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Subject[BUG] 2.4.15 iptables/REDIRECT kernel oops

This is a repost of a previous message, with some new info: the oops is related
to iptables/REDIRECT:

iptables -t nat -I PREROUTING -p tcp --dst \
--dport 1080 -j REDIRECT --to 80 > /dev/null 2>&1
iptables -t nat -I OUTPUT -p tcp --dst \
--dport 1080 -j REDIRECT --to 80 > /dev/null 2>&1

This redirects connects to the machine itself ( port 1080 to port
80, which is where apache listens. Connecting to seems
to result in the reported oops, as reported before. It's very reproducable
here, on several machines. So enjoy!

* Both with standard iptables and iptables-1.2.4 have this problem.
* Based on a previous response I upgraded ksymoops. Didn't change the output
* Using the PREROUTING chain results in the oops. The OUTPUT chain just freezes
the system.
* It's reproducable here, so try for yourself.
* I think it's a bug


[fokkensr@iasdev fokkensr]$ ksymoops -k ksyms-2.4.15-pre8 -o /lib/modules/2.4.15-pre8-fks/ -m /boot/ oops-2.4.15-pre8.txt

ksymoops 0.7c on i686 2.4.8-clk. Options used
-V (default)
-k ksyms-2.4.15-pre8 (specified)
-l /proc/modules (default)
-o /lib/modules/2.4.15-pre8-fks/ (specified)
-m /boot/ (specified)

Error (expand_objects): cannot stat(/lib/cpqarray.o) for cpqarray
ksymoops: No such file or directory
Error (expand_objects): cannot stat(/lib/aic7xxx.o) for aic7xxx
ksymoops: No such file or directory
/usr/bin/find: /lib/modules/2.4.15-pre8-fks/build/include/sound/isapnp.h: No such file or directory
Error (pclose_local): find_objects pclose failed 0x100
Warning (compare_ksyms_lsmod): module e1000 is in lsmod but not in ksyms, probably no symbols exported
Error (compare_ksyms_lsmod): module nfsd is in ksyms but not in lsmod
Error (compare_ksyms_lsmod): module lockd is in ksyms but not in lsmod
Error (compare_ksyms_lsmod): module sunrpc is in ksyms but not in lsmod
Warning (map_ksym_to_module): cannot match loaded module cpqarray to a unique module object. Trace may not be reliable.
Oops: 0000
CPU: 0
EIP: 0010:[<c02000c5>]
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 000005dc ebx: edbea7e8 ecx: edca8800 edx: 00000000
esi: ee91c0ac edi: 00000000 ebp: ec6147a4 esp: f0d4bd84
ds: 0010 es: 0018 ss: 0018
Stack: 00000001 f0d4a000 00000003 00000000 edca8800 c01f043d edbea7e8 ec2468ac
ed63c6d4 f77f0084 ee2468c0 f0d4bdc4 c034fed8 c01fef56 00000002 00000003
edbea7e8 00000000 edca8800 c0200024 00000045 ec63c6d4 f77f0084 ee2468c0
Call Trace: <c01f043d> <c01fef56> <c0200024> <c01163cc> <c0215589>
<c020f648> <c020fc02> <c0130521> <c02106df> <c0205a2b> <c0222edc>
<c0222f16> <c01e056d> <c0222edc> <c01e078b> <c014329e> <c01076a3>
Code: 8a 87 4c 03 00 00 3c 02 74 0a 3c 01 75 0b f6 45 20 04 75 05

>>EIP; c02000c5 <ip_queue_xmit2+a1/22c> <=====
Trace; c01f043d <nf_hook_slow+19d/21c>
Trace; c01fef56 <ip_queue_xmit+28e/300>
Trace; c0200024 <ip_queue_xmit2+0/22c>
Trace; c01163cc <schedule+500/8d0>
Trace; c0215589 <tcp_v4_send_check+6d/ac>
Trace; c020f648 <tcp_cwnd_restart+18/a4>
Trace; c020fc02 <tcp_transmit_skb+52e/5ec>
Trace; c0130521 <__lock_page+91/9c>
Trace; c02106df <tcp_write_xmit+18f/2dc>
Trace; c0205a2b <tcp_sendmsg+fd7/1370>
Trace; c0222edc <inet_sendmsg+0/40>
Trace; c0222f16 <inet_sendmsg+3a/40>
Trace; c01e056d <sock_sendmsg+81/a4>
Trace; c0222edc <inet_sendmsg+0/40>
Trace; c01e078b <sock_write+a3/ac>
Trace; c014329e <sys_write+8e/c4>
Trace; c01076a3 <system_call+2f/34>

Code; c02000c5 <ip_queue_xmit2+a1/22c>
00000000 <_EIP>:
Code; c02000c5 <ip_queue_xmit2+a1/22c> <=====
0: 8a 87 4c 03 00 00 mov 0x34c(%edi),%al <=====
Code; c02000cb <ip_queue_xmit2+a7/22c>
6: 3c 02 cmp $0x2,%al
Code; c02000cd <ip_queue_xmit2+a9/22c>
8: 74 0a je 14 <_EIP+0x14> c02000d9 <ip_queue_xmit2+b5/22c>
Code; c02000cf <ip_queue_xmit2+ab/22c>
a: 3c 01 cmp $0x1,%al
Code; c02000d1 <ip_queue_xmit2+ad/22c>
c: 75 0b jne 19 <_EIP+0x19> c02000de <ip_queue_xmit2+ba/22c>
Code; c02000d3 <ip_queue_xmit2+af/22c>
e: f6 45 20 04 testb $0x4,0x20(%ebp)
Code; c02000d7 <ip_queue_xmit2+b3/22c>
12: 75 05 jne 19 <_EIP+0x19> c02000de <ip_queue_xmit2+ba/22c>

2 warnings and 6 errors issued. Results may not be reliable.

[fokkensr@iasdev fokkensr]$ rpm -q -i kernel-2.4.15-pre8-freeswan-1.91-1fks-7redhat
Name : kernel-2.4.15-pre8-freeswan-1.91 Relocations: (not relocateable)
Version : 1fks Vendor: (none)
Release : 7redhat Build Date: Wed 21 Nov 2001 02:39:43 PM CET
Install date: Wed 21 Nov 2001 03:07:58 PM CET Build Host: iasdev
Group : System Environment/Kernel Source RPM: kernel-2.4.15-pre8-freeswan-1.91-1fks-7redhat.src.rpm
Size : 26095803 License: GPL
Summary : A kernel with FreeS/WAN included
Description :
Linux kernel 2.4.15-pre8
* FreeS/WAN 1.91
* X.509 Certificate Support 0.8.5
* 3Dfx module
* Alsa 0.5.12
* QLogic Fibre Channel Driver for QLA2x00 4.25
* VLAN packet size support for 3c59x NICs
* HZ is 2048 instead of 100
* iptables 1.2.4
* lm_sensors 2.6.1
* Intel e1000 3.1.23
and more in the future.

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