netdev - Re: PROBLEM: system freezes on starting ne2k-pci + bridge

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Date:	Thu, 4 Oct 2007 14:27:54 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	mirko.parthey@...ormatik.tu-chemnitz.de (Mirko Parthey)
Cc:	netdev@...r.kernel.org
Subject: Re: PROBLEM: system freezes on starting ne2k-pci + bridge

On Thu, 4 Oct 2007 20:27:38 +0200
mirko.parthey@...ormatik.tu-chemnitz.de (Mirko Parthey) wrote:

> On Tue, Oct 02, 2007 at 04:12:17PM +0200, I wrote:
> > On a machine running Debian testing, I get complete lockups
> > (Num lock LED not responding anymore)
> > 
> > Kernel versions tried (all of them show this problem):
> > - linux-image-2.6.18-5-amd64 (Debian etch)
> > - linux-image-2.6.22-2-amd64 (Debian testing)
> > - plain kernel.org 2.6.23-rc8-git4 (with allmodconfig and ATKBD=y)
> > 
> > The 2.6.18 kernel sometimes prints
> >   Losing some ticks ... checking if CPU frequency changed.
> >   Your time source seems to be instable or some driver is hogging
> >   interrupts.
> >   rip __do_softirq + 0x53/0xd5
> > before freezing.
> 
> I was able to narrow this down a bit - the problem can be reproduced with 
> the ne2k-pci driver alone, sky2 is not needed.
> Powering off isn't necessary, either.
> 
> Hardware preparation:
> - eth0: Compex ReadyLink 2000 (BNC+TP), ne2k-pci driver,
>   network cable disconnected
> 
> How to reproduce the problem:
> 
> brctl addbr br0
> brctl addif br0 eth0
> ifconfig eth0 0 up
> ifconfig br0 192.168.1.17 up
> sync
> find / >/dev/null &
> ping -b 192.168.1.255
> 
> This will lock up my system, usually within a few seconds.
> 
> Some additional information:
> - I could not reproduce the problem when using eth0 directly,
>   without a bridge.
> - Booting with "maxcpus=1" does not help, the problem remains.
>   My system doesn't boot with "nosmp", otherwise I would have
>   tried this too.
>

Yes its a bug, but the ne2k is old crufty device driver not really
suited to bridging. It lacks:
   * proper speed reporting via ethtool (not much of any ethtool support).
   * doesn't report carrier up/down status




-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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