linux-kernel - Re: netconsole not working on 2.6.17.6

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Message-Id: <200610041910.44919.bschindler@student.ethz.ch>
Date:	Wed, 4 Oct 2006 19:10:44 +0200
From:	Benjamin Schindler <bschindler@...dent.ethz.ch>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Alan Menegotto <macnish@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: netconsole not working on 2.6.17.6

On Wednesday 04 October 2006 18:05, Matt Mackall wrote:
> On Wed, Oct 04, 2006 at 01:26:54PM +0200, Benjamin Schindler wrote:
> > On Tuesday 03 October 2006 18:37, you wrote:
> > > Benjamin Schindler wrote:
> > > > Hi
> > > >
> > > > I'm unsuccesfully trying to get networking to work - I've got two
> > > > boxes
> >
> > that
> >
> > > > can ping each other: 192.168.0.101 and 192.168.0.102 - I load the
> >
> > netconsole
> >
> > > > module:
> > > >
> > > > modprobe netconsole
> > > > netconsole=6666@....168.0.102/eth0,6666@....168.0.101/00:02:44:34:5d:
> > > >f6
> > > >
> > > > In dmesg I get:
> > > >
> > > > netconsole: local port 6666
> > > > netconsole: local IP 192.168.0.102
> > > > netconsole: interface eth0
> > > > netconsole: remote port 6666
> > > > netconsole: remote IP 192.168.0.101
> > > > netconsole: remote ethernet address 00:02:44:34:5d:f6
> > > > netconsole: network logging started
> > > >
> > > > I start wireshark/tcpdump whatever - and load a few modules just to
> >
> > produce
> >
> > > > some kernel messages. However, noething leaves the wire but I get all
> > > > the messages in dmesg.
> > > >
> > > > What's wrong here?
> > > >
> > > > Thanks
> > > > Benjamin Schindler
> > > >
> > > > P.s. please cc me as I'm not subscribed to this list
> > >
> > > Are you pointing to the correct MAC? Have you tried to compile the
> > > netconsole as built-in?
> >
> > Yes, I'm pointing at the correct MAC, but since wireshark doesn't see in
> > the networl, I doubt anything actually is sent.
> > No, I have not tried to compile netconsole into the kernel because of
> > flexibility. Anyway, I have investiaged further:
> > I ran this systemtap script:
> >
> > probe module("netconsole").function("write_msg@...vers/net/netconsole.c")
> > { printf("WriteMsg called\b")
> > }
> >
> > Once this script was run, I rmmod and modprobe'd my wireless-module a few
> > times to generate some dmesg output, but according to systemtap, this
> > function never gets called.
> > So, either the call to register_console in netconsole fails, is wrong or
> > there is a but in register_console
>
> The usual problem is that the console log level is set too low.

I did 'echo 9 4 1 7 > /proc/sys/kernel/printk' and nothing changed. I also 
tried to set the log level to 9 using sysrq (dmesg confirmed), but I still 
don't get any messages
Thanks
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