[ruby-core:122212] [Ruby Bug#21354] Symbol#to_proc is not ractor safe

Issue #21354 has been updated by nobu (Nobuyoshi Nakada).

Assignee set to ko1 (Koichi Sasada)
Backport changed from 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN to 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED

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Bug #21354: Symbol#to_proc is not ractor safe
https://bugs.ruby-lang.org/issues/21354#change-113360

* Author: luke-gru (Luke Gruber)
* Status: Open
* Assignee: ko1 (Koichi Sasada)
* Backport: 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED
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There is caching in `Symbol#to_proc` (`rb_sym_to_proc`) that makes the assumption that we're always in the main ractor. With multiple ractors, this caching logic is not ractor-safe in that cached procs created in one ractor can leak into other ractors. In a debug build, this results in a `ractor_confirm_belonging` assertion failure.

Ruby code that reproduces the issue:

```ruby
  :inspect.to_proc
  Ractor.new do
    :inspect.to_proc
  end.take
```



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