When I tried to start the 12.1.0.2 CRS in one of the RAC nodes on Linux, seen the error "CRS-2922: The attribute 'ORACLE_USER' is not supported for resource type 'ora.gipc.type'. CRS-4000: Command Add failed, or completed with errors."
Solution:-
As root user executed the command
crsctl add res ora.gipcd -type ora.gipc.type -attr "ACL='owner:oragrid:rw-,pgrp:oinstall:rw-,other::r--,user:oragrid:rwx'" -init
Here oragrid is the grid user and oinstall is the group.
Now start the CRS ./crsctl start crs.
Solution:-
As root user executed the command
crsctl add res ora.gipcd -type ora.gipc.type -attr "ACL='owner:oragrid:rw-,pgrp:oinstall:rw-,other::r--,user:oragrid:rwx'" -init
Here oragrid is the grid user and oinstall is the group.
Now start the CRS ./crsctl start crs.