tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 3cc2bd440f2171f093b3a8480a4b54d8c270ed38 commit: ae56c5a72eadc2149cc49306c4a00e4c6e970384 [12465/13205] ubsan: enable for all*config builds config: mips-randconfig-r012-20201209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 5ff35356f1af2bb92785b38c657463924d9ec386) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=ae56c5a72eadc2149cc49306c4a00e4c6e970384 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout ae56c5a72eadc2149cc49306c4a00e4c6e970384 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Note: the linux-next/master HEAD 3cc2bd440f2171f093b3a8480a4b54d8c270ed38 builds fine. It may have been fixed somewhere. All errors (new ones prefixed by >>): >> ld.lld: error: undefined symbol: __compiletime_assert_323 >>> referenced by mremap.c >>> mremap.o:(get_extent) in archive mm/built-in.a --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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