[ruby-core:122685] [Ruby Bug#21505] [Ractor] calling exit from non-main ractor will hang if main ractor waits on it

8 Jul 2025

      Issue #21505 has been reported by luke-gru (Luke Gruber).

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Bug #21505: [Ractor] calling exit from non-main ractor will hang if main ractor waits on it
https://bugs.ruby-lang.org/issues/21505

* Author: luke-gru (Luke Gruber)
* Status: Open
* Assignee: ractor
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
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```ruby
r = Ractor.new do
  exit
end

r.join # hangs
```

Should `exit` be allowed in ractors? It would be easiest to disallow, as the code might be tricky if we allow it.

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