apparently there's a trend building here:
2020-05-19 08:47:50 | Building gnocchi-metricd image with: sudo buildah bud --format docker --tls-verify=False --logfile /tmp/kolla-builds/8b76ad8e-b2a6-4f07-8458-3af7c4cb66d6/docker/gnocchi/gnocchi-metricd/gnocchi-metricd-build.log -t 127.0.0.1:8787/tripleotrain/centos-binary-gnocchi-metricd:f21a5de89aa9230b80577f9e9654bfc2c4f45aee_33622c19 /tException occured while running the command
2020-05-19 08:47:50 | Traceback (most recent call last):
2020-05-19 08:47:50 |   File "/home/zuul/workspace/venv_build/lib/python2.7/site-packages/tripleoclient/command.py", line 32, in run
2020-05-19 08:47:50 |     super(Command, self).run(parsed_args)
2020-05-19 08:47:50 |   File "/home/zuul/workspace/venv_build/lib/python2.7/site-packages/osc_lib/command/command.py", line 41, in run
2020-05-19 08:47:50 |     return super(Command, self).run(parsed_args)
2020-05-19 08:47:50 |   File "/home/zuul/workspace/venv_build/lib/python2.7/site-packages/cliff/command.py", line 185, in run
2020-05-19 08:47:50 |     return_code = self.take_action(parsed_args) or 0
2020-05-19 08:47:50 |   File "/home/zuul/workspace/venv_build/lib/python2.7/site-packages/tripleoclient/v1/container_image.py", line 233, in take_action
2020-05-19 08:47:50 |     bb.build_all()
2020-05-19 08:47:50 |   File "/home/zuul/workspace/venv_build/lib/python2.7/site-packages/tripleo_common/image/builder/buildah.py", line 221, in build_all
2020-05-19 08:47:50 |     self.build_all(deps.get(container))
2020-05-19 08:47:50 |   File "/home/zuul/workspace/venv_build/lib/python2.7/site-packages/tripleo_common/image/builder/buildah.py", line 215, in build_all
2020-05-19 08:47:50 |     not_done
2020-05-19 08:47:50 | SystemError: The following jobs were incomplete: set([<Future at 0x7fbb27359890 state=finished returned NoneType>, <Future at 0x7fbb27337550 state=finished raised SystemError>])
2020-05-19 08:47:50 | The following jobs were incomplete: set([<Future at 0x7fbb27359890 state=finished returned NoneType>, <Future at 0x7fbb27337550 state=finished raised SystemError>])
2020-05-19 08:47:50 | mp/kolla-builds/8b76ad8e-b2a6-4f07-8458-3af7c4cb66d6/docker/gnocchi/gnocchi-metricd
2020-05-19 08:47:50 | Building gnocchi-statsd image with: sudo buildah bud --format docker --tls-verify=False --logfile /tmp/kolla-builds/8b76ad8e-b2a6-4f07-8458-3af7c4cb66d6/docker/gnocchi/gnocchi-statsd/gnocchi-statsd-build.log -t 127.0.0.1:8787/tripleotrain/centos-binary-gnocchi-statsd:f21a5de89aa9230b80577f9e9654bfc2c4f45aee_33622c19 /tmp/kolla-builds/8b76ad8e-b2a6-4f07-8458-3af7c4cb66d6/docker/gnocchi/gnocchi-statsd
2020-05-19 08:47:50 | Building gnocchi-api image with: sudo buildah bud --format docker --tls-verify=False --logfile /tmp/kolla-builds/8b76ad8e-b2a6-4f07-8458-3af7c4cb66d6/docker/gnocchi/gnocchi-api/gnocchi-api-build.log -t 127.0.0.1:8787/tripleotrain/centos-binary-gnocchi-api:f21a5de89aa9230b80577f9e9654bfc2c4f45aee_33622c19 /tmp/kolla-builds/8b76ad8e-b2a6-4f07-8458-3af7c4cb66d6/docker/gnocchi/gnocchi-api
2020-05-19 08:47:50 | Building neutron-server-ovn image with: sudo buildah bud --format docker --tls-verify=False --logfile /tmp/kolla-builds/8b76ad8e-b2a6-4f07-8458-3af7c4cb66d6/docker/neutron/neutron-server-ovn/neutron-server-ovn-build.log -t 127.0.0.1:8787/tripleotrain/centos-binary-neutron-server-ovn:f21a5de89aa9230b80577f9e9654bfc2c4f45aee_33622c19 /tmp/kolla-builds/8b76ad8e-b2a6-4f07-8458-3af7c4cb66d6/docker/neutron/neutron-server-ovn

https://storage.bhs.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_c53/710977/4/check/tripleo-build-containers-centos-7-buildah/c535cdf/logs/build.log