David Ford wrote:

> Up until 2.6.9, when I changed link status after the initial 
> configuration, I would get a kernel OOPS.  Now with 2.6.9, I get a 
> crash immediately on boot with network device configuration.   
> Attached is my boot log.

Apparently SCTP corrupted the inetaddr notifier chain by registering
the same notifier_block for IPv4 and IPv6, so masq_inet_event got a
struct inet6_ifaddr instead of a struct in_ifaddr. This patch should
fix it.

Regards
Patrick

>
>
> general protection fault: 0000 [1] PREEMPT
> CPU 0
> Modules linked in: ipt_TCPMSS ipt_REJECT iptable_filter iptable_mangle 
> ipt_MASQUERADE ipt_REDIRECT ipta
> Pid: 841, comm: ip Not tainted 2.6.9
> RIP: 0010:[<ffffffffa00494a8>] 
> <ffffffffa00494a8>{:ipt_MASQUERADE:device_cmp+152}
> RSP: 0018:000001003a883c08  EFLAGS: 00010202
> RAX: 82f363feffa60e02 RBX: 0000010006260d90 RCX: ffffff000032c000
> RDX: ffffff000032cc40 RSI: 0000010006260d90 RDI: 0000010038077658
> RBP: 0000010038077658 R08: 0000000000000000 R09: 000001003ae4ea88
> R10: 0000000000000000 R11: 000001003c4aa3c0 R12: 0000000000000000
> R13: ffffffffa0049410 R14: 0000000000000000 R15: 0000000000000000
> FS:  0000002a959a6d40(0000) GS:ffffffff808f0d00(0000) 
> knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000002a9582f6d0 CR3: 0000000000101000 CR4: 00000000000006e0
> Process ip (pid: 841, threadinfo 000001003a882000, task 0000010037864cf0)
> Stack: 0000010038077820 000001003a883c34 0000010006260d90 
> ffffffffa002e7ef
>       0000000000000001 000000c4805da6c9 ffffffffa004a400 0000010006260d90
>       0000000000000001 000001003ae2a4d8
> Call Trace:<ffffffffa002e7ef>{:ip_conntrack:ip_ct_selective_cleanup+271}
>       <ffffffffa0049559>{:ipt_MASQUERADE:masq_inet_event+25}
>       <ffffffff801535f0>{notifier_call_chain+32} 
> <ffffffff8058af01>{ipv6_add_addr+1361}
>       <ffffffff8058e466>{addrconf_add_linklocal+22} 
> <ffffffff8059226f>{addrconf_notify+2383}
>       <ffffffff80530cf5>{rt_cache_flush+581} 
> <ffffffff801535f0>{notifier_call_chain+32}
>       <ffffffff804fc36c>{dev_open+124} 
> <ffffffff804fde18>{dev_change_flags+104}
>       <ffffffff80562755>{devinet_ioctl+773} 
> <ffffffff80563e6c>{inet_ioctl+92}
>       <ffffffff804f1353>{sock_ioctl+867} 
> <ffffffff801b586d>{sys_ioctl+1117}
>       <ffffffff80110f4a>{system_call+126}
>
> Code: 48 8b 00 8b 40 50 39 85 98 01 00 00 75 12 8b 43 24 39 85 e0
> RIP <ffffffffa00494a8>{:ipt_MASQUERADE:device_cmp+152} RSP 
> <000001003a883c08>
> <0>Kernel panic - not syncing: Aiee, killing interrupt handler!
> <0>Rebooting in 20 seconds..cable
>