Re: PANIC: wrong buffer passed to visibilitymap_clear

I wrote:
> (It does look like RelationGetBufferForTuple
> knows about updating vmbuffer, but there's one code path through the
> if-nest at 3850ff that doesn't call that.)

Although ... isn't RelationGetBufferForTuple dropping the ball on this
point too, in the code path at the end where it has to extend the relation?

I'm now inclined to think that we should toss every single line of that
code, take RelationGetBufferForTuple out of the equation, and have just
*one* place that rechecks for PageAllVisible having just become set.
It's a rare enough case that optimizing it is completely not worth the
code complexity and risk (er, reality) of hard-to-locate bugs.

			regards, tom lane