| From: | Noah Misch <noah(at)leadboat(dot)com> |
|---|---|
| To: | Jacob Champion <jacob(dot)champion(at)enterprisedb(dot)com> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Euler Taveira <euler(dot)taveira(at)enterprisedb(dot)com> |
| Subject: | Re: [PATCH] pg_stat_activity: make slow/hanging authentication more visible |
| Date: | 2024-07-09 00:04:01 |
| Message-ID: | 20240709000401.0b.nmisch@google.com |
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| Lists: | pgsql-hackers |
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(at)leadboat(dot)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.
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