diff --git a/src/backend/storage/lmgr/predicate.c b/src/backend/storage/lmgr/predicate.c
index 1af41213b4..4f7c15978a 100644
--- a/src/backend/storage/lmgr/predicate.c
+++ b/src/backend/storage/lmgr/predicate.c
@@ -871,12 +871,16 @@ SerialAdd(TransactionId xid, SerCommitSeqNo minConflictCommitSeqNo)
 	{
 		firstZeroPage = SerialPage(tailXid);
 		isNewPage = true;
+elog(LOG, "!!!SerialAdd| xid: %d, serialControl->headPage: %d, tailXid: %d, SERIAL_ENTRIESPERPAGE: %ld, firstZeroPage: %d, targetPage: %d, isNewPage: %d",
+xid, serialControl->headPage, tailXid, SERIAL_ENTRIESPERPAGE, firstZeroPage, targetPage, isNewPage);
 	}
 	else
 	{
 		firstZeroPage = SerialNextPage(serialControl->headPage);
 		isNewPage = SerialPagePrecedesLogically(serialControl->headPage,
 												targetPage);
+elog(LOG, "!!!SerialAdd| xid: %d, serialControl->headPage: %d, firstZeroPage: %d, targetPage: %d, isNewPage: %d",
+xid, serialControl->headPage, firstZeroPage, targetPage, isNewPage);
 	}
 
 	if (!TransactionIdIsValid(serialControl->headXid)
@@ -887,6 +891,7 @@ SerialAdd(TransactionId xid, SerCommitSeqNo minConflictCommitSeqNo)
 
 	if (isNewPage)
 	{
+elog(LOG, "!!!SerialAdd: isNewPage, firstZeroPage: %d, targetPage: %d", firstZeroPage, targetPage);
 		/* Initialize intervening pages. */
 		while (firstZeroPage != targetPage)
 		{
@@ -894,6 +899,7 @@ SerialAdd(TransactionId xid, SerCommitSeqNo minConflictCommitSeqNo)
 			firstZeroPage = SerialNextPage(firstZeroPage);
 		}
 		slotno = SimpleLruZeroPage(SerialSlruCtl, targetPage);
+elog(LOG, "!!!SerialAdd: after while, slotno: %d", slotno);
 	}
 	else
 		slotno = SimpleLruReadPage(SerialSlruCtl, targetPage, true, xid);