reproduce (this is a W=1 build):
        git remote add pcmoore-selinux https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux.git
        git fetch pcmoore-selinux next
        git checkout pcmoore-selinux/next
        b4 shazam https://lore.kernel.org/r/tencent_0BEE86CD3878D26D402DDD6F949484E96E0A@qq.com
        # 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