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    SubjectPROBLEM: PATCH for 2.4.23-pre4 and up hang on one system
    Date
    submitted Sat Nov  8 13:08:55 HST 2003 by Beau E. Cox <beau@beaucox.com>

    [1.] One line summary of the problem:

    Patch that fixes my problem:
    Starting with 2.4.23-pre4 my system hangs during startup and/or is
    generally unstable (see patch in [ X. ] below.)

    [2.] Full description of the problem/report:

    Origionally I had catagorized this problem with the startup sequence;
    the system always seemed to hang when squid was started before
    mysql, etc. Moving squid near the end of the startup process, I
    thought the problem was in hand. However, the system (pre9) proved
    unstable (would not stay up for longer than one day.)

    The problem exhibits itself with a solid 'hang'; no oops, no dumps,
    nada.

    [ 3. ] - [ 7. ]

    See previous posting; no hardware or configuration changes.

    [X.] Other notes, patches, fixes, workarounds:

    This patch to net/ipv4/netfilter/ip_nat_core.c fixed my problem
    in all 2.4.23 versions pre4 - pre9:

    --- linux-2.4.23-pre4/net/ipv4/netfilter/ip_nat_core.c 2003-11-08
    03:01:59.000000000 -1000
    +++ linux-2.4.23-pre3/net/ipv4/netfilter/ip_nat_core.c 2003-11-08
    03:00:47.000000000 -1000
    @@ -157,8 +157,8 @@
    continue;
    }

    - if (!(mr->range[i].flags & IP_NAT_RANGE_PROTO_SPECIFIED)
    - || proto->in_range(&newtuple, IP_NAT_MANIP_SRC,
    + if ((mr->range[i].flags & IP_NAT_RANGE_PROTO_SPECIFIED)
    + && proto->in_range(&newtuple, IP_NAT_MANIP_SRC,
    &mr->range[i].min, &mr->range[i].max))
    return 1;
    }
    It is simply a rollback of changes to ip_nat_core.c made in
    pre4.

    Since my patch is to ip_nat_core.c, I should mention that I use
    NAT via iptables. Here is an the relevant section if my iptables
    startup script:

    [...]
    # setup nat
    echo " applying nat rules"
    echo ""
    $iptables -F FORWARD
    $iptables -F -t nat
    $iptables -P FORWARD DROP
    $iptables -A FORWARD -i eth0 -j ACCEPT
    $iptables -A INPUT -i eth0 -j ACCEPT
    $iptables -A OUTPUT -o eth0 -j ACCEPT
    $iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
    $iptables -t nat -A POSTROUTING -s 10.0.0.0/8 -o eth1 -j SNAT --to-source
    x.x.x.x
    [...]

    All the information I can think of relating to this problem is at:

    ftp://beaucox.com/pub/kernel/2.4.23-pre4-bug

    Please see the README file.

    ---------------------------WARNING--------------------------
    I am NOT a kernel programmer. The patch above was arrived at
    by hit-or-miss. I REALLY don't know what I am doing (but
    my system works now!)
    ---------------------------WARNING--------------------------
    Aloha => Beau;

    PS: Please let me know if you need more information.



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