reproduce (this is a W=1 build):
        # https://github.com/isilence/linux/commit/afd4f768b9c9b770da047bc8b829c4845da1c420
        git remote add isilence https://github.com/isilence/linux
        git fetch --no-tags isilence zcrx/v10-wip
        git checkout afd4f768b9c9b770da047bc8b829c4845da1c420
        # 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/