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April 2025

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[ruby-core:121490] [Ruby Bug#21208] `Ractor#send(move: true)` allow moving objects that are on the stack, and used by C code.
by byroot (Jean Boussier) 01 Apr '25

01 Apr '25

Issue #21208 has been reported by byroot (Jean Boussier). ---------------------------------------- Bug #21208: `Ractor#send(move: true)` allow moving objects that are on the stack, and used by C code. https://bugs.ruby-lang.org/issues/21208 * Author: byroot (Jean Boussier) * Status: Open * Assignee: ractor * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- The following script causes a crash: ```ruby rac = Ractor.new do Ractor.receive end hash = Hash[*50.times] hash.merge!(12 => 0, 14 => 0) do |key, old_val, new_val| if key == 12 rac.send(hash, move: true) end new_val end p rac.take ``` Contrary to previous crashes related to `send(move: true)`, I'm afraid this one is with the design of the feature itself, not just the implementation. If we allow objects to be moved, any C code that calls `rb_yield()` may cause memory corruption if one of the objects it uses is moved. I personally can't see any realistic solution to this. -- https://bugs.ruby-lang.org/

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