reproduce (this is a W=1 build):
        # https://github.com/norov/linux/commit/7a49ab0bc5eb96c752ad339794e476c19613cb5d
        git remote add norov https://github.com/norov/linux
        git fetch --no-tags norov assert
        git checkout 7a49ab0bc5eb96c752ad339794e476c19613cb5d

        # 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 arch/x86/kernel/