reproduce (this is a W=1 build):
        # https://github.com/jonhunter/linux/commit/a225423b2eaee3811813f96bfe4402b667aed2bc
        git remote add jonhunter https://github.com/jonhunter/linux
        git fetch --no-tags jonhunter tegra/next-fixes
        git checkout a225423b2eaee3811813f96bfe4402b667aed2bc
        # 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 net/core/