session_start hangs

Question

since a few hours our server hangs every time you do a session_start.

For testing purposes i created a script which looks like this:

Answer 1

I don't know why, but changing this value in /etc/php/7.4/apache2/php.ini worked for me:

;session.save_path = "/var/lib/php/sessions"
session.save_path = "/tmp"