[Differential] D5872: tcp: Don't prematurely drop receiving-only connections

[sepherosa_gmail.com (Sepherosa Ziehau)]

sepherosa_gmail.com updated the summary for this revision.
sepherosa_gmail.com updated this revision to Diff 15642.

CHANGES SINCE LAST UPDATE
  https://reviews.freebsd.org/D5872?vs=14968&id=15642

REVISION DETAIL
  https://reviews.freebsd.org/D5872

AFFECTED FILES
  sys/netinet/tcp_output.c

CHANGE DETAILS
  diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c
  --- a/sys/netinet/tcp_output.c
  +++ b/sys/netinet/tcp_output.c
  @@ -1545,9 +1545,10 @@
   			tp->t_softerror = error;
   			return (error);
   		case ENOBUFS:
  -	                if (!tcp_timer_active(tp, TT_REXMT) &&
  +			if ((len > 0 || (flags & (TH_SYN | TH_FIN))) &&
  +			    !tcp_timer_active(tp, TT_REXMT) &&
   			    !tcp_timer_active(tp, TT_PERSIST))
  -	                        tcp_timer_activate(tp, TT_REXMT, tp->t_rxtcur);
  +				panic("neither rexmt nor persist timer is set");
   			tp->snd_cwnd = tp->t_maxseg;
   			return (0);
   		case EMSGSIZE:

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To: sepherosa_gmail.com, network, glebius, adrian, delphij, decui_microsoft.com, honzhan_microsoft.com, howard0su_gmail.com, freebsd-net-list, lstewart, hiren, jtl, transport
Cc: gnn, mike-karels.net, jtl
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