netdev - Re: Data corruption issue with splice() on 2.6.27.10

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Message-ID: <20090107123902.GA6307@1wt.eu>
Date:	Wed, 7 Jan 2009 13:39:02 +0100
From:	Willy Tarreau <w@....eu>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Changli Gao <xiaosuo@...il.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Data corruption issue with splice() on 2.6.27.10

On Wed, Jan 07, 2009 at 12:31:53PM +0000, Jarek Poplawski wrote:
> On Wed, Jan 07, 2009 at 01:22:05PM +0100, Willy Tarreau wrote:
> > [ CCing Evgeniy and Herbert who also participate to the thread ]
> ...
> > Well, I've just tested it. It did not fix the problem but made it worse.
> ...
> 
> Terrible mistake! Here is take 2.

no problem. However, Herbert explained that this fix could not work for
multiple reasons (refcounting not fixed where the issue really is). BTW,
I've just tried it, and it crashed again, this time in tcp_send_ack().

Regards,
Willy

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