----- Original Message -----
> From: John Scalia <jayknowsunix@gmail.com>
> To: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
> Cc:
> Sent: Tuesday, 20 January 2015, 18:12
> Subject: [ADMIN] cannot drop an extension
>
> Hi all,
>
> My pg_upgrade woes continue... The primary server, V9.3.3, was originally used
> as a testbed for pgpool-II, although we ended up chosing pacemaker and corosync
> instead. When pgpool
> was installed, the instructions have you add a pgpool-regclass extension.
> Naturally, trying to upgrade to V9.4.0 fails and pg_upgrade writes a
> loadable_libraries.txt saying that
> $libdir/pgpool-regclass cannot be found. So, I restarted the original database,
> and connected to both my csg_db instance and to the template1 instance, then
> tried issuing a "drop
> extension pgpool-reglass", but the both the db's say it does not exist.
> I also tried dropping it by enclosing the extension name in quotes, both single
> and double with no joy.
> Then, I tried looking in pg_extensions, but I didn't see any similar entry
> there either. How can I get rid of this extension so that pg_upgrade will
> complete successfully? I've
> asked on the pgpool admin list, but as it's the middle of the night in
> Japan, I'm not expecting an immediate answer, if any.
Sounds like you need to remove the pgpool-regclass entry from the shared_preload_libraries entry in your
postgresql.conf
