Re: [PATCH] pg_stat_activity: make slow/hanging authentication more visible

On Mon, Jul 08, 2024 at 02:09:21PM -0700, Jacob Champion wrote:
> On Sun, Jun 30, 2024 at 10:48 AM Noah Misch <noah@leadboat.com> wrote:
> > That said, it
> > may be more fruitful to arrange for authentication timeout to cut through PAM
> > etc.
> 
> That seems mostly out of our hands -- the misbehaving modules are free
> to ignore our signals (and do). Is there another way to force the
> issue?

Two ways at least (neither of them cheap):
- Invoke PAM in a subprocess, and SIGKILL that process if needed.
- Modify the module to be interruptible.

> > Hanging connection slots hurt even if they lack an xmin.
> 
> Oh, would releasing the xmin not really move the needle, then?

It still moves the needle.