From: "luke-gru (Luke Gruber) via ruby-core" <ruby-core@...>
Date: 2025-05-20T13:46:10+00:00
Subject: [ruby-core:122209] [Ruby Bug#21354] Symbol#to_proc is not ractor safe

Issue #21354 has been updated by luke-gru (Luke Gruber).


PR here: https://github.com/ruby/ruby/pull/13380

----------------------------------------
Bug #21354: Symbol#to_proc is not ractor safe
https://bugs.ruby-lang.org/issues/21354#change-113357

* Author: luke-gru (Luke Gruber)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
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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