diff --git a/head/sys/netinet/tcp_output.c b/head/sys/netinet/tcp_output.c
--- a/head/sys/netinet/tcp_output.c
+++ b/head/sys/netinet/tcp_output.c
@@ -130,6 +130,16 @@
&VNET_NAME(tcp_autosndbuf_max), 0,
"Max size of automatic send buffer");
+/*
+ * Make sure that either retransmit or persist timer is set for SYN, FIN and
+ * non-ACK.
+ */
+#define TCP_XMIT_TIMER_ASSERT(tp, len, th_flags) \
+ KASSERT(((len) == 0 && ((th_flags) & (TH_SYN | TH_FIN)) == 0) ||\
+ tcp_timer_active((tp), TT_REXMT) || \
+ tcp_timer_active((tp), TT_PERSIST), \
+ ("neither rexmt nor persist timer is set"))
+
static void inline hhook_run_tcp_est_out(struct tcpcb *tp,
struct tcphdr *th, struct tcpopt *to,
long len, int tso);
@@ -1545,9 +1555,7 @@
tp->t_softerror = error;
return (error);
case ENOBUFS:
- if (!tcp_timer_active(tp, TT_REXMT) &&
- !tcp_timer_active(tp, TT_PERSIST))
- tcp_timer_activate(tp, TT_REXMT, tp->t_rxtcur);
+ TCP_XMIT_TIMER_ASSERT(tp, len, flags);
tp->snd_cwnd = tp->t_maxseg;
return (0);
case EMSGSIZE:
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