nf_nat_move_storage():
/usr/src/debug/kernel-2.6.23/linux-2.6.23.i686/net/ipv4/netfilter/nf_nat_core.c:612
      87:       f7 47 64 80 01 00 00    testl  $0x180,0x64(%edi)
      8e:       74 39                   je     c9 <nf_nat_move_storage+0x65>

line 612:
        if (!(ct->status & IPS_NAT_DONE_MASK))
                return;

ct is NULL



To reproduce, this is the Fedora iptables config file:

*nat
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to :21
COMMIT

*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -p icmp --icmp-type any -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -i eth0 -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
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