reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/amir73il/linux/commit/31cc229cb62d9127b8c60a33d219ea0b879a7613
        git remote add amir73il https://github.com/amir73il/linux
        git fetch --no-tags amir73il fan_pre_dir_access
        git checkout 31cc229cb62d9127b8c60a33d219ea0b879a7613
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.3.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=nios2 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.3.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=nios2 SHELL=/bin/bash fs/nfsd/