reproduce (this is a W=1 build):
        # https://github.com/kkdwivedi/linux/commit/ed7104db7e0a960eaf9b230f7cc1ffdea582b4b3
        git remote add kkdwivedi https://github.com/kkdwivedi/linux
        git fetch --no-tags kkdwivedi fermata
        git checkout ed7104db7e0a960eaf9b230f7cc1ffdea582b4b3

        # 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/ipv4/