netdev - Re: tcp crash in net-2.6 tree

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Date:	Fri, 30 Mar 2007 15:15:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tgraf@...g.ch
Cc:	ilpo.jarvinen@...sinki.fi, akpm@...ux-foundation.org,
	netdev@...r.kernel.org
Subject: Re: tcp crash in net-2.6 tree

From: Thomas Graf <tgraf@...g.ch>
Date: Sat, 31 Mar 2007 00:10:54 +0200

> * David Miller <davem@...emloft.net> 2007-03-30 14:43
> > Let's not speculate, let's find out for sure if snd_una is
> > surpassing high_seq while we're in this state.
> > 
> > Andrew please give this debugging patch a spin, and also what
> > is your workload?  I'd like to play with it too.
> > 
> > I've tried to code this patch so that if the bug triggers your
> > machine shouldn't crash and burn completely, just spit out the
> > log message.
> 
> I'm running into the same bug as Andew, i was able to reproduce
> using Dave's patch within minutes:
> 
> TCP BUG: high_seq==NULL [c3c9cc54] q[c3c94edc] t[c3c9cc54]
> 
> The after(snd_una, high_seq) check is not triggered.

So tp->high_seq points to the tail packet end sequence.

Ilpo does this clear things up?
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