netdev - Re: __pskb_pull_tail oops from 2.6.35

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Message-Id: <20110927.161848.1967387021236457958.davem@davemloft.net>
Date:	Tue, 27 Sep 2011 16:18:48 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	davej@...hat.com
Cc:	netdev@...r.kernel.org
Subject: Re: __pskb_pull_tail oops from 2.6.35

From: Dave Jones <davej@...hat.com>
Date: Tue, 27 Sep 2011 16:15:00 -0400

> It looks like it died in put_page..
> 
> <1>[  262.574991] IP: [<ffffffff810dca57>] put_page+0x10/0x7c
> 
> which is only called in one place..
> 
> 1267         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
> 1268                 if (skb_shinfo(skb)->frags[i].size <= eat) {
> 1269                         put_page(skb_shinfo(skb)->frags[i].page);
> 1270                         eat -= skb_shinfo(skb)->frags[i].size;
> 1271                 } else {

That's a pretty serious corruption, all frag array entries from 0 to
nr_frags should have valid, non-NULL page pointers.

Maybe a LRO/GRO bug?  There were a couple of those.
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