Michael Paquier <michael.paqu...@gmail.com> writes:
> In order to reproduce the failure I have just inserted a manual
> pg_usleep before looping through the list of orphan_oids, and after
> dropping manually from another session a couple of orphaned temporary
> tables I was able to see the failure. Attached is a proposal of patch.

That's not really adequate, because acquiring the lock doesn't prove that
the table still exists; you might just be holding a useless lock against
a now-unused OID.  You really need to do something to verify that the
table's catalog entries are still visible after you have the lock.

                        regards, tom lane

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