[JENKINS-26391] Prevent lazy loading operation when obtaining label i…

…nformation.

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

@@ -374,7 +374,7 @@ public int getTiedJobCount() {
             for (TopLevelItem topLevelItem : Jenkins.getInstance().getItemMap().values()) {
                 if (topLevelItem instanceof AbstractProject) {
                     final AbstractProject project = (AbstractProject) topLevelItem;
-                    if (this.equals(project.getAssignedLabel())) {
+                    if (this.name.equals(project.getAssignedLabelString())) {
                         result++;
                     }
                 }
@@ -389,7 +389,7 @@ public int getTiedJobCount() {
                         for (Item i : parent.getItems()) {
                             if (i instanceof AbstractProject) {
                                 final AbstractProject project = (AbstractProject) i;
-                                if (this.equals(project.getAssignedLabel())) {
+                                if (this.name.equals(project.getAssignedLabelString())) {
                                     result++;
                                 }
                             }

test/src/test/java/hudson/model/NodeTest.java

@@ -24,6 +24,7 @@
 package hudson.model;
 
 import hudson.FilePath;
+import hudson.maven.MavenModuleSet;
 import hudson.model.Node.Mode;
 import hudson.model.Queue.WaitingItem;
 import hudson.model.labels.LabelAtom;
@@ -45,13 +46,17 @@
 import java.util.Collections;
 import java.util.GregorianCalendar;
 import java.util.List;
+import java.util.concurrent.Callable;
+
 import jenkins.model.Jenkins;
 import jenkins.security.QueueItemAuthenticatorConfiguration;
 import org.acegisecurity.context.SecurityContextHolder;
 import static org.junit.Assert.*;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
+import org.jvnet.hudson.test.Issue;
+import org.jvnet.hudson.test.RunLoadCounter;
 import org.jvnet.hudson.test.JenkinsRule;
 import org.jvnet.hudson.test.MockQueueItemAuthenticator;
 import org.jvnet.hudson.test.TestExtension;
@@ -237,6 +242,26 @@ public void testToComputer() throws Exception {
         assertNull("Slave which is not added into Jenkins list nodes should not have assigned computer.", node.toComputer());
         assertNotNull("Slave which is added into Jenkins list nodes should have assigned computer.", slave.toComputer());
     }
+
+    @Issue("JENKINS-26391")
+    @Test
+    public void testGetAssignedLabelWithJobs() throws Exception {
+        final Node node = j.createOnlineSlave();
+        node.setLabelString("label1 label2");
+        MavenModuleSet mavenProject = j.createMavenProject();
+        mavenProject.setAssignedLabel(j.jenkins.getLabel("label1"));
+        RunLoadCounter.prepare(mavenProject);
+        j.assertBuildStatus(Result.FAILURE, mavenProject.scheduleBuild2(0).get());
+        Integer labelCount = RunLoadCounter.assertMaxLoads(mavenProject, 0, new Callable<Integer>() {
+            @Override
+            public Integer call() throws Exception {
+                return j.jenkins.getLabel("label1").getTiedJobCount();
+            }
+        });
+
+        assertEquals("Should have only one job tied to label.",
+                1, labelCount.intValue());
+    }
 
     @TestExtension
     public static class LabelFinderImpl extends LabelFinder{