[Webkit-unassigned] [Bug 191812] Regression(r238330) ProcessSwap.WebInspector API test is a flaky crash in debug

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191812

--- Comment #3 from Ryosuke Niwa <rniwa at webkit.org> ---
I can reproduce it locally on iMac Pro:

$ ./Tools/Scripts/run-api-tests --debug ProcessSwap.WebInspector
Running tests       
    _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
    Received data during response processing, queuing it.
    _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
    _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
    ASSERTION FAILED: !m_frontendConnection
    /Volumes/Data/webkit2/Source/WebKit/WebProcess/WebPage/WebInspector.cpp(80) : void WebKit::WebInspector::setFrontendConnection(IPC::Attachment)
    1   0x11f66f419 WTFCrash
    2   0x10af0d19b WTFCrashWithInfo(int, char const*, char const*, int)
    3   0x10bf349ea WebKit::WebInspector::setFrontendConnection(IPC::Attachment)
    4   0x10bff5d78 void IPC::callMemberFunctionImpl<WebKit::WebInspector, void (WebKit::WebInspector::*)(IPC::Attachment), std::__1::tuple<IPC::Attachment>, 0ul>(WebKit::WebInspector*, void (WebKit::WebInspector::*)(IPC::Attachment), std::__1::tuple<IPC::Attachment>&&, std::__1::integer_sequence<unsigned long, 0ul>)
    5   0x10bff5ca0 void IPC::callMemberFunction<WebKit::WebInspector, void (WebKit::WebInspector::*)(IPC::Attachment), std::__1::tuple<IPC::Attachment>, std::__1::integer_sequence<unsigned long, 0ul> >(std::__1::tuple<IPC::Attachment>&&, WebKit::WebInspector*, void (WebKit::WebInspector::*)(IPC::Attachment))
    6   0x10bff56d4 void IPC::handleMessage<Messages::WebInspector::SetFrontendConnection, WebKit::WebInspector, void (WebKit::WebInspector::*)(IPC::Attachment)>(IPC::Decoder&, WebKit::WebInspector*, void (WebKit::WebInspector::*)(IPC::Attachment))
    7   0x10bff495c WebKit::WebInspector::didReceiveMessage(IPC::Connection&, IPC::Decoder&)
    8   0x10c01efe2 WebKit::WebPage::didReceiveMessage(IPC::Connection&, IPC::Decoder&)
    9   0x10afbc5da IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&)
    10  0x10bcbc45d WebKit::WebProcess::didReceiveMessage(IPC::Connection&, IPC::Decoder&)
    11  0x10af5466c IPC::Connection::dispatchMessage(IPC::Decoder&)
    12  0x10af46a51 IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)
    13  0x10af55437 IPC::Connection::dispatchOneIncomingMessage()
    14  0x10af75f68 IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14::operator()()
    15  0x10af75e79 WTF::Function<void ()>::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14>::call()
    16  0x11f696c5d WTF::Function<void ()>::operator()() const
    17  0x11f6ef90d WTF::RunLoop::performWork()
    18  0x11f6f01b4 WTF::RunLoop::performWork(void*)
...
    Received data during response processing, queuing it.
    Received data during response processing, queuing it.
    LEAK: 2 WebProcessPool

    /Volumes/Data/webkit2/Tools/TestWebKitAPI/Tests/WebKitCocoa/ProcessSwapOnNavigation.mm:2076
    Expected: (pid2) != (pid3), actual: 36821 vs 36821


    /Volumes/Data/webkit2/Tools/TestWebKitAPI/Tests/WebKitCocoa/ProcessSwapOnNavigation.mm:2077
    Expected equality of these values:
      numberOfDecidePolicyCalls
        Which is: 4
      3

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