I have a test where a user creates a temp table and then disconnect, concurrently we try to do DROP OWNED BY CASCADE on the same user. Seems this causes race condition between temptable deletion during disconnection (@RemoveTempRelations(myTempNamespace)) and DROP OWNED BY CASCADE operation which will try to remove same temp table when they find them as part of pg_shdepend. Which will result in internal error cache lookup failed as below.
DROP OWNED BY test_role CASCADE;
2020-01-07 12:35:06.524 IST [26064] ERROR: cache lookup failed for relation 41019
2020-01-07 12:35:06.524 IST [26064] STATEMENT: DROP OWNED BY test_role CASCADE;
reproduce.sql:8: ERROR: cache lookup failed for relation 41019
TEST
=====================
create database test_db;
create user test_superuser superuser;
\c test_db test_superuser
CREATE ROLE test_role nosuperuser login password 'test_pwd' ;
\c test_db test_role
CREATE TEMPORARY TABLE tmp_table(col1 int);
\c test_db test_superuser
DROP OWNED BY test_role CASCADE;
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