Close accept loop when closing connection

src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/MsQuic/MsQuicConnection.cs

@@ -161,21 +161,21 @@ private uint HandleEventShutdownInitiatedByTransport(ref ConnectionEvent connect
                 _connectTcs.SetException(ExceptionDispatchInfo.SetCurrentStackTrace(ex));
             }
 
-            _acceptQueue.Writer.Complete();
-
             return MsQuicStatusCodes.Success;
         }
 
         private uint HandleEventShutdownInitiatedByPeer(ref ConnectionEvent connectionEvent)
         {
             _abortErrorCode = connectionEvent.Data.ShutdownInitiatedByPeer.ErrorCode;
-            _acceptQueue.Writer.Complete();
             return MsQuicStatusCodes.Success;
         }
 
         private uint HandleEventShutdownComplete(ref ConnectionEvent connectionEvent)
         {
             _shutdownTcs.SetResult(MsQuicStatusCodes.Success);
+
+            // Stop accepting new streams.
+            _acceptQueue?.Writer.Complete();
             return MsQuicStatusCodes.Success;
         }
 
@@ -291,7 +291,7 @@ private MsQuicStream StreamOpen(
 
         private void SetCallbackHandler()
         {
-            Debug.Assert(!_handle.IsAllocated);
+            Debug.Assert(!_handle.IsAllocated, "callback handler allocated already");
             _handle = GCHandle.Alloc(this);
 
             MsQuicApi.Api.SetCallbackHandlerDelegate(
@@ -310,8 +310,6 @@ private ValueTask ShutdownAsync(
                 ErrorCode);
             QuicExceptionHelpers.ThrowIfFailed(status, "Failed to shutdown connection.");
 
-            Debug.Assert(_shutdownTcs.Task.IsCompleted == false);
-
             return new ValueTask(_shutdownTcs.Task);
         }
 

src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/MsQuic/MsQuicListener.cs

@@ -34,7 +34,7 @@ internal sealed class MsQuicListener : QuicListenerProvider, IDisposable
         private QuicListenerOptions _options;
         private volatile bool _disposed;
         private IPEndPoint _listenEndPoint;
-
+        private bool _started;
         private readonly Channel<MsQuicConnection> _acceptConnectionQueue;
 
         internal MsQuicListener(QuicListenerOptions options)
@@ -120,6 +120,13 @@ internal override void Start()
         {
             ThrowIfDisposed();
 
+            // protect against double starts.
+            if (_started)
+            {
+                throw new QuicException("Cannot start Listener multiple times");
+            }
+
+            _started = true;
             SetCallbackHandler();
 
             SOCKADDR_INET address = MsQuicAddressHelpers.IPEndPointToINet(_listenEndPoint);
@@ -186,7 +193,7 @@ internal unsafe uint ListenerCallbackHandler(ref ListenerEvent evt)
 
         private void StopAcceptingConnections()
         {
-            _acceptConnectionQueue.Writer.TryComplete();
+            _acceptConnectionQueue?.Writer.TryComplete();
         }
 
         private static uint NativeCallbackHandler(
@@ -202,7 +209,7 @@ private static uint NativeCallbackHandler(
 
         internal void SetCallbackHandler()
         {
-            Debug.Assert(!_handle.IsAllocated);
+            Debug.Assert(!_handle.IsAllocated, "listener allocated");
             _handle = GCHandle.Alloc(this);
 
             MsQuicApi.Api.SetCallbackHandlerDelegate(

src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/MsQuic/MsQuicStream.cs

@@ -71,7 +71,7 @@ internal sealed class MsQuicStream : QuicStreamProvider
         // Creates a new MsQuicStream
         internal MsQuicStream(MsQuicConnection connection, QUIC_STREAM_OPEN_FLAG flags, IntPtr nativeObjPtr, bool inbound)
         {
-            Debug.Assert(connection != null);
+            Debug.Assert(connection != null, "Connection null");
 
             _ptr = nativeObjPtr;
 
@@ -936,7 +936,7 @@ private unsafe ValueTask SendReadOnlyMemoryListAsync(
         /// </summary>
         private void StartLocalStream()
         {
-            Debug.Assert(!_started);
+            Debug.Assert(!_started, "start local stream");
             uint status = MsQuicApi.Api.StreamStartDelegate(
               _ptr,
               (uint)QUIC_STREAM_START_FLAG.ASYNC);

src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicTests.cs

@@ -177,6 +177,23 @@ public async Task CallDifferentWriteMethodsWorks()
             Assert.Equal(24, res);
         }
 
+        [Fact]
+        public async Task CloseAsync_ByServer_AcceptThrows()
+        {
+            await RunClientServer(
+                clientConnection =>
+                {
+                    return Task.CompletedTask;
+                },
+                async serverConnection =>
+                {
+                    var acceptTask = serverConnection.AcceptStreamAsync();
+                    await serverConnection.CloseAsync(errorCode: 0);
+                    // make sure 
+                    await Assert.ThrowsAsync<QuicOperationAbortedException>(() => acceptTask.AsTask());
+                });
+        }
+
         private static ReadOnlySequence<byte> CreateReadOnlySequenceFromBytes(byte[] data)
         {
             List<byte[]> segments = new List<byte[]>

src/libraries/System.Net.Quic/tests/FunctionalTests/QuicListenerTests.cs

@@ -21,10 +21,11 @@ await Task.Run(async () =>
                 using QuicListener listener = CreateQuicListener();
 
                 using QuicConnection clientConnection = CreateQuicConnection(listener.ListenEndPoint);
-                await clientConnection.ConnectAsync();
+                var clientStreamTask = clientConnection.ConnectAsync();
 
                 using QuicConnection serverConnection = await listener.AcceptConnectionAsync();
-            }).TimeoutAfter(millisecondsTimeout: 5_000);
+                await clientStreamTask;
+            }).TimeoutAfter(millisecondsTimeout: 6_000);
         }
     }
 

src/libraries/System.Net.Quic/tests/FunctionalTests/QuicStreamTests.cs

@@ -305,8 +305,6 @@ public async Task LargeDataSentAndReceived()
             }
         }
 
-
-
         [Fact]
         public async Task TestStreams()
         {