inconsistent synchronization

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@11304 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/Actionable.java

@@ -19,7 +19,7 @@ public abstract class Actionable extends AbstractModelObject {
     /**
      * Actions contributed to this model object.
      */
-    private List<Action> actions;
+    private volatile List<Action> actions;
 
     /**
      * Gets actions contributed to this build.