reproduce (this is a W=1 build):
        # https://github.com/xinli-intel/linux-fred-public/commit/308ef9e64cf0346758ba6460c3462575ef70d04d
        git remote add xinli-intel-fred-public https://github.com/xinli-intel/linux-fred-public.git
        git fetch --no-tags xinli-intel-fred-public intel-lkp
        git checkout 308ef9e64cf0346758ba6460c3462575ef70d04d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um olddefconfig
        make W=1 O=build_dir ARCH=um SHELL=/bin/bash