Re: BUG #6706: pg_upgrade fails when plpgsql dropped/re-created

Andres Freund-3 wrote
> cowwoc just talked about this on irc, and the explanation very likely is
> that the extension commands are run in parallel on several
> connections.
>
> Greetings,
>
> Andres Freund

Correct. Executing

CREATE EXTENSION IF NOT EXISTS hstore SCHEMA public

concurrently from multiple connections triggers the error in question.
Andres suggested the following workaround which worked for me:

LOCK pg_extension;
CREATE EXTENSION IF NOT EXISTS hstore SCHEMA public;

Meaning, simply lock pg_extension before attempting to create the extension.

Gili

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