Hi Jessica, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 5e857ce6eae7ca21b2055cca4885545e29228fe2 commit: 93c95e526a4ef00eb3d5a1e0920ba5a22f32e40d modpost: rework and consolidate logging interface date: 3 months ago config: nios2-randconfig-c003-20200619 (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 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: "__mulsi3" [fs/cifs/cifs.ko] undefined! ERROR: modpost: "__mulsi3" [fs/nfs/nfsv4.ko] undefined! --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org