Faulting module name: twinapi.appcore.dll

We are experiencing an intermittent, unpredictable crash in our built WMR side-loaded app. This only happens sometimes, and we can't reliably reproduce it. We have a multiplayer app with several people joining from different geographical locations, in both our WMR and Rift PC apps. However, only the WMR backpacks are crashing intermittently, unpredictably. No exception from Unity. The crash manifests itself as the client returning the the "cliff house" and the app has exited, I think unbeknownst to Unity or the Unity wsa player. No application on quit debug logs are being spit out.

Anybody ever seen anything like this?

Faulting application name: <our app name>.exe, version: 0.0.0.0, time stamp: 0x5cf8812b
Faulting module name: twinapi.appcore.dll, version: 10.0.17763.292, time stamp: 0x270a22eb
Exception code: 0xc000027b
Fault offset: 0x00000000000bd588
Faulting process id: 0x1258
Faulting application start time: 0x01d51c8d99b2f5f2
Faulting application path: C:\Program Files\WindowsApps\<our app name>Unity_1.6.35.0_x64__k4r82w3e9qe04<our app name>.exe
Faulting module path: C:\Windows\System32\twinapi.appcore.dll
Report Id: 1a9598b3-1100-4a54-985f-672ebbf0bda0
Faulting package full name: <our app name>Unity_1.6.35.0_x64__k4r82w3e9qe04
Faulting package-relative application ID: App

We're building with Unity 2018.4.1

 

We get nothing in the unity log.

 

Sure, we'll try that, what kind of information will this provide?

 

So, I've got a full dump file. I've opened it in VS. I'm trying to see what information I can glean from this. Do you know where I should be looking? The dump file is 3.75 gb.

Code (CSharp):

1. >    KERNELBASE.dll!RaiseFailFastException()    Unknown
2.      combase.dll!RoFailFastWithErrorContextInternal2(HRESULT hrError, unsigned long cStowedExceptions, _STOWED_EXCEPTION_INFORMATION_V2 * * aStowedExceptionPointers) Line 1459    C++
3.      twinapi.appcore.dll!Windows::ApplicationModel::Core::CoreApplication::ForwardLocalError(struct IRestrictedErrorInfo *)    Unknown
4.      twinapi.appcore.dll!Windows::ApplicationModel::Core::CoreApplicationFactory::ForwardLocalError(struct IRestrictedErrorInfo *)    Unknown
5.      combase.dll!CallErrorForwarder(void * hProcess, int fLocal, IRestrictedErrorInfo * pRestrictedErrorInfo) Line 1619    C++
6.      combase.dll!RoReportFailedDelegate(IUnknown * punkDelegate, IRestrictedErrorInfo * pRestrictedErrorInfo) Line 1709    C++
7.      Windows.Networking.dll!Microsoft::WRL::InvokeTraits<-2>::InvokeDelegates<<lambda_64eaff0a44965e4df01bec2336245ad9>,Windows::Foundation::ITypedEventHandler<Windows::Networking::Sockets::StreamSocketListener * __ptr64,Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs * __ptr64> >(Microsoft::WRL::EventSource<Windows::Foundation::ITypedEventHandler<Windows::Networking::Sockets::StreamSocketListener *,Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs *>,Microsoft::WRL::InvokeModeOptions<-2> >::InvokeAll::__l2::<lambda_64eaff0a44965e4df01bec2336245ad9> invokeOne, Microsoft::WRL::Details::EventTargetArray * targetArray, Microsoft::WRL::EventSource<Windows::Foundation::ITypedEventHandler<Windows::Networking::Sockets::StreamSocketListener *,Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs *>,Microsoft::WRL::InvokeModeOptions<-2> > * pEvent) Line 151    C++
8.      [Inline Frame] Windows.Networking.dll!Microsoft::WRL::EventSource<Windows::Foundation::ITypedEventHandler<Windows::Networking::Sockets::DatagramSocket *,Windows::Networking::Sockets::DatagramSocketMessageReceivedEventArgs *>,Microsoft::WRL::InvokeModeOptions<-2> >::DoInvoke(Microsoft::WRL::EventSource<Windows::Foundation::ITypedEventHandler<Windows::Networking::Sockets::DatagramSocket *,Windows::Networking::Sockets::DatagramSocketMessageReceivedEventArgs *>,Microsoft::WRL::InvokeModeOptions<-2> >::InvokeAll::__l2::<lambda_046ddf79071240c46888872ccdba166e>) Line 810    C++
9.      [Inline Frame] Windows.Networking.dll!Microsoft::WRL::EventSource<Windows::Foundation::ITypedEventHandler<Windows::Networking::Sockets::DatagramSocket *,Windows::Networking::Sockets::DatagramSocketMessageReceivedEventArgs *>,Microsoft::WRL::InvokeModeOptions<-2> >::InvokeAll(Windows::Networking::Sockets::IDatagramSocket * <args_0>, DatagramSocketMessageReceivedEventArgsServer * <args_1>) Line 820    C++
10.      Windows.Networking.dll!DatagramSocketReadOperationServer::IoCompletedCore(HRESULT ioResult, unsigned int numberOfBytesTransferred, Windows::Networking::Sockets::IDatagramSocket * datagramSocket) Line 143    C++
11.      Windows.Networking.dll!DatagramSocketReadOperationServer::IoCompleted(HRESULT ioResult, unsigned int numberOfBytesTransferred, IInspectable * context) Line 84    C++
12.      Windows.Networking.dll!SocketIoContext::Invoke(IMFAsyncResult * result) Line 107    C++
13.      RTWorkQ.dll!TPIoCompletionCallback()    Unknown
14.      KERNELBASE.dll!BasepTpIoCallback()    Unknown
15.      ntdll.dll!TppIopExecuteCallback()    Unknown
16.      ntdll.dll!TppWorkerThread()    Unknown
17.      kernel32.dll!BaseThreadInitThunk()    Unknown
18.      ntdll.dll!RtlUserThreadStart()    Unknown
19.  

 

Well, we see in our code where we are using a delegate to read from a DatagramSocket for UWP, because UdpClient wasn't supported previously. ... This looks like it would relate to this callstack. We're trying to figure out what would be wrong in this small little function which reads from a datagram socket.