linux-kernel - Re: PROBLEM: Silent data corruption when using sendfile()

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Message-ID: <20120714101321.GA26329@vault.local>
Date:	Sat, 14 Jul 2012 12:13:21 +0200
From:	Johannes Truschnigg <johannes@...schnigg.info>
To:	Willy Tarreau <w@....eu>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Hillf Danton <dhillf@...il.com>, linux-kernel@...r.kernel.org,
	Linux-Netdev <netdev@...r.kernel.org>
Subject: Re: PROBLEM: Silent data corruption when using sendfile()

On Sat, Jul 14, 2012 at 10:31:36AM +0200, Willy Tarreau wrote:
> > Please Johannes could you try latest kernel tree ?
> 
> It would be useful, especially given the amount of changes you performed
> in this area in latest version, it could be very possible that this new
> bug got fixed as a side effect !

I upgraded to 3.4.4 (identical config as the 3.4.0 build I've been running)
and what can I say - the problem really seems to have disappeared. I performed
about 3700 iterations of my previos tests over the night, and the data always
turned out to be OK, not a single byte turned out kaput!

I wish I would have tested that earlier, and spared you the noise... well,
maybe someone who runs into a similar problem in the future will have this
discovery save her/him some time and headaches and make her/him just upgrade
kernels :)

Thanks a lot for your polite and quick responses!

-- 
with best regards:
- Johannes Truschnigg ( johannes@...schnigg.info )

www:   http://johannes.truschnigg.info/
phone: +43 650 2 133337
xmpp:  johannes@...schnigg.info

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