Jeremy Drake <pgsql(at)jdrake(dot)com> writes:
> Here is some additional information that I have managed to gather today
> regarding this. It is not really what causes it, so much as what does
> not.
> ...
> Similar for pg_type, there being 248 index row versions vs 244 row
> versions in the table.
The ReadBuffer bug I just fixed could result in disappearance of catalog
rows, so this observation is consistent with the theory that that's
what's biting you. It's not proof though...
regards, tom lane