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Subject[BUG] vanilla 2.4.15 iptables/REDIRECT kernel oops
I got another kernel oops related to iptables/REDIRECT, this time it's a plain vanilla kernel 2.4.15

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!


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

ksymoops 2.4.3 on i686 2.4.8-clk. Options used
-V (default)
-k ksyms-2.4.15 (specified)
-l /proc/modules (default)
-o /lib/modules/2.4.15/ (specified)
-m /boot/ (specified)

Unable to handle kernel NULL pointer dereference at virtual address 0000034e
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<c0200cb5>] not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 000005dc ebx: f76b0ea0 ecx: f76be800 edx: 00000000
esi: f76b30ac edi: 00000000 ebp: f72ab224 esp: f7193d98
ds: 0010 es: 0018 ss: 0018
Stack: 00000001 f7192000 00000003 00000000 f76be800 c01f102d f76b0ea0 f76bc0ac
f72fa6d4 f76b0130 f76bc0c0 f7193dd8 c034bed8 c01ffb46 00000002 00000003
f76b0ea0 00000000 f76be800 c0200c14 0000003c f72fa6d4 f76b0130 f76bc0c0
Call Trace: <c01f102d> <c01ffb46> <c0200c14> <c0198c23> <c0216179>
<c0210238> <c02107f2> <c0210b23> <c020617f> <c0223acc> <c0223b06>
<c01e115d> <c0223acc> <c01e137b> <c01437ec> <c01076a3>
Code: 8a 87 4c 03 00 00 3c 02 74 0a 3c 01 75 0b f6 45 20 04 75 05
>>EIP; c0200cb4 <ip_queue_xmit2+a0/22c> <=====
Trace; c01f102c <nf_hook_slow+19c/21c>
Trace; c01ffb46 <ip_queue_xmit+28e/300>
Trace; c0200c14 <ip_queue_xmit2+0/22c>
Trace; c0198c22 <generic_unplug_device+62/b0>
Trace; c0216178 <tcp_v4_send_check+6c/ac>
Trace; c0210238 <tcp_cwnd_restart+18/a4>
Trace; c02107f2 <tcp_transmit_skb+52e/5ec>
Trace; c0210b22 <tcp_push_one+8a/114>
Trace; c020617e <tcp_sendmsg+b3a/1370>
Trace; c0223acc <inet_sendmsg+0/40>
Trace; c0223b06 <inet_sendmsg+3a/40>
Trace; c01e115c <sock_sendmsg+80/a4>
Trace; c0223acc <inet_sendmsg+0/40>
Trace; c01e137a <sock_write+a2/ac>
Trace; c01437ec <sys_write+8c/c4>
Trace; c01076a2 <system_call+2e/34>
Code; c0200cb4 <ip_queue_xmit2+a0/22c>
00000000 <_EIP>:
Code; c0200cb4 <ip_queue_xmit2+a0/22c> <=====
0: 8a 87 4c 03 00 00 mov 0x34c(%edi),%al <=====
Code; c0200cba <ip_queue_xmit2+a6/22c>
6: 3c 02 cmp $0x2,%al
Code; c0200cbc <ip_queue_xmit2+a8/22c>
8: 74 0a je 14 <_EIP+0x14> c0200cc8 <ip_queue_xmit2+b4/22c>
Code; c0200cbe <ip_queue_xmit2+aa/22c>
a: 3c 01 cmp $0x1,%al
Code; c0200cc0 <ip_queue_xmit2+ac/22c>
c: 75 0b jne 19 <_EIP+0x19> c0200ccc <ip_queue_xmit2+b8/22c>
Code; c0200cc2 <ip_queue_xmit2+ae/22c>
e: f6 45 20 04 testb $0x4,0x20(%ebp)
Code; c0200cc6 <ip_queue_xmit2+b2/22c>
12: 75 05 jne 19 <_EIP+0x19> c0200ccc <ip_queue_xmit2+b8/22c>
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