reproduce (this is a W=1 build):
        # https://github.com/jimc/linux/commit/027112748f47cdafe35ea0a28f410fc70d31e705
        git remote add jimc https://github.com/jimc/linux.git
        git fetch --no-tags jimc dd-shrink-6a5
        git checkout 027112748f47cdafe35ea0a28f410fc70d31e705

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash lib/