linux-kernel - Re: oops in tcp_xmit_retransmit

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Message-ID: <1279195528.2496.2.camel@edumazet-laptop>
Date:	Thu, 15 Jul 2010 14:05:28 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Lennart Schulte <lennart.schulte@...s.rwth-aachen.de>
Cc:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	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>
Subject: Re: oops in tcp_xmit_retransmit_queue() w/ v2.6.32.15

Le jeudi 15 juillet 2010 à 13:58 +0200, Lennart Schulte a écrit :
> 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.

Not sure I understand. 

Are you saying you reproduce same tcp_xmit_retransmit_queue()  bug, with
a special tc qdisc/class droppping some ACK frames ?

Could it be some sched problem and incorrect return codes in case of
congestion ?


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