https://bugzilla.samba.org/show_bug.cgi?id=12525#c1

--- cleanup.c.orig	2017-01-18 14:53:35.000000000 +0100
+++ cleanup.c	2017-01-18 14:56:58.000000000 +0100
@@ -255,7 +255,7 @@
 				}
 				if (!am_sender)
 					io_flush(MSG_FLUSH); /* Be sure to send all messages */
-				noop_io_until_death();
+				/* noop_io_until_death(); */
 			}
 			else if (!am_sender)
 				io_flush(MSG_FLUSH); /* Be sure to send all messages */