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    SubjectRe: Last night Linus bk - netfilter busted?
    On Fri, 11 Mar 2005 10:51:36 -0800 David S. Miller wrote:

    > On Fri, 11 Mar 2005 15:00:56 +0100
    > Patrick McHardy <> wrote:
    > > Works fine here. You could try if reverting one of these two patches
    > > helps (second one only if its a SMP box).
    > >
    > > ChangeSet@1.2010, 2005-03-09 20:28:17-08:00,
    > > [NETFILTER]: Reduce call chain length in netfilter (take 2)
    > It's this change, I know it is, because Linus sees the same problem
    > on his workstation.
    > You wouldn't happen to be seeing this problem on a PPC box would
    > you? Since Linus's machine is a PPC machine too, that would support
    > my theory that this could be a compiler issue on that platform.
    > Damn, wait, Patrick, I think I know what's happening. The iptables
    > IPT_* verdicts are dependant upon the NF_* values, and they don't
    > cope with Bart's changes I bet. Can you figure out what the exact
    > error would be? This kind of issue would explain the looping inside
    > of ipt_do_table(), wouldn't it?

    This is not just some buggy code - that patch also breaks interfaces:

    #define IPT_RETURN (-NF_MAX_VERDICT - 1)

    And this value is visible in userspace. Therefore we cannot modify
    NF_MAX_VERDICT without breaking all existing iptables binaries.
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