diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 31da8c538480..ce6c0cbb3d7a 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -993,8 +993,10 @@ static struct bio *bio_chain_clone_range(struct bio **bio_src,
 		unsigned int bi_size;
 		struct bio *bio;
 
-		if (!bi)
+		if (!bi) {
+			rbd_warn(NULL, "bio_chain exhausted with %u left", len);
 			goto out_err;	/* EINVAL; ran out of bio's */
+		}
 		bi_size = min_t(unsigned int, bi->bi_size - off, len);
 		bio = bio_clone_range(bi, off, bi_size, gfpmask);
 		if (!bio)