diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 0eda98cb94..0dc242e037 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -194,6 +194,9 @@ Release 0.23.2 - UNRELEASED
     MAPREDUCE-3954. Added new envs to separate heap size for different daemons
     started via bin scripts. (Robert Joseph Evans via vinodkv)
 
+    MAPREDUCE-4025.  AM can crash if task attempt reports bogus progress value
+    (Jason Lowe via bobby)
+
   OPTIMIZATIONS
 
     MAPREDUCE-3901. Modified JobHistory records in YARN to lazily load job and
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java
index 9d29a4c55e..dcb8972ade 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java
@@ -1030,6 +1030,7 @@ private WrappedProgressSplitsBlock getProgressSplitBlock() {
   
   private void updateProgressSplits() {
     double newProgress = reportedStatus.progress;
+    newProgress = Math.max(Math.min(newProgress, 1.0D), 0.0D);
     Counters counters = reportedStatus.counters;
     if (counters == null)
       return;