fedora 30 - building container image fails

make-rootless-conf

[mack@hyperion skunk]$ cat mk-fc30-image
#!/bin/bash
cont=$(buildah from fedora:30)
buildah run "$cont" -- dnf update -y
buildah commit "$cont" fc30b

[mack@hyperion skunk]$ buildah images
IMAGE NAME                                               IMAGE TAG            IMAGE ID             CREATED AT             SIZE
docker.io/library/fedora                                 30                   ad0d3c0bf762         Apr 3, 2019 17:20      311 MB
localhost/fc30b                                          latest               e1e8d0d135a7         Apr 23, 2019 13:35     311 MB
[mack@hyperion skunk]$ buildah ps
CONTAINER ID  BUILDER  IMAGE ID     IMAGE NAME                       CONTAINER NAME
96e3d0f750fc     *     ad0d3c0bf762 docker.io/library/fedora:30      fedora-working-container
[mack@hyperion skunk]$ buildah run 96e3d0f750fc -- bash
container_linux.go:345: starting container process caused "set process label: write /proc/self/task/1/attr/exec: invalid argument"
error running container: error creating container for [/usr/bin/bash]: : exit status 1
error while running runtime: exit status 1
ERRO[0000] exit status 1