From: "luke-gru (Luke Gruber) via ruby-core" <ruby-core@...>
Date: 2024-01-10T19:26:14+00:00
Subject: [ruby-core:116158] [Ruby master Bug#20165] Ractors moving a Struct breaks beyond the first 3 fields

Issue #20165 has been updated by luke-gru (Luke Gruber).





I sent a fix for this here https://github.com/ruby/ruby/pull/9475. There were other issues with moving as well, it wasn't just for structs.



----------------------------------------

Bug #20165: Ractors moving a Struct breaks beyond the first 3 fields

https://bugs.ruby-lang.org/issues/20165#change-106163



* Author: codekitchen (Brian Palmer)

* Status: Open

* Priority: Normal

* 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.







-- 

https://bugs.ruby-lang.org/

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