[nf-next:master 9/12] undefined reference to `udp6_lib_lookup'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git master
head:   886bc50348fd69972baa4616ce95b7dc9ff8afe7
commit: 8db4c5be88f62ffd7a552f70687a10c614dc697b [9/12] netfilter: move socket lookup infrastructure to nf_socket_ipv{4,6}.c
config: i386-randconfig-x011-201645 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 8db4c5be88f62ffd7a552f70687a10c614dc697b
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   net/built-in.o: In function `nf_sk_lookup_slow_v6':
>> (.text+0x1389f8): undefined reference to `udp6_lib_lookup'

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