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This bug has been copied from bug #1336462 and has been proposed
to be backported to 7.2 z-stream (EUS).

Created attachment 1160643 [details]
7.2.z-bz1338667-1-cmapctl-Handle-corosync-errors-in-print_key-func

cmapctl: Handle corosync errors in print_key func

print_key handles only CS_ERR_TRY_AGAIN error. If different error is
returned, print_key loops forewer.

Solution is to handle all errors.

Signed-off-by: Jan Friesse <jfriesse>
Reviewed-by: Christine Caulfield <ccaulfie>

corosync-2.3.4-7.el7_2.3
Since Sasha tested this on 7.2 ( deploy 7.2, update to 7.3 , upgrade to 8.0) I have verified that specific code is in the new corosync package. 

root@overcloud-controller-2 rhel-7.2]# pwd
/root/corosync/rhel-7.2

-rw-r--r--.  1 root root   1131 May 25 16:05 bz1338667-1-cmapctl-Handle-corosync-errors-in-print_key-func.patch

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2016:1291