netdev - Re: kernel warning in tcp

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Date:	Mon, 14 Sep 2015 11:12:02 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	Grant Zhang <gzhang@...tly.com>
CC:	Jovi Zhangwei <jovi@...udflare.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	FB Kernel Team <kernel-team@...com>
Subject: Re: kernel warning in tcp_fragment

Hi Grant,

Thanks for testing it.  I will try to repost the patch.

Thanks,
Martin

On Tue, Sep 01, 2015 at 04:02:33PM -0700, Grant Zhang wrote:
> Hi Martin,
>
> I did try out your v2 patch on our production server and can confirm that
> the patch gets rid of the WARN_ON trace.
>
> I would really like to see the issue been fixed by upstream(and backported
> to kernel longterm tree 3.14)--either by this patch or something else. Is
> there a plan for this?
>
> Thanks,
>
> Grant
>
> On 12/08/2015 20:45, Martin KaFai Lau wrote:
> >On Mon, Aug 10, 2015 at 02:35:37PM -0400, Neal Cardwell wrote:
> >>On Mon, Aug 10, 2015 at 2:10 PM, Jovi Zhangwei <jovi@...udflare.com> wrote:
> >>>
> >>>Ping?
> >>>
> >>>We saw a lot of this warnings in our production system. It would be
> >>>great appreciate if someone can give us the fix on this warnings. :)
> >>
> >>What is your net.ipv4.tcp_mtu_probing setting? If 1, have you tried
> >>setting it to 0?
> >
> >Hi Jovi, If setting net.ipv4.tcp_mtu_probing=0 helps, can you give the
> >patch we posted earlier a try: https://urldefense.proofpoint.com/v1/url?u=https://patchwork.ozlabs.org/patch/481609/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=%2Faj1ZOQObwbmtLwlDw3XzQ%3D%3D%0A&m=wYNHn6ACXUwYfYQpS2rAg%2BLrj8CrcyDTTr3Fx5SFoWg%3D%0A&s=51041d4fd18fa1568b4b46b683640d8239be657c50af324621ba9a4e8c9a96b6
> >It is the same patch that I pointed out earlier. You can click
> >on the download link.
> >
> >We are currently using a similar patch while keeping net.ipv4.tcp_mtu_probing=1.
> >
> >Thanks,
> >--Martin
> >--
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