Index: sys/netinet/tcp_input.c
===================================================================
--- sys/netinet/tcp_input.c
+++ sys/netinet/tcp_input.c
@@ -2563,7 +2563,8 @@
 				 */
 				if (th->th_ack != tp->snd_una ||
 				    ((tp->t_flags & TF_SACK_PERMIT) &&
-				    (to.to_flags & TOF_SACK) &&
+				    ((to.to_flags & TOF_SACK) ||
+				    (!TAILQ_EMPTY(&tp->snd_holes))) &&
 				    !sack_changed))
 					break;
 				else if (!tcp_timer_active(tp, TT_REXMT))
@@ -2576,7 +2577,8 @@
 					    IN_FASTRECOVERY(tp->t_flags)) {
 						tcp_do_prr_ack(tp, th, &to);
 					} else if ((tp->t_flags & TF_SACK_PERMIT) &&
-					    (to.to_flags & TOF_SACK) &&
+					    ((to.to_flags & TOF_SACK) ||
+					    (!TAILQ_EMPTY(&tp->snd_holes))) &&
 					    IN_FASTRECOVERY(tp->t_flags)) {
 						int awnd;
 
@@ -2650,7 +2652,8 @@
 						 * cc_cong_signal.
 						 */
 						if ((tp->t_flags & TF_SACK_PERMIT) &&
-						    (to.to_flags & TOF_SACK)) {
+						    ((to.to_flags & TOF_SACK) ||
+						    (!TAILQ_EMPTY(&tp->snd_holes)))) {
 							tp->sackhint.prr_delivered =
 							    tp->sackhint.sacked_bytes;
 						} else {
@@ -2663,7 +2666,8 @@
 						    tp->snd_nxt - tp->snd_una);
 					}
 					if ((tp->t_flags & TF_SACK_PERMIT) &&
-					    (to.to_flags & TOF_SACK)) {
+					    ((to.to_flags & TOF_SACK) ||
+					    (!TAILQ_EMPTY(&tp->snd_holes)))) {
 						TCPSTAT_INC(
 						    tcps_sack_recovery_episode);
 						tp->snd_recover = tp->snd_nxt;