Created https://github.com/openshift/openshift-ansible/pull/7913 to fix this

Correct PR for 3.9 is https://github.com/openshift/openshift-ansible/pull/7911

change not in latest build (v3.9.29).

No check and upgrade failed.

https://github.com/openshift/openshift-ansible/blob/openshift-ansible-3.9.29-1/roles/openshift_sanitize_inventory/tasks/main.yml

https://github.com/openshift/openshift-ansible/pull/7911
this is PR in master.

@Vadim Could you paste PR for 3.9? 
Thanks.

The bot never created one

https://github.com/openshift/openshift-ansible/pull/8341 is a proper PR for release-3.9

Fix is available in openshift-ansible-3.9.30-1

Fixed.
openshift-ansible-3.9.30-1.git.0.a91a657.el7.noarch

TASK [openshift_sanitize_inventory : At least one master is schedulable] ******************************************************************************************************************************************
task path: /usr/share/ansible/openshift-ansible/roles/openshift_sanitize_inventory/tasks/main.yml:101
fatal: [qe-wmengah37bug1-master-etcd-1.0528-vsm.qe.rhcloud.com]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "msg": "No schedulable masters found, please remove 'openshift_schedulable=False' from all of your masters.\n"
}
	to retry, use: --limit @/usr/share/ansible/openshift-ansible/playbooks/byo/openshift-cluster/upgrades/v3_9/upgrade.retry

Kernel Version: 3.10.0-693.21.1.el7.x86_64
Operating System: Red Hat Enterprise Linux Atomic Host 7.4.5

task name is misleading.
comments on PR https://github.com/openshift/openshift-ansible/pull/7911/files