reproduce (this is a W=1 build):
        # https://github.com/brauner/linux/commit/24cbf43337f46329ddda5983bc3c585174a020ee
        git remote add brauner-github https://github.com/brauner/linux.git
        git fetch --no-tags brauner-github vfs-7.2.directory.delegations
        git checkout 24cbf43337f46329ddda5983bc3c585174a020ee

        # 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 fs/