linux-kernel - Re: [PATCH] tcp: Avoid infinite loop on recvmsg bug

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Date:	Thu, 08 Nov 2012 19:29:56 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Julius Werner <jwerner@...omium.org>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	James Morris <jmorris@...ei.org>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Dave Jones <davej@...hat.com>,
	Sameer Nanda <snanda@...omium.org>,
	Mandeep Singh Baines <msb@...omium.org>
Subject: Re: [PATCH] tcp: Avoid infinite loop on recvmsg bug

On Wed, 2012-11-07 at 18:25 -0800, Julius Werner wrote:
> > So you probably are fighting a bug we already fixed in upstream kernel.
> >
> > (commit c8628155ece363 "tcp: reduce out_of_order memory use" did not
> > played well with cloned skbs.)
> >
> > This issue was already discussed on netdev in the past.
> 
> Thanks for the hint. Unfortunately, we have not pulled c8628 into our
> tree yet, so that's not it. Is there another point where the cloned
> skb or the faked truesize might make it break? We have been running
> this test with that hardware some 30 times in the last months and only
> seen it once, so it cannot be that common.

Update : Chrome OS current tree is based on 3.4 and really needed the
patch :

https://gerrit.chromium.org/gerrit/#/c/37666/



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