netdev - Re: 2.6.20 crash in tcp_tso

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Message-ID: <45D1CC83.8080603@trash.net>
Date:	Tue, 13 Feb 2007 15:34:43 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Mike Accetta <maccetta@...relnetworks.com>, netdev@...r.kernel.org
Subject: Re: 2.6.20 crash in tcp_tso_segment()

Herbert Xu wrote:
> Mike Accetta <maccetta@...relnetworks.com> wrote:
> 
>>Obviously the code believes it can assume that there are always multiple
>>sk_buff's in the chain.  The stack trace seems to implicate iptables in
>>the scenario (twice) if that means anything.  Any ideas about what may
>>be going wrong here?  There is indeed a private module loaded at the time
>>but it does no networking and I doubt it is the culprit.
> 
> 
> Yeah we should never get here if we only have one segment.
> Could you get it to print out the value of skb->gso_*?

The callpath shows the REJECT target sending a TCP reset.
I'm guessing it has something to do with skb_copy_expand
copying the gso fields.

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