[Webkit-unassigned] [Bug 217684] New: REGRESSION (r268384): ASSERTION FAILED: _startCount > 1 in -[WKMouseDeviceObserver stop]

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217684

            Bug ID: 217684
           Summary: REGRESSION (r268384): ASSERTION FAILED: _startCount >
                    1 in -[WKMouseDeviceObserver stop]
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryanhaddad at apple.com

Seeing the following assertion failure with 8 API tests on iOS Debug bots after https://trac.webkit.org/changeset/268384/webkit

        ASSERTION FAILED: _startCount > 1
        /Volumes/Data/slave/ios-simulator-14-debug/build/Source/WebKit/UIProcess/ios/WKMouseDeviceObserver.mm(61) : -[WKMouseDeviceObserver stop]
        1   0x104327f09 WTFCrash
        2   0x10e73db2b WTFCrashWithInfo(int, char const*, char const*, int)
        3   0x10f7ded25 -[WKMouseDeviceObserver stop]
        4   0x10f80ac33 WebKit::WebProcessProxy::platformDestroy()
        5   0x10f615fe6 WebKit::WebProcessProxy::~WebProcessProxy()
        6   0x10f616665 WebKit::WebProcessProxy::~WebProcessProxy()
        7   0x10f6166ec WebKit::WebProcessProxy::~WebProcessProxy()
        8   0x10f2b4ed4 WTF::ThreadSafeRefCounted<WebKit::WebProcessProxy, (WTF::DestructionThread)0>::deref() const::'lambda'()::operator()() const
        9   0x10f2b4e6d WTF::ThreadSafeRefCounted<WebKit::WebProcessProxy, (WTF::DestructionThread)0>::deref() const
        10  0x10f2b4e1e WebKit::WebProcessProxy::deref()
        11  0x10f2b4def WTF::Ref<WebKit::WebProcessProxy, WTF::DumbPtrTraits<WebKit::WebProcessProxy> >::~Ref()
        12  0x10f281845 WTF::Ref<WebKit::WebProcessProxy, WTF::DumbPtrTraits<WebKit::WebProcessProxy> >::~Ref()
        13  0x10f62ad98 WebKit::WebPageProxy::close()::$_6::~$_6()
        14  0x10f5bc205 WebKit::WebPageProxy::close()::$_6::~$_6()
        15  0x10f65cfe5 WTF::Detail::CallableWrapper<WebKit::WebPageProxy::close()::$_6, void>::~CallableWrapper()
        16  0x10f65ce45 WTF::Detail::CallableWrapper<WebKit::WebPageProxy::close()::$_6, void>::~CallableWrapper()
        17  0x10f65ce6c WTF::Detail::CallableWrapper<WebKit::WebPageProxy::close()::$_6, void>::~CallableWrapper()
        18  0x10433d63f std::__1::default_delete<WTF::Detail::CallableWrapperBase<void> >::operator()(WTF::Detail::CallableWrapperBase<void>*) const
        19  0x10433d5bf std::__1::unique_ptr<WTF::Detail::CallableWrapperBase<void>, std::__1::default_delete<WTF::Detail::CallableWrapperBase<void> > >::reset(WTF::Detail::CallableWrapperBase<void>*)
        20  0x10433d559 std::__1::unique_ptr<WTF::Detail::CallableWrapperBase<void>, std::__1::default_delete<WTF::Detail::CallableWrapperBase<void> > >::~unique_ptr()
        21  0x10433d535 std::__1::unique_ptr<WTF::Detail::CallableWrapperBase<void>, std::__1::default_delete<WTF::Detail::CallableWrapperBase<void> > >::~unique_ptr()
        22  0x10433d515 WTF::Function<void ()>::~Function()
        23  0x10433c485 WTF::Function<void ()>::~Function()
        24  0x1043d0f0e WTF::RunLoop::performWork()
        25  0x1043d5641 WTF::RunLoop::performWork(void*)
        26  0x136f63845 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
        27  0x136f6373d __CFRunLoopDoSource0
        28  0x136f62c1f __CFRunLoopDoSources0
        29  0x136f5d3f7 __CFRunLoopRun
        30  0x136f5cb9e CFRunLoopRunSpecific
        31  0x1369b0e61 -[NSRunLoop(NSRunLoop) runMode:beforeDate:]
        Child process terminated with signal 11: Segmentation fault
        SHOULD NEVER BE REACHED
        /Volumes/Data/slave/ios-simulator-14-debug/build/Source/WebKit/Shared/Authentication/cocoa/AuthenticationManagerCocoa.mm(45) : virtual void WebKit::AuthenticationManager::initializeConnection(IPC::Connection *)


https://build.webkit.org/builders/Apple-iOS-14-Simulator-Debug-WK2-Tests/builds/244/steps/run-api-tests/logs/stdio

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