Index: sys/kern/uipc_socket.c
===================================================================
--- sys/kern/uipc_socket.c	(revision 223020)
+++ sys/kern/uipc_socket.c	(working copy)
@@ -1489,17 +1489,11 @@ restart:
 	 * If we have less data than requested, block awaiting more (subject
 	 * to any timeout) if:
 	 *   1. the current count is less than the low water mark, or
-	 *   2. MSG_WAITALL is set, and it is possible to do the entire
-	 *	receive operation at once if we block (resid <= hiwat).
-	 *   3. MSG_DONTWAIT is not set
-	 * If MSG_WAITALL is set but resid is larger than the receive buffer,
-	 * we have to do the receive in sections, and thus risk returning a
-	 * short count if a timeout or signal occurs after we start.
+	 *   2. MSG_DONTWAIT is not set
 	 */
 	if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
 	    so->so_rcv.sb_cc < uio->uio_resid) &&
-	    (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
-	    ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
+	    so->so_rcv.sb_cc < so->so_rcv.sb_lowat &&
 	    m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) {
 		KASSERT(m != NULL || !so->so_rcv.sb_cc,
 		    ("receive: m == %p so->so_rcv.sb_cc == %u",
@@ -1693,6 +1687,8 @@ dontblock:
 				break;
 		} else if (type == MT_OOBDATA)
 			break;
+		else if (m->m_type == MT_CONTROL)
+			break;
 		else
 		    KASSERT(m->m_type == MT_DATA,
 			("m->m_type == %d", m->m_type));