I finally found the actual culprit. It's a Munin-plugin that gets Postfix statistics, it calls postconf to figure out Postfix paths.
While the issue is now clear, I think the symptom is still out there, you can crash postconf if you run it with a user that doesn't have permissions to read every included file in main.cf.
I finally found the actual culprit. It's a Munin-plugin that gets Postfix statistics, it calls postconf to figure out Postfix paths.
While the issue is now clear, I think the symptom is still out there, you can crash postconf if you run it with a user that doesn't have permissions to read every included file in main.cf.