diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 2f7156b8749..6b288ab10d6 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -150,6 +150,9 @@ Release 2.1.2 - UNRELEASED
     YARN-1219. FSDownload changes file suffix making FileUtil.unTar() throw
     exception. (Shanyu Zhao via cnauroth)
 
+    YARN-1251. TestDistributedShell#TestDSShell failed with timeout. (Xuan Gong
+    via hitesh)
+
 Release 2.1.1-beta - 2013-09-23
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/ApplicationMaster.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/ApplicationMaster.java
index 740a720ad00..e9a98caf57f 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/ApplicationMaster.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/ApplicationMaster.java
@@ -834,7 +834,7 @@ public class ApplicationMaster {
       // files in the distributed file-system. The tokens are otherwise also
       // useful in cases, for e.g., when one is running a "hadoop dfs" command
       // inside the distributed shell.
-      ctx.setTokens(allTokens);
+      ctx.setTokens(allTokens.duplicate());
 
       containerListener.addContainer(container.getId(), container);
       nmClientAsync.startContainerAsync(container, ctx);