netdev - Re: mvneta: oops in __rcu_read

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Message-ID: <20130918164948.GA18754@1wt.eu>
Date:	Wed, 18 Sep 2013 18:49:48 +0200
From:	Willy Tarreau <w@....eu>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	Ethan Tuttle <ethan@...antuttle.com>,
	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

On Wed, Sep 18, 2013 at 06:35:49PM +0200, Thomas Petazzoni wrote:
> 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.

I thought about this but it looks suspicious, I don't see why the toolchain
would produce random bitflips.

My toolchain is a linaro 4.7 gcc into which I have added support for a
"pj4b" CPU target which is essentially the same as cortex-a9 plus support
for the IDIV instruction in thumb mode.

But I can send it to Ethan if that helps.

Willy

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