Unregister temp actor if ask operation got canceled.

src/core/Akka.Tests/Actor/AskTimeoutSpec.cs

@@ -50,5 +50,25 @@ public async Task Ask_should_honor_config_specified_timeout()
             }
         }
 
+        [Fact]
+        public async Task TimedOut_ask_should_remove_temp_actor()
+        {
+            var actor = Sys.ActorOf<SleepyActor>();
+
+            var actorCell = actor as ActorRefWithCell;
+            var container = actorCell.Provider.TempContainer as VirtualPathContainer;
+            try
+            {
+                await actor.Ask<string>("should time out");
+            }
+            catch (Exception)
+            {
+                var childCounter = 0;
+                container.ForEachChild(x => childCounter++);
+                Assert.True(childCounter==0,"Number of children in temp container should be 0.");
+            }
+
+        }
+
     }
 }

src/core/Akka/Actor/Futures.cs

@@ -66,15 +66,20 @@ private static Task<object> Ask(ICanTell self, object message, IActorRefProvider
 
             timeout = timeout ?? provider.Settings.AskTimeout;
 
+            //create a new tempcontainer path
+            ActorPath path = provider.TempPath();
+
             if (timeout != Timeout.InfiniteTimeSpan && timeout.Value > default(TimeSpan))
             {
                 timeoutCancellation = new CancellationTokenSource();
-                timeoutCancellation.Token.Register(() => result.TrySetCanceled());
+                timeoutCancellation.Token.Register(() =>
+                {
+                    result.TrySetCanceled();
+                    provider.UnregisterTempActor(path);
+                });
                 timeoutCancellation.CancelAfter(timeout.Value);
             }
 
-            //create a new tempcontainer path
-            ActorPath path = provider.TempPath();
             //callback to unregister from tempcontainer
             Action unregister =
                 () =>