Hi Masahiro, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.15.y head: 6aa11edb70c6d33fb1489ad23b4702f7493ac26a commit: a2cafe242874338c4d9d2a23fb9130c9ae4221d0 [8476/9999] kbuild: fix the modules order between drivers and libs config: nios2-randconfig-r003-20221018 compiler: nios2-linux-gcc (GCC) 12.1.0 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/stable/linux-stable-rc.git/commit/?id=a2cafe242874338c4d9d2a23fb9130c9ae4221d0 git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-5.15.y git checkout a2cafe242874338c4d9d2a23fb9130c9ae4221d0 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=nios2 SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All errors (new ones prefixed by >>, old ones prefixed by <<): ERROR: modpost: "__mulsi3" [lib/fonts/font.ko] undefined! ERROR: modpost: "__mulsi3" [lib/lz4/lz4hc_compress.ko] undefined! >> ERROR: modpost: "__divsi3_table" [lib/lz4/lz4_compress.ko] undefined! ERROR: modpost: "__mulsi3" [lib/lz4/lz4_compress.ko] undefined! ERROR: modpost: "__mulsi3" [lib/lzo/lzo_compress.ko] undefined! ERROR: modpost: "__mulsi3" [lib/bch.ko] undefined! ERROR: modpost: "__mulsi3" [lib/842/842_decompress.ko] undefined! ERROR: modpost: "__mulsi3" [lib/842/842_compress.ko] undefined! ERROR: modpost: "__mulsi3" [lib/test_lockup.ko] undefined! ERROR: modpost: "__mulsi3" [lib/test_rhashtable.ko] undefined! WARNING: modpost: suppressed 474 unresolved symbol warnings because there were too many) -- 0-DAY CI Kernel Test Service https://01.org/lkp