https://git.ruby-lang.org/ruby.git/commit/?id=9a5684bf7f

From 9a5684bf7f92ae71a55ede82ec18c31c161694ec Mon Sep 17 00:00:00 2001
From: Jemma Issroff <jemmaissroff@g...>
Date: Tue, 4 Oct 2022 15:27:13 -0400
Subject: Add test for ractor race condition on ivar sets

---
 bootstraptest/test_ractor.rb | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/bootstraptest/test_ractor.rb b/bootstraptest/test_ractor.rb
index b29db7ab0e..6373349e42 100644
--- a/bootstraptest/test_ractor.rb
+++ b/bootstraptest/test_ractor.rb
@@ -1579,4 +1579,43 @@ assert_equal "ok", %q{ https://github.com/ruby/ruby/blob/trunk/bootstraptest/test_ractor.rb#L1579
   end
 }
 
+assert_equal "ok", %q{
+  module M
+    def foo
+      @foo
+    end
+  end
+
+  class A
+    include M
+
+    def initialize
+      100.times { |i| instance_variable_set(:"@var_#{i}", "bad: #{i}") }
+      @foo = 2
+    end
+  end
+
+  class B
+    include M
+
+    def initialize
+      @foo = 1
+    end
+  end
+
+  Ractor.new do
+    b = B.new
+    100_000.times do
+      raise unless b.foo == 1
+    end
+  end
+
+  a = A.new
+  100_000.times do
+    raise unless a.foo == 2
+  end
+
+  "ok"
+}
+
 end # if !ENV['GITHUB_WORKFLOW']
-- 
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