undefined reference to `nf_conntrack_untracked'

[kbuild test robot]

Hi Pablo,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8003a573560ae96540bce2a698347c6d502e2997
commit: bbde9fc1824aab58bc78c084163007dd6c03fe5b netfilter: factor out packet duplication for IPv4/IPv6
date:   4 months ago
config: x86_64-randconfig-s3-11292003 (attached as .config)
reproduce:
        git checkout bbde9fc1824aab58bc78c084163007dd6c03fe5b
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   net/built-in.o: In function `nf_dup_ipv4':
>> (.text+0x124cf4): undefined reference to `nf_conntrack_untracked'
   net/built-in.o: In function `nf_dup_ipv4':
   (.text+0x124d0d): undefined reference to `nf_conntrack_untracked'

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