tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: ab8be66e724ecf4bffb2895c9c91bbd44fa687c7 commit: 08622869ed3f167db9b2250ab1bb055f55293401 [5953/9560] ip6_vti: support IP6IP6 tunnel processing with .cb_handler config: x86_64-rhel-7.6-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce (this is a W=1 build): git checkout 08622869ed3f167db9b2250ab1bb055f55293401 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: net/ipv6/ip6_vti.o: in function `vti6_rcv_tunnel': >> net/ipv6/ip6_vti.c:1228: undefined reference to `xfrm6_tunnel_spi_lookup' Segmentation fault .btf.vmlinux.bin.o: file not recognized: file format not recognized vim +1228 net/ipv6/ip6_vti.c 1220 1221 #if IS_ENABLED(CONFIG_INET6_XFRM_TUNNEL) 1222 static int vti6_rcv_tunnel(struct sk_buff *skb) 1223 { 1224 const xfrm_address_t *saddr; 1225 __be32 spi; 1226 1227 saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr; > 1228 spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr); 1229 1230 return vti6_input_proto(skb, IPPROTO_IPV6, spi, 0); 1231 } 1232