Stopping corosync causes corosync-notifyd to exit and restart, restarting corosync in the process

Issue

• corosync is still running after executing pcs cluster stop.
• The pcs cluster stop or systemctl stop corosync command causes corosync-notifyd.service to exit and restart, which causes corosync.service to start again in the process.
• A node rejoins the cluster membership immediately after the cluster was stopped on that node.

# Node 1
Aug 28 07:34:20 fastvm-rhel-7-6-21 systemd: Stopping Corosync Cluster Engine...
Aug 28 07:34:20 fastvm-rhel-7-6-21 corosync[31264]: [MAIN  ] Node was shut down by a signal
Aug 28 07:34:20 fastvm-rhel-7-6-21 corosync: Signaling Corosync Cluster Engine (corosync) to terminate: [  OK  ]
Aug 28 07:34:20 fastvm-rhel-7-6-21 corosync[31264]: [SERV  ] Unloading all Corosync service engines.
...
Aug 28 07:34:20 fastvm-rhel-7-6-21 corosync[31264]: [MAIN  ] Corosync Cluster Engine exiting normally
Aug 28 07:34:20 fastvm-rhel-7-6-21 systemd: corosync-notifyd.service: main process exited, code=exited, status=1/FAILURE
Aug 28 07:34:20 fastvm-rhel-7-6-21 systemd: Unit corosync-notifyd.service entered failed state.
Aug 28 07:34:20 fastvm-rhel-7-6-21 systemd: corosync-notifyd.service failed.
Aug 28 07:34:20 fastvm-rhel-7-6-21 systemd: corosync-notifyd.service holdoff time over, scheduling restart.
Aug 28 07:34:20 fastvm-rhel-7-6-21 systemd: Stopped Corosync Dbus and snmp notifier.
Aug 28 07:34:21 fastvm-rhel-7-6-21 corosync: Waiting for corosync services to unload:.[  OK  ]
Aug 28 07:34:21 fastvm-rhel-7-6-21 systemd: Stopped Corosync Cluster Engine.
Aug 28 07:34:21 fastvm-rhel-7-6-21 systemd: Started Corosync Dbus and snmp notifier.
Aug 28 07:34:21 fastvm-rhel-7-6-21 notifyd[31314]: [error] Failed to initialize the cmap API. Error 2
Aug 28 07:34:21 fastvm-rhel-7-6-21 systemd: corosync-notifyd.service: main process exited, code=exited, status=1/FAILURE
Aug 28 07:34:21 fastvm-rhel-7-6-21 systemd: Unit corosync-notifyd.service entered failed state.
Aug 28 07:34:21 fastvm-rhel-7-6-21 systemd: corosync-notifyd.service failed.
Aug 28 07:34:21 fastvm-rhel-7-6-21 systemd: corosync-notifyd.service holdoff time over, scheduling restart.
Aug 28 07:34:21 fastvm-rhel-7-6-21 systemd: Stopped Corosync Dbus and snmp notifier.
Aug 28 07:34:21 fastvm-rhel-7-6-21 systemd: Starting Corosync Cluster Engine...

# Node 2
Aug 27 22:34:20 fastvm-rhel-7-6-22 corosync[3767]: [TOTEM ] A new membership (192.168.22.22:240167) was formed. Members left: 1
Aug 27 22:34:20 fastvm-rhel-7-6-22 corosync[3767]: [CPG   ] downlist left_list: 1 received
Aug 27 22:34:20 fastvm-rhel-7-6-22 corosync[3767]: [QUORUM] Members[1]: 2
Aug 27 22:34:20 fastvm-rhel-7-6-22 corosync[3767]: [MAIN  ] Completed service synchronization, ready to provide service.
...
Aug 27 22:34:22 fastvm-rhel-7-6-22 corosync[3767]: [TOTEM ] A new membership (192.168.22.21:240172) was formed. Members joined: 1
Aug 27 22:34:22 fastvm-rhel-7-6-22 corosync[3767]: [CPG   ] downlist left_list: 0 received
Aug 27 22:34:22 fastvm-rhel-7-6-22 corosync[3767]: [CPG   ] downlist left_list: 0 received
Aug 27 22:34:22 fastvm-rhel-7-6-22 corosync[3767]: [QUORUM] Members[2]: 1 2
Aug 27 22:34:22 fastvm-rhel-7-6-22 corosync[3767]: [MAIN  ] Completed service synchronization, ready to provide service.