D29825.diff
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	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
	@@ -497,7 +497,7 @@
	tcp_sackhole_insert(struct tcpcb *tp, tcp_seq start, tcp_seq end,
	struct sackhole *after)
	{
	- struct sackhole *hole;
	+ struct sackhole hole, tail;

	/* Allocate a new SACK hole. */
	hole = tcp_sackhole_alloc(tp, start, end);
	@@ -508,7 +508,15 @@
	if (after != NULL)
	TAILQ_INSERT_AFTER(&tp->snd_holes, after, hole, scblink);
	else
	- TAILQ_INSERT_TAIL(&tp->snd_holes, hole, scblink);
	+ /*
	+ * With Rescue Retransmission, new holes may need to
	+ * be inserted just before the tail.
	+ */
	+ if (((tail = TAILQ_LAST_FAST(&tp->snd_holes, sackhole,
	+ scblink)) != NULL) && SEQ_LEQ(end, tail->start))
	+ TAILQ_INSERT_BEFORE(tail, hole, scblink);
	+ else
	+ TAILQ_INSERT_TAIL(&tp->snd_holes, hole, scblink);

	/* Update SACK hint. */
	if (tp->sackhint.nexthole == NULL)