Subject: Re: 2.6.17-rc4: netfilter LOG messages truncated via NETCONSOLE

From: Frank van Maarseveen <[email-masked]>
Date: Wed, 31 May 2006 18:06:11 +0200

On Wed, May 31, 2006 at 04:57:13PM +0200, Patrick McHardy wrote:
> Frank van Maarseveen wrote:
> > I have two machines named "porvoo" and "espoo". The first one
> > has netconsole configured to send kernel messages to UDP port 514
> > (a.k.a. syslog) on the other machine.
> > 
> > Somewhere between 2.6.13.2 and 2.6.17-rc4 there is a regression causing
> > the netconsole messages which originate from netfilter to be truncated
> > right after the MAC addresses. For example, /var/log/messages on the
> > sending machine says:
> > 
> > May 31 09:28:11 porvoo kernel: IN=eth0 OUT= MAC=00:12:3f:85:9f:92:00:04:9a:a0:1d:d1:08:00 SRC=192.168.100.30 DST=172.17.1.113 LEN=60 TOS=0x00 PREC=0x00 TTL=54 ID=51496 DF PROTO=TCP SPT=50868 DPT=22 WINDOW=5840 RES=0x00 SYN URGP=0 
> > 
> > but netconsole messages captured in /var/log/messages on the receiving
> > machine:
> > 
> > May 31 09:28:11 porvoo IN=eth0 OUT= 
> > May 31 09:28:11 porvoo MAC=
> > May 31 09:28:11 porvoo 00:
> > May 31 09:28:11 porvoo 12:
> > May 31 09:28:11 porvoo 3f:
> > May 31 09:28:11 porvoo 85:
> > May 31 09:28:11 porvoo 9f:
> > May 31 09:28:11 porvoo 92:
> > May 31 09:28:11 porvoo 00:
> > May 31 09:28:11 porvoo 04:
> > May 31 09:28:11 porvoo 9a:
> > May 31 09:28:11 porvoo a0:
> > May 31 09:28:11 porvoo 1d:
> > May 31 09:28:11 porvoo d1:
> > May 31 09:28:11 porvoo 08:
> > May 31 09:28:11 porvoo 00 
> > May 31 09:49:06 espoo -- MARK --
> > 
> > I ran a tcpdump on the sending machine to verify(?) what goes out but in
> > that case the 2.6.17-rc4 kernel starts to report "protocol 0000 is buggy":

[...]

> 
> 
> The message means that there was recursion and netpoll fell back
> to dev_queue_xmit This patch should fix the "protocol is buggy"
> messages, netpoll didn't set skb->nh.raw. Please try if it also
> makes the other problem go away.

"protocol 0000 is buggy" is gone. The other problem is still there.

-- 
Frank