netdev - Re: panics in tcp

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Message-ID: <1370275097.24311.158.camel@edumazet-glaptop>
Date:	Mon, 03 Jun 2013 08:58:17 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: panics in tcp_ack

On Mon, 2013-06-03 at 10:51 -0500, Rob Herring wrote:

> Any ideas on what could cause that? Anything the driver could be doing
> or not doing to cause it? Perhaps some memory ordering or visibility issue.
> 

Yes, maybe, but I have no idea.

> > Your best bet would be to perform a (reverse) bisection if you know
> > recent kernels are OK.
> 
> I did that once looking at 3.6 and 3.7 stable kernels, but they did not
> have fixes like "tcp: fix skb_availroom()" and so I just hit other
> failures. I'll do it again with more fixes applied.

Yes, you'll have to apply a number of known fixes at every step of the
bisection, sorry !



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