https://git.ruby-lang.org/ruby.git/commit/?id=8bdb56fcaf

From 8bdb56fcaf16ddac761ee5d00cd6cff6b5434640 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Rodr=C3=ADguez?= <deivid.rodriguez@r...>
Date: Thu, 4 Nov 2021 13:40:53 +0100
Subject: [rubygems/rubygems] Protect specs access at a finer level

https://github.com/rubygems/rubygems/commit/c8cc053bde
---
 lib/rubygems/installer.rb     | 12 ++----------
 lib/rubygems/specification.rb | 16 ++++++++++------
 2 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/lib/rubygems/installer.rb b/lib/rubygems/installer.rb
index dd6dd06eef9..10341a9398c 100644
--- a/lib/rubygems/installer.rb
+++ b/lib/rubygems/installer.rb
@@ -67,8 +67,6 @@ class Gem::Installer https://github.com/ruby/ruby/blob/trunk/lib/rubygems/installer.rb#L67
 
   @path_warning = false
 
-  @install_lock = Thread::Mutex.new
-
   class << self
     #
     # Changes in rubygems to lazily loading `rubygems/command` (in order to
@@ -92,12 +90,6 @@ class Gem::Installer https://github.com/ruby/ruby/blob/trunk/lib/rubygems/installer.rb#L90
 
     attr_accessor :path_warning
 
-    ##
-    # Certain aspects of the install process are not thread-safe. This lock is
-    # used to allow multiple threads to install Gems at the same time.
-
-    attr_reader :install_lock
-
     ##
     # Overrides the executable format.
     #
@@ -342,7 +334,7 @@ class Gem::Installer https://github.com/ruby/ruby/blob/trunk/lib/rubygems/installer.rb#L334
 
     say spec.post_install_message if options[:post_install_message] && !spec.post_install_message.nil?
 
-    Gem::Installer.install_lock.synchronize { Gem::Specification.reset }
+    Gem::Specification.reset
 
     run_post_install_hooks
 
@@ -527,7 +519,7 @@ class Gem::Installer https://github.com/ruby/ruby/blob/trunk/lib/rubygems/installer.rb#L519
   end
 
   def generate_plugins # :nodoc:
-    latest = Gem::Installer.install_lock.synchronize { Gem::Specification.latest_spec_for(spec.name) }
+    latest = Gem::Specification.latest_spec_for(spec.name)
     return if latest && latest.version > spec.version
 
     ensure_writable_dir @plugins_dir
diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index 2388354f677..d22b0156e36 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -179,14 +179,18 @@ class Gem::Specification < Gem::BasicSpecification https://github.com/ruby/ruby/blob/trunk/lib/rubygems/specification.rb#L179
   end
 
   def self.clear_specs # :nodoc:
-    @@all = nil
-    @@stubs = nil
-    @@stubs_by_name = {}
-    @@spec_with_requirable_file = {}
-    @@active_stub_with_requirable_file = {}
+    @@all_specs_mutex.synchronize do
+      @@all = nil
+      @@stubs = nil
+      @@stubs_by_name = {}
+      @@spec_with_requirable_file = {}
+      @@active_stub_with_requirable_file = {}
+    end
   end
   private_class_method :clear_specs
 
+  @@all_specs_mutex = Thread::Mutex.new
+
   clear_specs
 
   # Sentinel object to represent "not found" stubs
@@ -750,7 +754,7 @@ class Gem::Specification < Gem::BasicSpecification https://github.com/ruby/ruby/blob/trunk/lib/rubygems/specification.rb#L754
   attr_accessor :specification_version
 
   def self._all # :nodoc:
-    @@all ||= Gem.loaded_specs.values | stubs.map(&:to_spec)
+    @@all_specs_mutex.synchronize { @@all ||= Gem.loaded_specs.values | stubs.map(&:to_spec) }
   end
 
   def self.clear_load_cache # :nodoc:
-- 
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