netdev - Re: loosing IPMI-card by loading netconsole

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Message-ID: <1273875413.15067.1348.camel@calx>
Date:	Fri, 14 May 2010 17:16:53 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	"Ronciak, John" <john.ronciak@...el.com>,
	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>,
	Carsten Aulbert <carsten.aulbert@....mpg.de>
Subject: Re: loosing IPMI-card by loading netconsole

On Sat, 2010-05-15 at 00:11 +0200, Tejun Heo wrote:
> Hello,
> 
> On 05/14/2010 07:37 PM, Matt Mackall wrote:
> >> 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.
> > 
> > Looks like a job for bisect.
> 
> Yeap, sure, it would be effective but I kind of want to leave
> bisection as the last resort.  Bisection is a somewhat painful process
> especially when the machine isn't right next to you and someone who
> has overall knowledge can often identify the problem much easier with
> appropriate debugging info.

Well nothing jumps to mind in the netpoll/netconsole code and I haven't
heard any similar reports. My guess is it's something obscure, so I
think the sooner you start bisecting... Even one or two tests will get
us a lot closer to figuring out what changed in the last 1.5 years.

-- 
Mathematics is the supreme nostalgia of our time.


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