Thomas Munro <> writes:
> Ahh, I think I see it.  This is an EXEC_BACKEND build farm animal.
> Theory: After the backend we see had removed the scratch entry and
> before it had restored it, another backend started up and ran
> InitPredicateLocks(), which inserted a new scratch entry without
> interlocking.

Ouch.  Yes, I think you're probably right.  It needs to skip that if
IsUnderPostmaster.  Seems like there ought to be an Assert(!found)
there, too.  And I don't think I entirely like the fact that there's
no assertions about the found/not found cases below, either.

Will fix, unless you're already on it?

                        regards, tom lane

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