PHP crash on POST

[badfiles]

Hi,
when the browser is sending a POST
get_action=get_my_feed&options=al&dir=%2F&format=xml&current_repository=true&feed_type=notif&limit=18&path=%2F&merge_description=true&description_as_label=false&secure_token=zaLJemvT9q41Sd3znJvnTsQn4zFjAvNv
php craches and I get 502 BAD gateway.

Other functions work well.
I get nothing in the logs, php-fpm exits with a segfault (PHP is asked to allocate an overwhelmingly huge amount of memory, mem_limit is set to 512M

The same issue happens when posting get_action: list_all_plugins_actions, but this one happens not all the time, so it is still possible to catch a reply to create a task for the scheduler.

PHP 7.2, webserver nginx
Pydio 8.2.2