Comment 2 for bug 1978272

BTW, just for completeness here: Fedora's squid cap the maximum open file descriptors limit for squid in the systemd service file. If that is not present, squid will most likely crash on startup if max_filedescriptors is not set in the configuration file.

https://src.fedoraproject.org/rpms/squid/blob/rawhide/f/squid.service#_8