D29970.diff
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	diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
	--- a/sys/netinet/tcp_input.c
	+++ b/sys/netinet/tcp_input.c
	@@ -506,6 +506,7 @@
	}
	/* XXXLAS: EXIT_RECOVERY ? */
	tp->t_bytes_acked = 0;
	+ tp->sackhint.delivered_data = 0;
	tp->sackhint.prr_out = 0;
	}

	diff --git a/sys/netinet/tcp_sack.c b/sys/netinet/tcp_sack.c
	--- a/sys/netinet/tcp_sack.c
	+++ b/sys/netinet/tcp_sack.c
	@@ -872,9 +872,11 @@
	tcp_seq highdata = tp->snd_max;
	if (tp->t_flags & TF_SENTFIN)
	highdata--;
	- if (th->th_ack != highdata)
	+ if (th->th_ack != highdata) {
	+ tp->snd_fack = th->th_ack;
	(void)tcp_sackhole_insert(tp, SEQ_MAX(th->th_ack,
	highdata - maxseg), highdata, NULL);
	+ }
	}
	(void) tp->t_fb->tfb_tcp_output(tp);
	}