Lazy create ResourceInvoker.InvokeAlwaysRunResultFilters statemachine

src/Mvc/Mvc.Core/src/Infrastructure/ResourceInvoker.cs

@@ -1011,7 +1011,9 @@ namespace Microsoft.AspNetCore.Mvc.Infrastructure
             }
         }
 
-        private async Task InvokeAlwaysRunResultFilters()
+        private Task InvokeAlwaysRunResultFilters()
+        {
+            try
             {
                 var next = State.ResultBegin;
                 var scope = Scope.Invoker;
@@ -1020,7 +1022,30 @@ namespace Microsoft.AspNetCore.Mvc.Infrastructure
 
                 while (!isCompleted)
                 {
-                await ResultNext<IAlwaysRunResultFilter, IAsyncAlwaysRunResultFilter>(ref next, ref scope, ref state, ref isCompleted);
+                    var lastTask = ResultNext<IAlwaysRunResultFilter, IAsyncAlwaysRunResultFilter>(ref next, ref scope, ref state, ref isCompleted);
+                    if (!lastTask.IsCompletedSuccessfully)
+                    {
+                        return Awaited(this, lastTask, next, scope, state, isCompleted);
+                    }
+                }
+
+                return Task.CompletedTask;
+            }
+            catch (Exception ex)
+            {
+                // Wrap non task-wrapped exceptions in a Task, 
+                // as this isn't done automatically since the method is not async.
+                return Task.FromException(ex);
+            }
+
+            static async Task Awaited(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
+            {
+                await lastTask;
+
+                while (!isCompleted)
+                {
+                    await invoker.ResultNext<IAlwaysRunResultFilter, IAsyncAlwaysRunResultFilter>(ref next, ref scope, ref state, ref isCompleted);
+                }
             }
         }