Description of problem:
Usage of abbreviated CIDR cause keepalived to segfault upon startup.  This is fixed in later releases of OpenStack but not in RHOSP 8.  Here is a quick patch designed by the customer that fixes it in RHOSP 8.

--- /usr/lib/python2.7/site-packages/neutron/api/v2/attributes.py.rpm	2016-09-23 14:02:40.000000000 +0000
+++ /usr/lib/python2.7/site-packages/neutron/api/v2/attributes.py	2017-08-01 18:03:59.864409739 +0000
@@ -318,11 +318,11 @@
 
 def _validate_subnet(data, valid_values=None):
     msg = None
     try:
         net = netaddr.IPNetwork(_validate_no_whitespace(data))
-        if '/' not in data:
+        if '/' not in data or (net.version == 4 and str(net) != data):
             msg = _("'%(data)s' isn't a recognized IP subnet cidr,"
                     " '%(cidr)s' is recommended") % {"data": data,
                                                      "cidr": net.cidr}
         else:
             return


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Create a router using abbreviated CIDR such as 10/8 or 172.16/12
2.
3.

Actual results:
keepalived will segfault but also affects non-HA routers

Expected results:
Should not segfaults the underlying services

Additional info:
This is fixed in later release of openstack.