If you enable JIT and your php-fpm keeps dying, and you're on a RHEL type system (Centos, Rocky Linux, etc) - and have selinux enabled - run this command to give php-fpm permission.
[root@pc-web1 html]# setsebool -P httpd_execmem on
[root@pc-web1 html]#
And you can check the permission via...