tree: https://android.googlesource.com/kernel/common android-4.19-stable head: be047631defd955980ea239e1f690e1f733692fd commit: 8187202360a0cc33717ea19e15ecbab8e1e0d656 [18852/19446] UPSTREAM: net: WireGuard secure network tunnel config: arm-randconfig-r031-20201104 (attached as .config) compiler: arm-linux-gnueabi-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 git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android-4.19-stable git checkout 8187202360a0cc33717ea19e15ecbab8e1e0d656 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>): arm-linux-gnueabi-ld: lib/crypto/chacha20poly1305.o: in function `chacha_crypt': include/crypto/chacha.h:87: undefined reference to `chacha_crypt_arch' arm-linux-gnueabi-ld: include/crypto/chacha.h:87: undefined reference to `chacha_crypt_arch' arm-linux-gnueabi-ld: lib/crypto/chacha20poly1305.o: in function `chacha_init': include/crypto/chacha.h:73: undefined reference to `chacha_init_arch' arm-linux-gnueabi-ld: lib/crypto/chacha20poly1305.o: in function `hchacha_block': include/crypto/chacha.h:44: undefined reference to `hchacha_block_arch' arm-linux-gnueabi-ld: lib/crypto/chacha20poly1305.o: in function `chacha_init': include/crypto/chacha.h:73: undefined reference to `chacha_init_arch' arm-linux-gnueabi-ld: lib/crypto/chacha20poly1305.o: in function `chacha_crypt': include/crypto/chacha.h:87: undefined reference to `chacha_crypt_arch' arm-linux-gnueabi-ld: include/crypto/chacha.h:87: undefined reference to `chacha_crypt_arch' arm-linux-gnueabi-ld: lib/crypto/chacha20poly1305.o: in function `chacha_init': include/crypto/chacha.h:73: undefined reference to `chacha_init_arch' arm-linux-gnueabi-ld: lib/crypto/chacha20poly1305.o: in function `chacha_crypt': include/crypto/chacha.h:87: undefined reference to `chacha_crypt_arch' arm-linux-gnueabi-ld: include/crypto/chacha.h:87: undefined reference to `chacha_crypt_arch' arm-linux-gnueabi-ld: lib/crypto/chacha20poly1305.o: in function `chacha_init': include/crypto/chacha.h:73: undefined reference to `chacha_init_arch' arm-linux-gnueabi-ld: lib/crypto/chacha20poly1305.o: in function `chacha_crypt': include/crypto/chacha.h:87: undefined reference to `chacha_crypt_arch' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org