#673

For looped private synonyms, try:

select owner, synonym_name, connect_by_iscycle CYCLE
from dba_synonyms
where connect_by_iscycle > 0
connect by nocycle prior table_owner = owner
and prior table_name = synonym_name; 

To find public synonyms for non existant objects which will generate the looping error as well:

select owner, synonym_name, connect_by_iscycle CYCLE
from dba_synonyms
where connect_by_iscycle > 0
connect by nocycle prior table_name = synonym_name
and prior table_owner = owner
union
select 'PUBLIC', synonym_name, 1
from dba_synonyms
where owner = 'PUBLIC'
and table_name = synonym_name
and (table_name, table_owner) not in (select object_name, owner from dba_objects
where object_type != 'SYNONYM') 

database, oracle

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