reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf-next.git/commit/?id=3076d3576759db157092ee7db5a9087d2ef01b00
        git remote add netfilter-nf-next git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf-next.git
        git fetch --no-tags netfilter-nf-next testing
        git checkout 3076d3576759db157092ee7db5a9087d2ef01b00
        # 1. reproduce by kismet
           # install kmax per https://github.com/paulgazz/kmax/blob/master/README.md
           kismet --linux-ksrc=linux --selectees CONFIG_IP6_NF_IPTABLES_LEGACY --selectors CONFIG_IP_NF_NAT -a=alpha
        # 2. reproduce by make
           # save the config file to linux source tree
           cd linux
           make ARCH=alpha olddefconfig