Subject: Re: 2.6.20 crash in tcp_tso_segment()

From: Patrick McHardy <[email-masked]>
Date: Tue, 13 Feb 2007 15:34:43 +0100

Herbert Xu wrote:
> Mike Accetta <[email-masked]> 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.