reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor.git/commit/?id=17b5758bf35c7a113363cd7a350b7e6a251b80f4
        git remote add jj-apparmor https://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor.git
        git fetch --no-tags jj-apparmor apparmor-next
        git checkout 17b5758bf35c7a113363cd7a350b7e6a251b80f4

        # 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