netdev - Re: 3.5 bridging regression

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Date:	Sun, 21 Oct 2012 15:46:42 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Willy Tarreau <w@....eu>
Cc:	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Subject: Re: 3.5 bridging regression

On Sun, 2012-10-21 at 15:26 +0200, Willy Tarreau wrote:
> On Sun, Oct 21, 2012 at 01:53:33PM +0200, Eric Dumazet wrote:
> > Hello Willy
> > 
> > This is most probably the needed fix.
> 
> Good catch, as usual ! It works flawlessly here on top of 3.6.2.
> 
> > I guess David planned to send it to stable teams if not already done.
> 
> Indeed, I've not seen it there yet.
> 
> David, are you OK with sending this patch for -stable ? It fixes
> a 3.5 regression causing bridge to panic.
> 
> > commit acb600def2110b1310466c0e485c0d26299898ae
> > Author: Eric Dumazet <edumazet@...gle.com>
> > Date:   Fri Oct 5 06:23:55 2012 +0000
> > 
> >     net: remove skb recycling
> >     
> >     Over time, skb recycling infrastructure got litle interest and
> >     many bugs. Generic rx path skb allocation is now using page
> >     fragments for efficient GRO / TCP coalescing, and recyling
> >     a tx skb for rx path is not worth the pain.
> 
> Thanks and have a nice week-end !
> Willy
> 

Thanks for testing, sorry for adding a bug.

skb_recycle() was losing skb->head_frag status.

(we could have added some logic in skb_is_recycleable(), but this
function was becoming really too complex)




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