synchronizing here can cause deadlock conditions from plugins like the

keyboard shortcuts plugin that ask for all views very frequently and do
additional locking on the actual view objects

core/src/main/java/jenkins/model/Jenkins.java

@@ -1367,7 +1367,7 @@ public class Jenkins extends AbstractCIBase implements ModifiableItemGroup<TopLe
      * Gets the read-only list of all {@link View}s.
      */
     @Exported
-    public synchronized Collection<View> getViews() {
+    public Collection<View> getViews() {
         return viewGroupMixIn.getViews();
     }