From: jean.boussier@...
Date: 2021-07-08T18:30:46+00:00
Subject: [ruby-core:104546] [Ruby master Bug#18030] Backport 1fac99afdae2671a9ca86bead5bde4d0e2eff1b4

Issue #18030 has been reported by byroot (Jean Boussier).

----------------------------------------
Bug #18030: Backport 1fac99afdae2671a9ca86bead5bde4d0e2eff1b4
https://bugs.ruby-lang.org/issues/18030

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Ruby 3.0 is impacted by this bug too.

Ruby 2.7 and older is fine.

https://github.com/ruby/ruby/pull/4342

repro script

```ruby
require 'objspace'
ObjectSpace.trace_object_allocations do
  GC.stress = true
  class A
    define_singleton_method(:foo) { }
  end
  p A.foo
end
```



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