netdev - Re: atl1c issues on 3.8.2

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Message-ID: <20130315204457.21d46b89@milhouse>
Date:	Fri, 15 Mar 2013 20:44:57 +0100
From:	Michael Büsch <m@...s.ch>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	Eric Dumazet <edumazet@...gle.com>,
	linux-netdev <netdev@...r.kernel.org>,
	"David S.Miller" <davem@...emloft.net>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: atl1c issues on 3.8.2

On Fri, 15 Mar 2013 00:06:02 +0100
Eric Dumazet <eric.dumazet@...il.com> wrote:

> You could try various DEBUGing stuff, like CONFIG_DEBUG_PAGEALLOC and
> CONFIG_SLUB_DEBUG_ON

This bug is so weird, so I did some double-checking.
Just to minimize the mistakes on my side.
I compiled a kernel without the revert of the original commit
and without the skb fix you suggested.
It turns out that I am only able to reproduce the issue, if the ath9k interface is
up while testing the atl1c ethernet.
And I also double-checked that reverting the original commit fixes the issue.
No stalls with up or down ath9k then.
So that confirms my previous results.

I tried to enable pagealloc debug and slub debug on a kernel with the suggested skb
fix, but without the revert of the commit. Nothing special appeared
in the logs. I'm currently building a kernel with almost all debugging options
turned on. I will test that tomorrow.

Thanks for your help.

-- 
Michael

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