On the latest master 1f655b864f280593dd1f0367e66ee9a2c6bb0f44 ,

I see "require 'timeout_interrupt'" is called.

spec/lite_spec_helper.rb

if SpecConfig.instance.mri?
  require 'timeout_interrupt'
else
  require 'timeout'
  TimeoutInterrupt = Timeout
end

However the part outputs an error on my Fedora 34 and 33 environment when running the spec.

Here are the tickets I opened to the upstream projects.
https://github.com/DenisKnauf/ruby-timeout-interrupt/issues/5
https://github.com/postmodern/ffi-libc/issues/6

It's great if Mongo Ruby driver have a temporary workaround to avoid the code when running the spec.

Thanks.