Cannot call setResult during finalization phase.

From a random failure of BuildTriggerTest.testMavenBuildTrigger:
java.lang.AssertionError
	at hudson.model.Run.setResult(Run.java:425)
	at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:722)
	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.cleanUp(MavenModuleSetBuild.java:1054)
	at hudson.model.Run.execute(Run.java:1733)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:519)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:231)

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

@@ -719,7 +719,9 @@ public abstract class AbstractBuild<P extends AbstractProject<P,R>,R extends Abs
                         String msg = "Publisher " + bs.getClass().getName() + " aborted due to exception";
                         e.printStackTrace(listener.error(msg));
                         LOGGER.log(WARNING, msg, e);
-                        setResult(Result.FAILURE);
+                        if (phase) {
+                            setResult(Result.FAILURE);
+                        }
                     }
             }
             return r;

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

@@ -422,7 +422,7 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
 
     public void setResult(Result r) {
         // state can change only when we are building
-        assert state==State.BUILDING;
+        assert state==State.BUILDING : state;
 
         // result can only get worse
         if(result==null) {