D29315.1793677378.diff
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	Index: sys/netinet/tcp_sack.c
	===================================================================
	--- sys/netinet/tcp_sack.c
	+++ sys/netinet/tcp_sack.c
	@@ -831,8 +831,18 @@
	(tp->snd_recover == tp->snd_max) &&
	TAILQ_EMPTY(&tp->snd_holes) &&
	(tp->sackhint.delivered_data > 0)) {
	- struct sackhole *hole;
	- hole = tcp_sackhole_insert(tp, SEQ_MAX(th->th_ack, tp->snd_max - maxseg), tp->snd_max, NULL);
	+ /*
	+ * Exclude FIN sequence space in
	+ * the hole for the rescue retransmission,
	+ * and also don't create a hole, if only
	+ * the ACK for a FIN is outstanding.
	+ */
	+ tcp_seq highdata = tp->snd_max;
	+ if (tp->t_flags & TF_SENTFIN)
	+ highdata--;
	+ if (th->th_ack != highdata)
	+ (void)tcp_sackhole_insert(tp, SEQ_MAX(th->th_ack,
	+ highdata - maxseg), highdata, NULL);
	}
	(void) tp->t_fb->tfb_tcp_output(tp);
	}