From: "byroot (Jean Boussier) via ruby-core" <ruby-core@...>
Date: 2025-03-10T20:39:35+00:00
Subject: [ruby-core:121278] [Ruby master Bug#21179] Introduction Happy Eyeballs Version 2 broke `Socket.tcp` from secondary Ractors

Issue #21179 has been reported by byroot (Jean Boussier).

----------------------------------------
Bug #21179: Introduction Happy Eyeballs Version 2 broke `Socket.tcp` from secondary Ractors
https://bugs.ruby-lang.org/issues/21179

* Author: byroot (Jean Boussier)
* Status: Open
* Backport: 3.1: DONTNEED, 3.2: DONTNEED, 3.3: DONTNEED, 3.4: REQUIRED
----------------------------------------
```ruby
require "socket"

Ractor.new do
  Socket.tcp("example.com", 80)
end.take
```

```
socket.rb:1046:in 'Socket::HostnameResolutionStore#get_addrinfo': can not access non-shareable objects in constant
Socket::HostnameResolutionStore::PRIORITY_ON_V6 by non-main ractor. (Ractor::IsolationError)
	from socket.rb:724:in 'block in Socket.tcp_with_fast_fallback'
	from socket.rb:720:in 'Socket.tcp_with_fast_fallback'
```

Proposed patch: https://github.com/ruby/ruby/pull/12896



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