tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git pending-fixes head: 1a6722b3cb3e04a5b8d462faa2e0bff6a4bdef9c commit: 9d9e937b1c8be97b424e3e11938e183fcde905c0 [290/414] ipv6/netfilter: Discard first fragment not including all headers config: xtensa-randconfig-r004-20201118 (attached as .config) compiler: xtensa-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next pending-fixes git checkout 9d9e937b1c8be97b424e3e11938e183fcde905c0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa 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 >>): xtensa-linux-ld: net/ipv6/netfilter/nf_conntrack_reasm.o: in function `ip6frag_key_hashfn': xtensa-linux-ld: net/ipv6/netfilter/nf_conntrack_reasm.o: in function `nf_ct_frag6_gather': nf_conntrack_reasm.c:(.text+0x2ca): undefined reference to `ipv6_frag_thdr_truncated' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org