Hi Marco, First bad commit (maybe != root cause): tree: https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/kcsan head: 144b9152791ffcd038c3b63063999b25780060d8 commit: 7c201739beef1a586d806463f1465429cdce34c5 [1/3] kcsan: Instrument memcpy/memset/memmove with newer Clang config: s390-randconfig-r011-20221204 compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 6e4cea55f0d1104408b26ac574566a0e4de48036) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://github.com/ammarfaizi2/linux-block/commit/7c201739beef1a586d806463f1465429cdce34c5 git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/kcsan git checkout 7c201739beef1a586d806463f1465429cdce34c5 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 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: "devm_ioremap_resource" [drivers/dma/qcom/hdma.ko] undefined! >> ERROR: modpost: "devm_ioremap_resource" [drivers/dma/fsl-edma.ko] undefined! -- 0-DAY CI Kernel Test Service https://01.org/lkp