Re: ThisTimeLineID can be used uninitialized

On 2021-Oct-20, Robert Haas wrote:

> On Tue, Oct 19, 2021 at 7:30 PM Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
> > Hah. Yeah, when you can do things like that and the tests don't break,
> > that indicates a problem in the tests.
>
> I *think* the problem is actually in the code, not the tests. In other
> words, from what I can tell, we copy the bogus timeline value (0, or a
> random number) into several places, but then eventually overwrite all
> copies of that value with a correct value before using it for
> anything. So in other words I think that the comment saying that this
> code is initializing values that WalSndSegmentOpen is going to need is
> just wrong. I don't completely understand why it's wrong, but I think
> it IS wrong.

Oh, I'm not saying that there isn't a problem in the code. I'm just
saying that there is *also* a problem (an omission) in the tests.

--
Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/
"Cómo ponemos nuestros dedos en la arcilla del otro. Eso es la amistad; jugar
al alfarero y ver qué formas se pueden sacar del otro" (C. Halloway en
La Feria de las Tinieblas, R. Bradbury)