Issue #21149 has been updated by nobu (Nobuyoshi Nakada). Interesting. It seems irrelevant what is done in the new Ractor. Even if the block is empty, the result is same. ---------------------------------------- Bug #21149: Strange behavior of ObjectSpace.each_object after Ractor.new https://bugs.ruby-lang.org/issues/21149#change-112045 * Author: wanabe (_ wanabe) * Status: Open * ruby -v: ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- I found the strange behavior of `ObjectSpace.each_object`. It misses some objects after `Ractor.new`. ``` $ ruby -ve 'class Foo; end; foo = Foo.new; Ractor.new do buz = Foo.new end.take; bar = Foo.new; p [ObjectSpace.each_object(Foo).to_a, foo.class, bar.class]' ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [x86_64-linux] -e:1: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues. [[], Foo, Foo] ``` Of course it works well without `Ractor.new`. ``` $ ruby -ve 'class Foo; end; foo = Foo.new; bar = Foo.new; p [ObjectSpace.each_object(Foo).to_a, foo.class, bar.class]' ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [x86_64-linux] [[#<Foo:0x00007fa84f4b26d0>, #<Foo:0x00007fa84f4b27c0>], Foo, Foo] ``` -- https://bugs.ruby-lang.org/