reproduce (this is a W=1 build):
        # https://github.com/kkdwivedi/linux/commit/3d1468dcf813bc71d425b7ce656a6877d98684e9
        git remote add kkdwivedi https://github.com/kkdwivedi/linux
        git fetch --no-tags kkdwivedi coroutine/base
        git checkout 3d1468dcf813bc71d425b7ce656a6877d98684e9

        # 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 net/core/