netdev - Re: mvneta: oops in __rcu_read

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Message-ID: <CACzLR4t2ABZdRk40VUhLtDKXX2PQiSVoQZQ4coQkNkvETnY6Rw@mail.gmail.com>
Date:	Tue, 17 Sep 2013 23:30:56 -0700
From:	Ethan Tuttle <ethan@...antuttle.com>
To:	Willy Tarreau <w@....eu>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	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 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.

For a moment I thought I found a likely culprit: all along I've been
loading my kernel in to 0x02000000 in uboot, while the stock uboot env
(and Willy) uses 0x6400000.  But I've seen at least one
__rcu_read_lock oops since switching to 0x6400000.  So I guess I can
rule that out.

Thanks,

Ethan
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