It's a relative uncritical error, ip_nat_helper_register races with
ip_conntrack_helper_unregister. The attached patch should
fix it.

Best regards,
Patrick

Henrik Nordstrom wrote:

>The warning have been isolated to the nat helpers only. The conntrack 
>helpers are silent.
>
>The full trace is
>
>#0  printk (fmt=0xa2812140 "ASSERT %s:%u %s not readlocked\n") at 
>printk.c:416
>#1  0xa280efec in ip_ct_find_helper (tuple=0xa282aab4)
>    at ip_conntrack_core.c:630
>#2  0xa281dd24 in ip_nat_helper_register (me=0xa282aaa0) at 
>ip_nat_helper.c:474
>#3  0xa282a724 in init () at ip_nat_ftp.c:327
>#4  0xa0010eb3 in sys_init_module (name_user=0x807cfe8 "ip_nat_ftp", 
>    mod_user=0x80a7578) at module.c:563
>
>this is not 100% the exact same kernel so the line number differs 
>slightly, but it is the exact same error.
>
>Regards
>Henrik
>  
>