GetNewOidWithIndex can cause infinite loop on user tables(not catalog). - Mailing list pgsql-bugs

e.g.
--Create table t(a int) with oids;
--create unique index it on t(oid);
--insert 4G-16384 rows into t;
--insert into t values(1);
    As all oids has been used, GetNewObjectId will never find a usable Oid,
so.....