diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 3a74dbf0ed92..7888efc153be 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -1282,6 +1282,9 @@ mdnblocks(SMgrRelation reln, ForkNumber forknum)
  * functions for this relation or handled interrupts in between.  This makes
  * sure we have opened all active segments, so that truncate loop will get
  * them all!
+ *
+ * If nblocks > curnblk, the request is ignored when we are in InRecovery,
+ * otherwise, an error is raised.
  */
 void
 mdtruncate(SMgrRelation reln, ForkNumber forknum,
diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c
index 8943528fe1c9..2e45f17cd0d6 100644
--- a/src/backend/storage/smgr/smgr.c
+++ b/src/backend/storage/smgr/smgr.c
@@ -870,6 +870,9 @@ smgrnblocks_cached(SMgrRelation reln, ForkNumber forknum)
  * be called in a critical section, but the current size must be checked
  * outside the critical section, and no interrupts or smgr functions relating
  * to this relation should be called in between.
+ *
+ * If the specified number of blocks is higher than the current size, the
+ * request is ignored when we are InRecovery, otherwise, an error is raised.
  */
 void
 smgrtruncate(SMgrRelation reln, ForkNumber *forknum, int nforks,
@@ -910,8 +913,15 @@ smgrtruncate(SMgrRelation reln, ForkNumber *forknum, int nforks,
 		 * backends to invalidate their copies of smgr_cached_nblocks, and
 		 * these ones too at the next command boundary. But ensure they aren't
 		 * outright wrong until then.
+		 *
+		 * nblocks > oldblocks can happen when a relation is truncated
+		 * multiple times and the restartpoint is located before the
+		 * truncates. The relation on disk will have the size of the second
+		 * truncate and when replaying the first truncate, we will have
+		 * nblocks > curnblk. We must restore old_nblocks when this happens.
 		 */
-		reln->smgr_cached_nblocks[forknum[i]] = nblocks[i];
+		reln->smgr_cached_nblocks[forknum[i]] =
+			nblocks[i] > old_nblocks[i] ? old_nblocks[i] : nblocks[i];
 	}
 }