Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> 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