diff --git a/lib/nvme/nvme_ns_cmd.c b/lib/nvme/nvme_ns_cmd.c
index 5a694ad57..9562cf5a1 100644
--- a/lib/nvme/nvme_ns_cmd.c
+++ b/lib/nvme/nvme_ns_cmd.c
@@ -443,6 +443,8 @@ _nvme_ns_cmd_rw(struct spdk_nvme_ns *ns, struct spdk_nvme_qpair *qpair,
 
 	if (io_flags & 0xFFFF) {
 		/* The bottom 16 bits must be empty */
+		SPDK_ERRLOG("io_flags 0x%x bottom 16 bits is not empty\n",
+			    io_flags);
 		return NULL;
 	}
 
diff --git a/lib/nvme/nvme_qpair.c b/lib/nvme/nvme_qpair.c
index c092649f7..9f585798e 100644
--- a/lib/nvme/nvme_qpair.c
+++ b/lib/nvme/nvme_qpair.c
@@ -451,6 +451,8 @@ nvme_qpair_init(struct spdk_nvme_qpair *qpair, uint16_t id,
 	qpair->req_buf = spdk_zmalloc(req_size_padded * num_requests, 64, NULL,
 				      SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_SHARE);
 	if (qpair->req_buf == NULL) {
+		SPDK_ERRLOG("no memory to allocate qpair(cntlid:0x%x sqid:%d) req_buf with %d request\n",
+			    ctrlr->cntlid, qpair->id, num_requests);
 		return -ENOMEM;
 	}