netdev - Re: Broken commit: [NETFILTER]: ipt_REJECT: remove largely duplicate route

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Date:	Tue, 28 Nov 2006 22:45:49 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Krzysztof Halasa <khc@...waw.pl>
CC:	David Miller <davem@...emloft.net>,
	lkml <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Netfilter Development Mailinglist 
	<netfilter-devel@...ts.netfilter.org>
Subject: Re: Broken commit: [NETFILTER]: ipt_REJECT: remove largely duplicate
 route_reverse function

Krzysztof Halasa wrote:
> Patrick McHardy <kaber@...sh.net> writes:
> 
>>How sure are you about this? I can see nothing wrong with that
>>commit and can't reproduce the slab corruption. Please post
>>the rule that triggers this.
> 
> 
> 99% sure. Past this commit I get corruptions after 5 minutes at most
> (that's ADSL with USB Thomson/Alcatel Speedtouch -> PPP over ATM,
> with a GRE tunnel over that PPP).

It might be the case that your network device has a
hard_header_len > LL_MAX_HEADER, which could trigger
a corruption.

> I'm now running 901eaf6c8f997f18ebc8fcbb85411c79161ab3b2 (i.e. the
> last commit before the one in question) for 4 hours and nothing like
> that.
> 
> Not sure about the exact rule, but the most probable candidates are:
> -A INPUT -p tcp --tcp-flags SYN,RST,ACK SYN -j REJECT --reject-with tcp-reset
> -A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable
> 
> Other "REJECT" rules haven't fired yet.
> 
> Could be some obscure problem with GRE/Speedtouch/PPP over ATM,
> triggered by this patch, though.
> 
> Perhaps I can do some experiments - just say a word.

Please try this patch on top of the REJECT patch (ideally after
verifying that the REJECT patch is really introducing the
corruption).


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