Re: AlterSubscription_refresh "wrconn" wrong variable?

On Tue, May 4, 2021 at 2:31 PM Andres Freund <andres@anarazel.de> wrote:
>
> Hi,
>
> On 2021-05-04 09:29:42 +1000, Peter Smith wrote:
> > While reviewing some logical replication code I stumbled across a
> > variable usage that looks suspicious to me.
>
> > Note that the AlterSubscription_refresh function (unlike other
> > functions in the subscriptioncmds.c) is using the global variable
> > "wrconn" instead of a local stack variable of the same name. I was
> > unable to think of any good reason why it would be deliberately doing
> > this, so my guess is that it is simply an accidental mistake that has
> > gone unnoticed because the compiler was silently equally happy just
> > using the global var.
>
> > Apparently, this is not causing any reported problems because it seems
> > like the code has been this way for ~4 years [1].
>
> This sounded vaguely familiar. After a bit of searching I found that's
> because I debugged a crash related to it:
> https://www.postgresql.org/message-id/20201111215820.qihhrz7fayu6myfi%40alap3.anarazel.de
>

Oh! No wonder it sounded familiar.

It looks like I've just re-discovered the identical problem 5 months
after your post.

------
Kind Regards,
Peter Smith.
Fujitsu Australia