reproduce (this is a W=1 build):
        # https://github.com/alexshi/linux/commit/897ed5bd9fb059d29348b23ed4ccfeb790fe503c
        git remote add alexshi https://github.com/alexshi/linux.git
        git fetch --no-tags alexshi master
        git checkout 897ed5bd9fb059d29348b23ed4ccfeb790fe503c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/sched/