netdev - Re: kernel warning in tcp

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Message-ID: <20150727231947.GC2832181@devbig242.prn2.facebook.com>
Date:	Mon, 27 Jul 2015 16:19:48 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	Jovi Zhangwei <jovi@...udflare.com>,
	Eric Dumazet <edumazet@...gle.com>
CC:	<ncardwell@...gle.com>, <netdev@...r.kernel.org>,
	<davem@...emloft.net>, <kuznet@....inr.ac.ru>, <jmorris@...ei.org>,
	<yoshfuji@...ux-ipv6.org>, <kaber@...sh.net>,
	FB Kernel Team <kernel-team@...com>
Subject: Re: kernel warning in tcp_fragment

On Wed, Jul 22, 2015 at 11:55:35AM -0700, Jovi Zhangwei wrote:
> Sorry for disturbing, our production system(3.14 and 3.18 stable
> kernel) have many tcp_fragment warnings,
> the trace is same as below one which you discussed before.
> 
> https://urldefense.proofpoint.com/v1/url?u=http://comments.gmane.org/gmane.linux.network/365658&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=%2Faj1ZOQObwbmtLwlDw3XzQ%3D%3D%0A&m=fQUME5h%2FYY3oZjXbnLC3z6TaEEcTBSCAji4PkNqFjq8%3D%0A&s=1527f3221a6f31cba9544e5ddaa20986aafe8be8c898b42c7e9ce5e68d3803d8
> 
> But I didn't found the final solution in that mail thread, do you have
> any new ideas or patches on this warning?

I think the following points to the last discussion.  We are currently using a
similar patch:
http://comments.gmane.org/gmane.linux.network/366549

Eric, any update on your findings? or you have already pushed a fix?

Thanks,
--Martin
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