Can't drop tablespace or user after disk gone - Mailing list pgsql-performance

I had a 'scratch' database for testing, which I deleted, and then disk went out.  No problem, no precious data.  But
nowI can't drop the tablespace, or the user who had that as the default tablespace. 

I thought about removing the tablespace from pg_tablespaces, but it seems wrong to be monkeying with the system tables.
I still can't drop the user, and can't drop the tablespace.  What's the right way to clear out Postgres when a disk
failsand there's no reason to repair the disk? 

Thanks,
Craig