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From: Gleb Smirnoff <glebius@FreeBSD.org>
Subject: Re: kern/185596: in_cksum_skip: out of data by 41310
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The following reply was made to PR kern/185596; it has been noted by GNATS.

From: Gleb Smirnoff <glebius@FreeBSD.org>
To: Jens Kassel <jens.kassel@aptilo.com>
Cc: freebsd-gnats-submit@FreeBSD.org
Subject: Re: kern/185596: in_cksum_skip: out of data by 41310
Date: Thu, 9 Jan 2014 14:16:06 +0400

   Jens,
 
 On Thu, Jan 09, 2014 at 06:26:14AM +0000, Jens Kassel wrote:
 J> >Originator:     Jens Kassel
 J> >Release:        8.4
 J> Aptilo Networks
 J> >Environment:
 J> FreeBSD orbytebuild-freebsd84.sth.aptilo.com 8.4-RELEASE FreeBSD 8.4-RELEASE8 #0 r251259: Mon Jun  3 01:14:28 UTC 2013     root@bake.isc.freebsd.org:/usr/obj/usr/src/sys/GENERIC  i386
 J> 
 J> We sometimes see messages like this in dmesg and /var/log/messages
 J> 
 J> in_cksum_skip: out of data by 15810
 J> in_cksum_skip: out of data by 15810
 J> in_cksum_skip: out of data by 15810
 J> in_cksum_skip: out of data by 15810
 J> in_cksum_skip: out of data by 41310
 J> 
 J> I have checked with tcpdump and these messages seems to be triggered when receiving "ICMP destination unreachable" packets.
 J> 
 J> Is this a known issue in this release?
 
 My guessing is that this messages comes off when a packet in wrong byte order
 enters in_cksum().
 
 Starting with 10.0, our stack doesn't change byte order of IP packets, so
 if my guessing is right, the bug should vanish.
 
 We do not plan any more releases from stable/8 branch. Thus, I'd like
 to close the PR if you don't mind.
 
 -- 
 Totus tuus, Glebius.