Hi,
I'm running a public Teredo relay (IPv4-to-IPv6 migration protocol)
using Miredo. Every once in a while (a few minutes to days after
daemon restart) it becomes unusable and I see the following kernel
message:
BUG: unable to handle kernel NULL pointer dereference at virtual address
0000008c
printing eip:
c02640e6
*pde = 00000000
Oops: 0000 [#17]
SMP
Modules linked in: ip6table_filter ip6_tables af_packet tun bitrev crc32
ipt_LOG xt_tcpudp iptable_filter iptable_mangle ip_tables x_tables
dm_mod capability commoncap iTCO_wdt floppy e1000 rtc unix
CPU: 0
EIP: 0060:[<c02640e6>] Not tainted VLI
EFLAGS: 00210246 (2.6.21.3-iabg-pe750 #1)
EIP is at ip6_flush_pending_frames+0x97/0x121
eax: 00000000 ebx: d3e3ca80 ecx: db590380 edx: d3e3caf0
esi: d3e3cc80 edi: db590380 ebp: 00000002 esp: d4af7cd4
ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
Process miredo (pid: 17615, ti=d4af6000 task=cfd60030 task.ti=d4af6000)
Stack: 000005d0 00000000 d4af7d44 d4af7d54 d4af7d54 00000000 db590380
c0275ab5
00000000 00000000 00000040 00000000 00000000 d4af7d48 df4c6780
00000040
d4af7f44 d3e3ca80 3a000000 00000000 0000001c 003a0000 00000000
00000000
Call Trace:
[<c0275ab5>] rawv6_sendmsg+0x840/0xa63
[<c0258a09>] inet_sendmsg+0x3b/0x45
[<c021df73>] sock_sendmsg+0xbc/0xd4
[<c0123f99>] autoremove_wake_function+0x0/0x35
[<e087c911>] tun_chr_aio_read+0x29e/0x2a8 [tun]
[<c011025a>] default_wake_function+0x0/0xc
[<c021e29c>] sys_sendto+0x118/0x138
[<c014d03c>] do_readv_writev+0x17d/0x187
[<e087c673>] tun_chr_aio_read+0x0/0x2a8 [tun]
[<c021ef2e>] sys_socketcall+0x15e/0x242
[<c0102560>] syscall_call+0x7/0xb
=======================
Code: 8d 43 70 8b 48 04 39 c1 74 31 85 c9 74 2d ff 48 08 8b 11 8b 41 04
c7 41 04 00 00 00 00 c7 01 00 00 00 00 89 42 04 89 10 8b 41 28 <8b> b8
8c 00 00 00 85 ff 0f 85 6b ff ff ff eb 94 83 a3 84 01 00
EIP: [<c02640e6>] ip6_flush_pending_frames+0x97/0x121 SS:ESP
0068:d4af7cd4
I have not found anything related on netdev, I'll try a new kernel to be
sure. Do you need any more information to debug this issue?
Hardware is a Dell PowerEdge 750 (i386 P4 HT), vanilla kernel 2.6.21.3
running Debian testing.
Thanks,
Bernhard
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