Cucumber / RSpec / TruffleRuby error in CI: ArgumentError: circular causes

[luke-hill]

cf: https://github.com/cucumber/cucumber-ruby/actions/runs/15073041019/job/42373911130?pr=1782

I'm not 100% sure of the error because there's not much of a stacktrace. But quite simple tests which pass in all other rubies fail in Truffleruby for some reason.

In TruffleRuby head (2 months ago)

truffleruby 25.0.0-dev-d3120a20, like ruby 3.3.7, GraalVM CE Native [x86_64-linux]

These tests passed

In TruffleRuby today

truffleruby 25.0.0-dev-a65bde3d, like ruby 3.3.7, GraalVM CE Native [x86_64-linux]

These tests fail.

Tests in question are 3 that use the follow snippet style: allow(registry.current_world).to receive(:target) { target }

Any advice / next steps greatly appreciated

Luke - Cucumber Ruby Lead

[ankane]

Was just about to report this as well. Here's a simple repro script:

begin
  begin
    raise "Error 1"
  rescue
    raise "Error 2"
  end
rescue => e
  raise e.cause
end

CRuby

repro.rb:3:in '<main>': Error 1 (RuntimeError)

truffleruby 25.0.0-dev-a65bde3d

<internal:core> core/kernel.rb:716:in `raise': circular causes (ArgumentError)
	from repro.rb:8:in `<main>'
repro.rb:5:in `<main>': Error 2 (RuntimeError)
repro.rb:3:in `<main>': Error 1 (RuntimeError)

[andrykonchin]

Thank you for the report, we'll look into it.

[andrykonchin]

It seems it's caused by #3857.

In the mentioned example

begin
  begin
    raise "Error 1"
  rescue
    raise "Error 2"
  end
rescue => e
  raise e.cause
end

the last #raise (that's raise e.cause) assigns a cause to the raised exception but CRuby by some reason doesn't do so. Added in #3857 check for circular causes detects a circle (as far as now we have a circle in the causes chain: "Error 1" -> "Error 2" -> "Error 1") and raises circular causes (ArgumentError).