From: "zzak (zzak _) via ruby-core" <ruby-core@...>
Date: 2025-05-27T15:03:02+00:00
Subject: [ruby-core:122312] [Ruby Bug#21368] Moving objects with finalizer between Ractors crashes

Issue #21368 has been updated by zzak (zzak _).


It seemed fun to patch, but I'm not sure this is correct:
https://github.com/ruby/ruby/pull/13452

----------------------------------------
Bug #21368: Moving objects with finalizer between Ractors crashes
https://bugs.ruby-lang.org/issues/21368#change-113454

* Author: peterzhu2118 (Peter Zhu)
* Status: Open
* Assignee: ractor
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
When an object is moved to a different Ractor, the finalizers are not copied to the new object, so it will have the `FL_FINALIZE` flag set but no entry in the finalizer table.

The following script crashes:

```ruby
r = Ractor.new do
  loop { Ractor.receive }
end

1_000.times do
  o = Object.new
  ObjectSpace.define_finalizer(o, proc { |id| })
  r.send(o, move: true)
end
```



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