diff --git a/[refs] b/[refs]
index b4bb672348d4..746db192c633 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3a0f9aaee02857609d79b20c809c02a8b7c39d06
+refs/heads/master: a5bd968aeb87af4a3a96ecdd78912832997e8a9d
diff --git a/trunk/drivers/md/persistent-data/dm-block-manager.c b/trunk/drivers/md/persistent-data/dm-block-manager.c
index 5ba277768d99..47b683e67a7c 100644
--- a/trunk/drivers/md/persistent-data/dm-block-manager.c
+++ b/trunk/drivers/md/persistent-data/dm-block-manager.c
@@ -428,8 +428,11 @@ static int dm_bm_validate_buffer(struct dm_block_manager *bm,
 		if (!v)
 			return 0;
 		r = v->check(v, (struct dm_block *) buf, dm_bufio_get_block_size(bm->bufio));
-		if (unlikely(r))
+		if (unlikely(r)) {
+			DMERR("%s validator check failed for block %llu", v->name,
+			      (unsigned long long) dm_bufio_get_block_number(buf));
 			return r;
+		}
 		aux->validator = v;
 	} else {
 		if (unlikely(aux->validator != v)) {