From mboxrd@z Thu Jan  1 00:00:00 1970
From: Patrick McHardy <kaber@trash.net>
Subject: ip6tables broken
Date: Tue, 15 Apr 2008 15:23:36 +0200
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To: Jan Engelhardt <jengelh@computergmbh.de>
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Using the net-2.6.26.git/latest SVN tree I get:

[96565.511804] ip6_tables: MARK target: invalid size 4 != 8
[96565.536937] ip6_tables: MARK target: invalid size 4 != 8
[96565.570762] ip6_tables: MARK target: invalid size 4 != 8

Userspace chooses revision 2, the kernel apparently revision 0.
I'm pretty certain this is some fallout from your latest patches.