From: "byroot (Jean Boussier) via ruby-core" <ruby-core@...>
Date: 2025-05-09T08:19:14+00:00
Subject: [ruby-core:121935] [Ruby Bug#20165] Ractors moving a Struct breaks beyond the first 3 fields

Issue #20165 has been updated by byroot (Jean Boussier).

Status changed from Open to Closed

Duplicate of: [Bug #20271] [Bug #20267] [Bug #20255]

This was fixed in 0350290262ea0fbc4e1807901797ee8a6970c2b9 and a few followups.



----------------------------------------
Bug #20165: Ractors moving a Struct breaks beyond the first 3 fields
https://bugs.ruby-lang.org/issues/20165#change-113046

* Author: codekitchen (Brian Palmer)
* Status: Closed
* Assignee: ractor
* ruby -v: ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [arm64-darwin23]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Experimenting with Ractors on ruby 3.3.0, and I'm seeing a bug where if you move a struct between ractors, all but the first 3 fields are set to nil.

``` ruby
Foo = Struct.new(:a,:b,:c,:d,:e,:f)

r = Ractor.new {
  foo = Foo[0,0,0,0,0,0]
  p foo
  Ractor.yield(foo, move: true)
}
p r.take

```


```
��� ruby -v
ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [arm64-darwin23]
��� ruby rbug.rb       
rbug.rb:3: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues.
#<struct Foo a=0, b=0, c=0, d=0, e=0, f=0>
#<struct Foo a=0, b=0, c=0, d=nil, e=nil, f=nil>
```

This seems specific to moving, if I set `move: false` the struct makes it across OK.



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