Description of problem: Update of OSP13z12 to passed_phase2.

We have already done the update run for all roles, and during "openstack overcloud ceph-upgrade run" run we have an error:

2020-09-09 05:17:26 | 2020-09-09 09:13:29Z [qe-Cloud-0-AllNodesDeploySteps-wn7sduykql3z.WorkflowTasks_Step2_Execution]: CREATE_IN_PROGRESS  state changed
2020-09-09 05:17:26 | 2020-09-09 09:17:16Z [qe-Cloud-0-AllNodesDeploySteps-wn7sduykql3z.WorkflowTasks_Step2_Execution]: CREATE_FAILED  resources.WorkflowTasks_Step2_Execution: Failure caused by error in tasks: ceph_base_ansible_workflow
2020-09-09 05:17:26 | 
2020-09-09 05:17:26 |   ceph_base_ansible_workflow [task_ex_id=eff1eefe-0567-4d87-9270-dfbeace69f9a] -> Failure caused by error in tasks: ceph_install


Which seems to manifest itself in ansible like this ... but it feels like partial output:


 "TASK [ceph-docker-common : inspect ceph mon container] *************************"

            \\"IPv6Gateway\\": \\"\\",\
            \\"MacAddress\\": \\"\\",\
            \\"Networks\\": {\
                \\"host\\": {\
                    \\"IPAMConfig\\": null,\
                    \\"Links\\": null,\
                    \\"Aliases\\": null,\
                    \\"NetworkID\\": \\"08c91309f2cbefbdbdc567f29b0654e8f2c1ff640fedba06564e2b4cdb3e3578\\",\
                    \\"EndpointID\\": \\"75b399b7fa547e3eb6ce346c615b491da9738bf5b735286260f08ad5256f5172\\",\
                    \\"Gateway\\": \\"\\",\
                    \\"IPAddress\\": \\"\\",\
                    \\"IPPrefixLen\\": 0,\
                    \\"IPv6Gateway\\": \\"\\",\
                    \\"GlobalIPv6Address\\": \\"\\",\
                    \\"GlobalIPv6PrefixLen\\": 0,\\Heat Stack update failed.
2020-09-08 23:22:39 | Heat Stack update failed.
2020-09-08 23:22:39 | n                    \\"MacAddress\\": \\"\\"\
                }\
            }\
        }\
    }\


Does this ring a bell, and could you help evaluating the severity of the issue ?

This issue doesn't manifest in z11, z10 ...