[JENKINS-22681] Additional logging useful for diagnosing certain lazy-loading bugs.

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

@@ -282,6 +282,7 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
     protected Run(JobT job) throws IOException {
         this(job, new GregorianCalendar());
         this.number = project.assignBuildNumber();
+        LOGGER.log(FINE, "new {0} @{1}", new Object[] {this, hashCode()});
     }
 
     /**
@@ -315,9 +316,16 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
      */
     public void reload() throws IOException {
         this.state = State.COMPLETED;
+        // TODO ABORTED would perhaps make more sense than FAILURE:
         this.result = Result.FAILURE;  // defensive measure. value should be overwritten by unmarshal, but just in case the saved data is inconsistent
         getDataFile().unmarshal(this); // load the rest of the data
 
+        if (state == State.COMPLETED) {
+            LOGGER.log(FINE, "reload {0} @{1}", new Object[] {this, hashCode()});
+        } else {
+            LOGGER.log(WARNING, "reload {0} @{1} with anomalous state {2}", new Object[] {this, hashCode(), state});
+        }
+
         // not calling onLoad upon reload. partly because we don't want to call that from Run constructor,
         // and partly because some existing use of onLoad isn't assuming that it can be invoked multiple times.
     }
@@ -1739,6 +1747,7 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
                 // will now see this build as completed.
                 // things like triggering other builds requires this as pre-condition.
                 // see issue #980.
+                LOGGER.log(FINE, "moving into POST_PRODUCTION on {0}", this);
                 state = State.POST_PRODUCTION;
 
                 if (listener != null) {
@@ -1834,6 +1843,7 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
      * Called when a job started building.
      */
     protected void onStartBuilding() {
+        LOGGER.log(FINE, "moving to BUILDING on {0}", this);
         state = State.BUILDING;
         startTime = System.currentTimeMillis();
         if (runner!=null)
@@ -1845,14 +1855,13 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
      */
     protected void onEndBuilding() {
         // signal that we've finished building.
+        state = State.COMPLETED;
+        LOGGER.log(FINE, "moving to COMPLETED on {0}", this);
         if (runner!=null) {
             // MavenBuilds may be created without their corresponding runners.
-            state = State.COMPLETED;
             runner.checkpoints.allDone();
             runner = null;
             RunnerStack.INSTANCE.pop();
-        } else {
-            state = State.COMPLETED;
         }
         if (result == null) {
             result = Result.FAILURE;