diff --git a/iscsi-scst/kernel/isert-scst/iser_rdma.c b/iscsi-scst/kernel/isert-scst/iser_rdma.c
index 48cb109f8..2e1cf989a 100644
--- a/iscsi-scst/kernel/isert-scst/iser_rdma.c
+++ b/iscsi-scst/kernel/isert-scst/iser_rdma.c
@@ -75,6 +75,13 @@ int isert_post_recv(struct isert_connection *isert_conn,
 
 	TRACE_ENTRY();
 
+#ifdef CONFIG_SCST_EXTRACHECKS
+	if (test_bit(ISERT_DRAIN_POSTED, &isert_conn->flags)) {
+		pr_err("conn:%p post recv after drain\n", isert_conn);
+		BUG();
+	}
+#endif
+
 	err = ib_post_recv(isert_conn->qp, first_ib_wr, &bad_wr);
 	if (unlikely(err)) {
 		num_posted = isert_num_recv_posted_on_err(first_ib_wr, bad_wr);
@@ -115,6 +122,13 @@ int isert_post_send(struct isert_connection *isert_conn,
 
 	TRACE_ENTRY();
 
+#ifdef CONFIG_SCST_EXTRACHECKS
+	if (test_bit(ISERT_DRAIN_POSTED, &isert_conn->flags)) {
+		pr_err("conn:%p post send after drain\n", isert_conn);
+		BUG();
+	}
+#endif
+
 	err = ib_post_send(isert_conn->qp, first_ib_wr, &bad_wr);
 	if (unlikely(err)) {
 		num_posted = isert_num_send_posted_on_err(first_ib_wr, bad_wr);