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 ---------------------------------------- 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 ---------------------------------------- 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/