Exactly one, and in the « Command line » column I see it has the arguments I passed it so
that’s the one

De : Eli Zaretskii<mailto:eliz@gnu.org>
Envoyé le :samedi 6 mars 2021 20:01
À : Matt M<mailto:mmerino@outlook.fr>
Cc : 46972@debbugs.gnu.org<mailto:46972@debbugs.gnu.org>
Objet :Re: RE : bug#46972: 28.0.50; [feature/native-comp] Emacs locks itself during native compilation because of permission denied

> From: Matt M <mmerino@outlook.fr>
> CC: "46972@debbugs.gnu.org" <46972@debbugs.gnu.org>
> Date: Sat, 6 Mar 2021 18:52:51 +0000
>
> It doesn’t seem to ever end. Just to make sure I’ve tried it again 10 minutes ago.
> Command is hanging and the process uses 0% cpu. I’ll let it run just in case.

If it uses 0% CPU, then waiting won't help.

How many Emacs processes are running on the system?