Date: Fri, 18 Mar 2011 09:30:20 GMT From: Andrey Smagin <sam@dipinteractive.com> To: freebsd-net@FreeBSD.org Subject: Re: kern/155585: [tcp] [panic] tcp_output tcp_mtudisc loop until kernel panic Message-ID: <201103180930.p2I9UKtq024021@freefall.freebsd.org>
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The following reply was made to PR kern/155585; it has been noted by GNATS.
From: Andrey Smagin <sam@dipinteractive.com>
To: bug-followup@FreeBSD.org, samspeed@mail.ru
Cc:
Subject: Re: kern/155585: [tcp] [panic] tcp_output tcp_mtudisc loop until
kernel panic
Date: Fri, 18 Mar 2011 12:08:24 +0300
this patch solve my problem
Index: sys/netinet/tcp_var.h
===================================================================
--- sys/netinet/tcp_var.h (revision 219727)
+++ sys/netinet/tcp_var.h (working copy)
@@ -239,6 +239,7 @@
#define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
#define TF_CONGRECOVERY 0x20000000 /* congestion recovery
mode */
#define TF_WASCRECOVERY 0x40000000 /* was in congestion
recovery */
+#define TF_WASMTUDISC 0x80000000 /* was in mtudiscovery */
#define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
#define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
Index: sys/netinet/tcp_output.c
===================================================================
--- sys/netinet/tcp_output.c (revision 219727)
+++ sys/netinet/tcp_output.c (working copy)
@@ -1288,8 +1288,15 @@
*/
if (tso)
tp->t_flags &= ~TF_TSO;
+
+ if ( tp->t_flags & TF_WASMTUDISC ) // if
EMSGSIZE after call tcp_mtudisc then return EHOSTUNREACH
+ return (EHOSTUNREACH);
+
+ tp->t_flags |= TF_WASMTUDISC
tcp_mtudisc(tp->t_inpcb, 0);
+ tp->t_flags &= ~TF_WASMTUDISC;
return (0);
+
case EHOSTDOWN:
case EHOSTUNREACH:
case ENETDOWN:
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