diff --git a/KNOWNBUGS.rb b/KNOWNBUGS.rb
index 2e4f058661..b97a08d928 100644
--- a/KNOWNBUGS.rb
+++ b/KNOWNBUGS.rb
@@ -3,14 +3,3 @@
 # So all tests will cause failure.
 #
 
-assert_normal_exit %q{
-  require 'timeout'
-  timeout(2) do
-    loop do
-      def x
-        "hello" * 1000
-      end
-      method(:x).call
-    end
-  end
-}, '[ruby-core:53640] [Bug #8100]'
diff --git a/test/ruby/test_method.rb b/test/ruby/test_method.rb
index ea81fdb83a..167234bb1a 100644
--- a/test/ruby/test_method.rb
+++ b/test/ruby/test_method.rb
@@ -576,4 +576,17 @@ class TestMethod < Test::Unit::TestCase
       IRB.start
     }, '[Bug #7825]'
   end
+
+  def test_unlinked_method_entry_in_method_object_bug
+    bug8100 = '[ruby-core:53640] [Bug #8100]'
+    assert_ruby_status [], %q{
+      loop do
+        def x
+          "hello" * 1000
+        end
+        method(:x).call
+      end
+    }, bug8100, timeout: 2
+  rescue Timeout::Error
+  end
 end