Fork method and Phusion Passenger

[taq]

Issue report

Not sure if I need to open this ticket here or on FFI issues, so I'll open in both. I'm using Passenger for years, and this is the first time I got such an error. On the Nginx log, I can see:

ruby/2.5.0/gems/ffi-1.17.1/lib/ffi/ffi.rb:72:in `fork': super: no superclass method `fork' for PhusionPassenger::PreloaderSharedHelpers:Module (NoMethodError)

Downgrading FFI to 1.17.0 everything is fine. Is this a FFI or a Passenger issue?

Are you sure this is a bug in Passenger?

As said above, not really sure, but something there is wrong.

Question 1: What is the problem?

Seems the fork method is missing.

Question 2: Passenger version and integration mode:

6.0.24-1, open source

Question 3: OS or Linux distro, platform (including version):

Distributor ID: Ubuntu
Description:    Ubuntu 20.04.6 LTS
Release:        20.04
Codename:       focal

Question 4: Passenger installation method:

[ ] RubyGems + Gemfile
[ ] RubyGems, no Gemfile
[x] Phusion APT repo
[ ] Phusion YUM repo
[ ] OS X Homebrew
[ ] source tarball
[ ] Other, please specify:

Question 5: Your app's programming language (including any version managers) and framework (including versions):

Ruby 2.5.1, Rails 5.2.0

Question 6: Are you using a PaaS and/or containerization? If so which one?

No

Question 7: Anything else about your setup that we should know?

Not really.