reproduce (this is a W=1 build):
        # https://github.com/paulmckrcu/linux/commit/5a4379a0d448c61c5baf670bcc7f9041bc243b02
        git remote add paulmckrcu https://github.com/paulmckrcu/linux
        git fetch --no-tags paulmckrcu dev
        git checkout 5a4379a0d448c61c5baf670bcc7f9041bc243b02
        # 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