netdev - Re: 2.6.35 -> 2.6.36 panic when vlan and promisc with tg3

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Date:	Tue, 30 Nov 2010 09:59:44 +0100
From:	Michael Leun <lkml20101129@...ton.leun.net>
To:	Ben Greear <greearb@...delatech.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: 2.6.35 -> 2.6.36 panic when vlan and promisc with tg3

On Mon, 29 Nov 2010 16:19:06 -0800
Ben Greear <greearb@...delatech.com> wrote:

> On 11/29/2010 11:17 AM, Michael Leun wrote:
> > UG: unable to handle kernel paging request at 01cc921c
> > IP: [<c034bfce>] vlan_hwaccel_do_receive+0x59/0xd0
> > *pdpt = 0000000036a2a001 *pde = 0000000000000000
> > Oops: 0002 [#1] SMP
> > last sysfs
> >
> > Then machine dead.
> >
> > In 2.6.35.x this did not happen (but vlans broken - cannot see vlan
> > tags with tcpdump),
> 
> Try this patch:
> 
> http://permalink.gmane.org/gmane.linux.network/176566
> 
> It looks like this hasn't made it into stable yet?

> > To reproduce:
> >
> > ip link set eth0 up
> > vconfig add eth0 2
> > ip link set eth0 promisc on

It makes it better - it does not crash anymore on this commands - but
if you add an "tcpdump -i eth0 -n" at the end it does. So,
unfortunately no real solution.

I guess, "dropping packet no one is interested in" (as noted in the
patch) does not work very well if tcpdump is actually interested?

-- 
MfG,

Michael Leun

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