kern/185596: in_cksum_skip: out of data by 41310

Jens Kassel Jens.Kassel at aptilo.com
Tue Jan 14 08:30:01 UTC 2014


The following reply was made to PR kern/185596; it has been noted by GNATS.

From: Jens Kassel <Jens.Kassel at aptilo.com>
To: Gleb Smirnoff <glebius at FreeBSD.org>
Cc: "freebsd-gnats-submit at FreeBSD.org" <freebsd-gnats-submit at FreeBSD.org>
Subject: RE: kern/185596: in_cksum_skip: out of data by 41310
Date: Tue, 14 Jan 2014 08:01:59 +0000

 Hi,
 
 I have not tested this on FreeBSD 10.
 
 But I found that the problem can only be reproduced when using the bce driv=
 er.=20
 Tested with both re & bge drivers and with these the problem cannot be repr=
 oduces.
 
 Checked SVN history for bce but could not find any commit that seemed to be=
  related to this issue.
 
 Regards,
 
 Jens
 
 -----Original Message-----
 From: Gleb Smirnoff [mailto:glebius at FreeBSD.org]=20
 Sent: den 9 januari 2014 11:16
 To: Jens Kassel
 Cc: freebsd-gnats-submit at FreeBSD.org
 Subject: Re: kern/185596: in_cksum_skip: out of data by 41310
 
   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-REL=
 EASE8 #0 r251259: Mon Jun  3 01:14:28 UTC 2013     root at bake.isc.freebsd.or=
 g:/usr/obj/usr/src/sys/GENERIC  i386
 J>=20
 J> We sometimes see messages like this in dmesg and /var/log/messages
 J>=20
 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>=20
 J> I have checked with tcpdump and these messages seems to be triggered whe=
 n receiving "ICMP destination unreachable" packets.
 J>=20
 J> Is this a known issue in this release?
 
 My guessing is that this messages comes off when a packet in wrong byte ord=
 er enters in_cksum().
 
 Starting with 10.0, our stack doesn't change byte order of IP packets, so i=
 f my guessing is right, the bug should vanish.
 
 We do not plan any more releases from stable/8 branch. Thus, I'd like to cl=
 ose the PR if you don't mind.
 
 --
 Totus tuus, Glebius.
 


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