::Decoder&) 22 0x2e807a104 IPC::Connection::dispatchMessage(IPC::Decoder&) 23 0x2e807b1e0 IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) 24 0x2e807b870 IPC::Connection::dispatchOneIncomingMessage() 25 0x2e809c878 IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_8::operator()() 26 0x2e809c78e WTF::Detail::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_8, void>::call() 27 0x31b16c002 WTF::Function<void ()>::operator()() const 28 0x31b1ed305 WTF::RunLoop::performWork() 29 0x31b1f1af1 WTF::RunLoop::performWork(void*) 30 0x7fff2e618d52 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ 31 0x7fff2e618cf1 __CFRunLoopDoSource0 LEAK: 1 WebPageProxy https://build.webkit.org/results/Apple-Catalina-Debug-WK2-Tests/r272703%20(78)/results.html
<rdar://problem/74220237>
Not limited to Catalina, this in-progress Big Sur run is also exited layout tests early: https://build.webkit.org/#/builders/23/builds/77 I'll just revert the change for now.
Reverted r272702 for reason: Caused assertion failure on macOS debug WK2 bots Committed r272705: <https://trac.webkit.org/changeset/272705>