https://git.ruby-lang.org/ruby.git/commit/?id=a815053a3e

From a815053a3ea16382bea8b420a3070b4da3c3bb94 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Tue, 12 Nov 2019 04:03:33 +0900
Subject: check monitor is owning for debug


diff --git a/lib/rubygems/core_ext/kernel_require.rb b/lib/rubygems/core_ext/kernel_require.rb
index f0409d6..dfceb75 100644
--- a/lib/rubygems/core_ext/kernel_require.rb
+++ b/lib/rubygems/core_ext/kernel_require.rb
@@ -157,6 +157,11 @@ module Kernel https://github.com/ruby/ruby/blob/trunk/lib/rubygems/core_ext/kernel_require.rb#L157
     return gem_original_require(path) if require_again
 
     raise load_error
+  ensure
+    if RUBYGEMS_ACTIVATION_MONITOR.mon_owned?
+      pp $!
+      raise "CRITICAL: RUBYGEMS_ACTIVATION_MONITOR is holding."
+    end
   end
 
   private :require
-- 
cgit v0.10.2


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