netdev - Re: kernel warning in tcp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 12 Aug 2015 20:45:28 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	Jovi Zhangwei <jovi@...udflare.com>
CC:	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

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://patchwork.ozlabs.org/patch/481609/
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
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html