title: kernel_gem.rb:67:in `synchronize': deadlock; recursive locking (ThreadError)
body: <p>when I run this command on macOS Big Sur 11.2.3:</p>
  <pre><code>pod setup
  </code></pre>
  <p>shows this error:</p>
  <pre><code>$ pod setup                                                                                                                                                           ‹ruby-2.7.2›
  Traceback (most recent call last):
      12: from /Users/dolphin/.rvm/gems/ruby-2.7.2/bin/ruby_executable_hooks:22:in `&lt;main&gt;'
      11: from /Users/dolphin/.rvm/gems/ruby-2.7.2/bin/ruby_executable_hooks:22:in `eval'
      10: from /Users/dolphin/.rvm/gems/ruby-2.7.2/bin/pod:23:in `&lt;main&gt;'
       9: from /Users/dolphin/.rvm/rubies/ruby-2.7.2/lib/ruby/site_ruby/2.7.0/rubygems.rb:304:in `activate_bin_path'
       8: from /Users/dolphin/.rvm/rubies/ruby-2.7.2/lib/ruby/site_ruby/2.7.0/rubygems.rb:304:in `synchronize'
       7: from /Users/dolphin/.rvm/rubies/ruby-2.7.2/lib/ruby/site_ruby/2.7.0/rubygems.rb:306:in `block in activate_bin_path'
       6: from /Users/dolphin/.rvm/rubies/ruby-2.7.2/lib/ruby/site_ruby/2.7.0/rubygems.rb:243:in `finish_resolve'
       5: from /Users/dolphin/.rvm/rubies/ruby-2.7.2/lib/ruby/site_ruby/2.7.0/rubygems/request_set.rb:435:in `resolve_current'
       4: from /Users/dolphin/.rvm/rubies/ruby-2.7.2/lib/ruby/site_ruby/2.7.0/rubygems/request_set.rb:435:in `new'
       3: from /Users/dolphin/.rvm/rubies/ruby-2.7.2/lib/ruby/site_ruby/2.7.0/rubygems/resolver/set.rb:24:in `initialize'
       2: from /Users/dolphin/.rvm/rubies/ruby-2.7.2/lib/ruby/site_ruby/2.7.0/rubygems/core_ext/kernel_require.rb:42:in `require'
       1: from /Users/dolphin/.rvm/rubies/ruby-2.7.2/lib/ruby/site_ruby/2.7.0/rubygems/core_ext/kernel_gem.rb:67:in `gem'
  /Users/dolphin/.rvm/rubies/ruby-2.7.2/lib/ruby/site_ruby/2.7.0/rubygems/core_ext/kernel_gem.rb:67:in `synchronize': deadlock; recursive locking (ThreadError)
  (base)
  </code></pre>
  <p>I am searching from internet but did not found some useful imformation about this problem. I have tried to reinstall <code>cocoapods</code> still not fix this. what should I do to fix this problem? this is my ruby env:</p>
  <pre><code>~/source/cruise-open on  main ⌚ 13:37:15
  $ rvm list                                                                                                                                                            ‹ruby-2.7.2›
  =* ruby-2.7.2 [ x86_64 ]
     ruby-3.0.0 [ x86_64 ]
  
  # =&gt; - current
  # =* - current &amp;&amp; default
  #  * - default
  
  (base)
  </code></pre>
  <p>right now I found run <code>pod install</code> command still show this error.</p>