If I build ipv6 as a module on 2.5.69 (i386), when I try to insert it, I get this oops:
IPv6 v0.8 for NET4.0
------------[ cut here ]------------
kernel BUG at include/linux/module.h:284!
invalid operand: 0000 [#1]
CPU: 0
EIP: 0060:[<d4c79414>] Not tainted
EFLAGS: 00210246
EIP is at inet6_create+0x3b2/0x458 [ipv6]
eax: 00000000 ebx: c7c7e000 ecx: 00000001 edx: d4cae900
esi: 0000003a edi: d4cacc00 ebp: c7c7ff18 esp: c7c7fef8
ds: 007b es: 007b ss: 0068
Process modprobe (pid: 990, threadinfo=c7c7e000 task=c7b1f880)
Stack: d4cae880 c7b68c00 0000039c c13831e0 c7b68c00 00000001 0000000a ffffff9f
c7c7ff5c c0283275 c7d80e00 0000003a c7c7ff50 c7d80e00 d4cae060 cff49300
cff49300 00000003 416d0680 ce164740 d4cae0c0 d4cae880 00000000 c033cfd8
Call Trace:
[<d4cae880>] +0x0/0x200 [ipv6]
[<c0283275>] sock_create+0xeb/0x28a
[<d4cae060>] ipv6_net_table+0x0/0x60 [ipv6]
[<d4cae0c0>] ipv6_root_table+0x0/0x60 [ipv6]
[<d4cae880>] +0x0/0x200 [ipv6]
[<d4cae880>] +0x0/0x200 [ipv6]
[<d4cb1775>] icmpv6_init+0x2d/0xb4 [ipv6]
[<d4caf4c8>] __icmpv6_socket+0x0/0x4 [ipv6]
[<d4cb11b7>] inet6_init+0x141/0x314 [ipv6]
[<d4cacbe8>] inet6_family_ops+0x0/0x18 [ipv6]
[<c012ddbd>] sys_init_module+0x149/0x226
[<d4cae880>] +0x0/0x200 [ipv6]
[<c01091fb>] syscall_call+0x7/0xb
Code: 0f 0b 1c 01 8c db c9 d4 e9 b3 fd ff ff 0f 0b 1e 01 a3 db c9
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