[MM3-users] Problem with list creation

Hi,

We want to create thousand of lists. We use a simple curl command

curl --user restadmin:restpass -X POST http://localhost:8001/3.1/lists -d fqdn_listname=nameOfTheList@example.com

After creating ~2k of them we started getting errors in Mailman logs:

[2020-09-16 17:11:10 +0200] [4564] [DEBUG] POST /3.1/lists
[2020-09-16 17:11:41 +0200] [1339] [CRITICAL] WORKER TIMEOUT (pid:4564)
[2020-09-16 17:11:41 +0200] [4564] [INFO] Worker exiting (pid: 4564)
[2020-09-16 17:11:41 +0200] [5019] [INFO] Booting worker with pid: 5019

Since then creation fails in most cases.

We increased timeout in mailman.cfg

[gunicorn]
workers: 4
timeout: 900

And we increased timeout in nginx

http {

          # MODIF UNICORN
     proxy_connect_timeout 300s;
     proxy_read_timeout 300s;
     # MODIF UNICORN

Where might be the problem? How to start investigating and fix it?

Thanks, Paweł