diff --git a/java/com/google/gerrit/server/git/receive/ReceiveCommits.java b/java/com/google/gerrit/server/git/receive/ReceiveCommits.java
index c747533..a3b094a 100644
--- a/java/com/google/gerrit/server/git/receive/ReceiveCommits.java
+++ b/java/com/google/gerrit/server/git/receive/ReceiveCommits.java
@@ -1863,7 +1863,9 @@
 
   private static String readHEAD(Repository repo) {
     try {
-      return repo.getFullBranch();
+      String head = repo.getFullBranch();
+      logger.atFine().log("HEAD = %s", head);
+      return head;
     } catch (IOException e) {
       logger.atSevere().withCause(e).log("Cannot read HEAD symref");
       return null;
@@ -2725,10 +2727,13 @@
 
     /** prints a warning if the new PS has the same tree as the previous commit. */
     private void sameTreeWarning() throws IOException {
-      RevCommit newCommit = receivePack.getRevWalk().parseCommit(newCommitId);
+      RevWalk rw = receivePack.getRevWalk();
+      RevCommit newCommit = rw.parseCommit(newCommitId);
       RevCommit priorCommit = revisions.inverse().get(priorPatchSet);
 
       if (newCommit.getTree().equals(priorCommit.getTree())) {
+        rw.parseBody(newCommit);
+        rw.parseBody(priorCommit);
         boolean messageEq =
             Objects.equals(newCommit.getFullMessage(), priorCommit.getFullMessage());
         boolean parentsEq = parentsEqual(newCommit, priorCommit);