netdev - Re: __pskb_pull_tail oops from 2.6.35

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Message-ID: <20110927202405.GB27713@redhat.com>
Date:	Tue, 27 Sep 2011 16:24:05 -0400
From:	Dave Jones <davej@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: __pskb_pull_tail oops from 2.6.35

On Tue, Sep 27, 2011 at 04:18:48PM -0400, David Miller wrote:
 > 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.

I'll see if I can talk him into trying a self-built kernel, as we're not
rebasing f14 at this point in its life-cycle. If it turns out to still affect
3.x, I'll bring it up again.

	Dave

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