netdev - RE: loosing IPMI-card by loading netconsole

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Message-ID: <DDC57477F5D6F845A0DDCB99D3C4812D0CA63BBB78@orsmsx510.amr.corp.intel.com>
Date:	Fri, 14 May 2010 09:39:34 -0700
From:	"Ronciak, John" <john.ronciak@...el.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Henning Fehrmann <henning.fehrmann@....mpg.de>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Matt Mackall <mpm@...enic.com>,
	Carsten Aulbert <carsten.aulbert@....mpg.de>
Subject: RE: loosing IPMI-card by loading netconsole


> -----Original Message-----
> From: Tejun Heo [mailto:tj@...nel.org]
> Sent: Friday, May 14, 2010 9:27 AM
> To: Ronciak, John
> Cc: Henning Fehrmann; Kirsher, Jeffrey T; Brandeburg, Jesse; Allan,
> Bruce W; Waskiewicz Jr, Peter P; netdev@...r.kernel.org; Matt Mackall;
> Carsten Aulbert
> Subject: Re: loosing IPMI-card by loading netconsole
> 
> Hello, John.
> 
> As Henning seems offline, I'll try to fill in.
> 
> On 05/14/2010 04:51 PM, Ronciak, John wrote:
> > Sorry to hear about the problem you are having Henning.  What do you
> > mean when you say "it disappears"?
> 
> It stops responding to IPMI requests.
> 
> > Can both eth0 and eth1 ping (or be pinged)?  Do all the networking
> > devices still show up in the system when you do an 'lspci'?
> 
> Yeah, everything other than IPMI works just fine.
> 
> > What happens if you down and then up the interface you are having
> > problems with?  Does 'rmmod' do the same thing as your removal
> method?
> 
> Haven't tried these but well I think rmmoding should achieve about the
> same thing.
> 
> > Is there anything in the system logs saying anything about the
> > interfaces?
> 
> Nope.
> 
> > We have not had reports of this so this is a bit unusual.  Please let
> us know.
> >
> > Does this happen on other systems as well or just one particular
> system?
> 
> Yeah, it happens on at least several hundred machines, so not an
> isolated hardware issue at all.
> 
> To sum up.
> 
> On 2.6.27.39, netconsole + IPMI works fine.  On 2.6.32.7, as soon as
> netconsole is loaded, IPMI stops working.  Unloading netconsole doesn't
> revive IPMI but detaching the driver from the controller does.
> In both cases, usual networking works fine.
> 
> Thanks.
> 
> --
> Tejun
Thanks Tejun.

Since the networking things seem to be operational could it be that with the newer kernel the tunnels you had setup somehow no longer exist or have been disabled somehow?  When this interface is removed and setup again it gets things fixed up again?

Cheers,
John