netdev - Re: oops in tcp_xmit_retransmit

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Message-ID: <4C3EF7EA.2040900@nets.rwth-aachen.de>
Date:	Thu, 15 Jul 2010 13:58:34 +0200
From:	Lennart Schulte <lennart.schulte@...s.rwth-aachen.de>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
CC:	Tejun Heo <tj@...nel.org>, "David S. Miller" <davem@...emloft.net>,
	lkml <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Fehrmann, Henning" <henning.fehrmann@....mpg.de>,
	Carsten Aulbert <carsten.aulbert@....mpg.de>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: oops in tcp_xmit_retransmit_queue() w/ v2.6.32.15

I'm testing new reordering algorithms in a virtual testbed, that is the 
nodes are emulated with xen and all the network parameters can be tuned 
with queues.
With one of the algorithms I also got tracebacks which include 
tcp_xmit_retransmit_queue. It only happens with ACK loss. The kernel 
version however is 2.6.31.
When I read this thread I tried the debug patch and got the following:

[ 2754.413150] NULL head, pkts 0
[ 2754.413156] Errors caught so far 1

Hope that is of any help.
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