linux-kernel - Re: [fixed] [patch] Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+

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Message-ID: <Pine.LNX.4.64.0806040104340.3474@wrl-59.cs.helsinki.fi>
Date:	Wed, 4 Jun 2008 01:10:03 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	David Miller <davem@...emloft.net>
cc:	mingo@...e.hu, peterz@...radead.org,
	LKML <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>, rjw@...k.pl,
	Andrew Morton <akpm@...ux-foundation.org>, johnpol@....mipt.ru,
	mcmanus@...ksong.com
Subject: Re: [fixed] [patch] Re: [bug] stuck localhost TCP connections,
 v2.6.26-rc3+

On Tue, 3 Jun 2008, David Miller wrote:

> From: "Ilpo_Järvinen" <ilpo.jarvinen@...sinki.fi>
> Date: Wed, 4 Jun 2008 01:01:25 +0300 (EEST)
> 
> > On Wed, 4 Jun 2008, Ilpo Järvinen wrote:
> > 
> > > ...I couldn't immediately find anything obviously wrong with those changes 
> > > but the patch below might be worth of a try (without the revert of 
> > > course). If it ever spits out that WARN_ON for you, we were playing with 
> > > fire too much and it's better to return on the safe side there...
> > 
> > 
> > > [PATCH] tcp DEFER_ACCEPT: see if header prediction got turned on
> > > 
> > > If header prediction is turned on under some circumstances,
> > > DA can deadlock though I have great trouble in figuring out
> > 
> > ...Nah, keepalive timer would then eventually kill it then, so no
> > deadlock seems possible through that one.
> 
> Keepalive is very long, it might still "seem" like a deadlock for
> someone without much patience :-)

Sure, but I think Ingo kept it once hang for hours, ~8h or so...
...Though I'm not sure if that qualifies as a proof of Ingo's patience 
but rather shows his willingness to help solving the matter... ;-)

-- 
 i.