Got this while trying to install 126.96.36.199 RAC on Redhat Linux 7.2. root.sh fails with a message like
ohasd failed to start Failed to start the Clusterware. Last 20 lines of the alert log follow: 2017-11-09 15:43:37.883: [client(37246)]CRS-2101:The OLR was formatted using version 3.
This is bug 18370031. Need to apply the patch before running root.sh.