[ruby-core:122755] [Ruby Bug#21354] Symbol#to_proc is not ractor safe
From:
"k0kubun (Takashi Kokubun) via ruby-core" <ruby-core@...>
Date:
2025-07-14 21:10:27 UTC
List:
ruby-core #122755
Issue #21354 has been updated by k0kubun (Takashi Kokubun).
Backport changed from 3.2: REQUIRED, 3.3: DONE, 3.4: REQUIRED to 3.2: REQUIRED, 3.3: DONE, 3.4: DONE
ruby_3_4 commit:82e05dc945e3e2c5ab22be661f6caf6c7436461f merged revision(s) commit:f6cbf499bc98b851034fffb49fcbb59d495f6f7b.
----------------------------------------
Bug #21354: Symbol#to_proc is not ractor safe
https://bugs.ruby-lang.org/issues/21354#change-114034
* Author: luke-gru (Luke Gruber)
* Status: Closed
* Assignee: ractor
* Backport: 3.2: REQUIRED, 3.3: DONE, 3.4: DONE
----------------------------------------
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
```
--
https://bugs.ruby-lang.org/
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