tree: https://github.com/kdave/btrfs-devel.git for-next-20210519 head: 7b1e6a22a4fd0dafc5b97a2c92fd3b13ccab2bdc commit: b4a9f4bee31449bcea678b88146c420130a7a63d [46/66] btrfs: scrub: per-device bandwidth control config: m68k-defconfig (attached as .config) compiler: m68k-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://github.com/kdave/btrfs-devel/commit/b4a9f4bee31449bcea678b88146c4... git remote add kdave-btrfs-devel https://github.com/kdave/btrfs-devel.git git fetch --no-tags kdave-btrfs-devel for-next-20210519 git checkout b4a9f4bee31449bcea678b88146c420130a7a63d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 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 >>, old ones prefixed by <<): ERROR: modpost: "__udivdi3" [fs/btrfs/btrfs.ko] undefined! --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org