it should be volatile, I think

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@23531 71c3de6d-444a-0410-be80-ed276b4c234a

remoting/src/main/java/hudson/remoting/Request.java

@@ -171,7 +171,7 @@ abstract class Request<RSP extends Serializable,EXC extends Throwable> extends C
 
         return new hudson.remoting.Future<RSP>() {
 
-            private boolean cancelled;
+            private volatile boolean cancelled;
 
             public boolean cancel(boolean mayInterruptIfRunning) {
                 if (cancelled || isDone()) {