Stein CI is failing e.g. on this backport: https://review.opendev.org/#/c/673799/
Looking at https://logs.opendev.org/99/673799/1/check/tripleo-ci-centos-7-containers-multinode/19d35f9/logs/undercloud/var/log/journal.txt.gz there is:
Aug 05 18:28:56 undercloud.localdomain systemd[1]: Starting neutron_dhcp container...
Aug 05 18:28:56 undercloud.localdomain systemd[1]: Starting rabbitmq healthcheck...
Aug 05 18:28:56 undercloud.localdomain systemd[60807]: Failed at step EXEC spawning /usr/libexec/paunch-start-podman-container: No such file or directory
Aug 05 18:28:56 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service: control process exited, code=exited status=203
Aug 05 18:28:56 undercloud.localdomain systemd[1]: Failed to start neutron_dhcp container.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Unit tripleo_neutron_dhcp.service entered failed state.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service failed.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service holdoff time over, scheduling restart.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Stopped neutron_dhcp container.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Starting neutron_dhcp container...
Aug 05 18:28:57 undercloud.localdomain systemd[60825]: Failed at step EXEC spawning /usr/libexec/paunch-start-podman-container: No such file or directory
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service: control process exited, code=exited status=203
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Failed to start neutron_dhcp container.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Unit tripleo_neutron_dhcp.service entered failed state.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service failed.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service holdoff time over, scheduling restart.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Stopped neutron_dhcp container.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Starting neutron_dhcp container...
Aug 05 18:28:57 undercloud.localdomain systemd[60839]: Failed at step EXEC spawning /usr/libexec/paunch-start-podman-container: No such file or directory
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service: control process exited, code=exited status=203
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Failed to start neutron_dhcp container.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Unit tripleo_neutron_dhcp.service entered failed state.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service failed.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service holdoff time over, scheduling restart.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Stopped neutron_dhcp container.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Starting neutron_dhcp container...
Aug 05 18:28:57 undercloud.localdomain systemd[60977]: Failed at step EXEC spawning /usr/libexec/paunch-start-podman-container: No such file or directory
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service: control process exited, code=exited status=203
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Failed to start neutron_dhcp container.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Unit tripleo_neutron_dhcp.service entered failed state.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service failed.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service holdoff time over, scheduling restart.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Stopped neutron_dhcp container.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Starting neutron_dhcp container...
Aug 05 18:28:57 undercloud.localdomain systemd[60990]: Failed at step EXEC spawning /usr/libexec/paunch-start-podman-container: No such file or directory
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service: control process exited, code=exited status=203
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Failed to start neutron_dhcp container.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: Unit tripleo_neutron_dhcp.service entered failed state.
Aug 05 18:28:57 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service failed.
Aug 05 18:28:58 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service holdoff time over, scheduling restart.
Aug 05 18:28:58 undercloud.localdomain systemd[1]: Stopped neutron_dhcp container.
Aug 05 18:28:58 undercloud.localdomain systemd[1]: start request repeated too quickly for tripleo_neutron_dhcp.service
Aug 05 18:28:58 undercloud.localdomain systemd[1]: Failed to start neutron_dhcp container.
Aug 05 18:28:58 undercloud.localdomain systemd[1]: Unit tripleo_neutron_dhcp.service entered failed state.
Aug 05 18:28:58 undercloud.localdomain systemd[1]: tripleo_neutron_dhcp.service failed.
Looks like this patch may be missing some dependency in stable/stein:
https://github.com/openstack/paunch/commit/b33aeea9728233aca852a3e132f23fca71ac42df
