netdev - Re: mvneta: oops in __rcu_read

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Message-ID: <20130918183549.3e7b8f4c@skate>
Date:	Wed, 18 Sep 2013 18:35:49 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Ethan Tuttle <ethan@...antuttle.com>
Cc:	Willy Tarreau <w@....eu>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Andrew Lunn <andrew@...n.ch>,
	Jason Cooper <jason@...edaemon.net>, netdev@...r.kernel.org,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Gregory Clément 
	<gregory.clement@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: mvneta: oops in __rcu_read_lock on mirabox

Dear Ethan Tuttle,

On Tue, 17 Sep 2013 23:30:56 -0700, Ethan Tuttle wrote:
> On Mon, Sep 16, 2013 at 11:01 PM, Willy Tarreau <w@....eu> wrote:
> > Next step should be that you test both kernels to be sure.
> 
> Thanks for the kernel images, Willy.  I'm still experimenting but
> initial results are strange: I haven't seen a crash from the -ethan
> image you provided, nor by a kernel with that config that I built
> myself.  The config is only different from my crashing config by a few
> options.  So perhaps some combination of options prevents the crash.
> I'll see if I can narrow it down.

A toolchain generating some crappy code maybe? Ethan, Willy, comparing
your toolchain (compiler version, origin of the toolchain) could be
interesting.

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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