Jeremy Wilson <jwilson(at)clover(dot)co> writes:
> [ no soap on either of my theories ]
Hmph. We know that 9.5 -> 13 pg_upgrade works in simple scenarios,
because the buildfarm tests that every day. So there has to be
something out of the ordinary about your setup. Any unusual
extensions, pg_hba.conf configuration, etc?
regards, tom lane