Redmine

I was able to reproduce a problem that looked like that.
I switched to 5.1-stable and then deleted the Gemfile.lock in my development environment and did a bundle install.

/usr/local/lib/ruby/gems/3.2.0/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:16:in `<module:LoggerThreadSafeLevel>': uninitialized constant ActiveSupport::LoggerThreadSafeLevel::Logger (NameError)

    Logger::Severity.constants.each do |severity|
          ^^^^^^^^^^
        from /usr/local/lib/ruby/gems/3.2.0/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:9:in `<module:ActiveSupport>'
        from /usr/local/lib/ruby/gems/3.2.0/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:8:in `<top (required)>'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from /usr/local/lib/ruby/gems/3.2.0/gems/activesupport-6.1.7.10/lib/active_support/logger_silence.rb:5:in `<top (required)>'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from /usr/local/lib/ruby/gems/3.2.0/gems/activesupport-6.1.7.10/lib/active_support/logger.rb:3:in `<top (required)>'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from /usr/local/lib/ruby/gems/3.2.0/gems/activesupport-6.1.7.10/lib/active_support.rb:29:in `<top (required)>'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from /usr/local/lib/ruby/gems/3.2.0/gems/railties-6.1.7.10/lib/rails/command.rb:3:in `<top (required)>'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from /usr/local/lib/ruby/gems/3.2.0/gems/railties-6.1.7.10/lib/rails/commands.rb:3:in `<top (required)>'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from <internal:/usr/local/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
        from bin/rails:4:in `<main>'

I have confirmed that the issue can be resolved by making the following changes, as referenced in https://github.com/rails/rails/pull/54264#issuecomment-2596149819 .

diff --git a/Gemfile b/Gemfile
index 290011946..68f40f2bb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,6 +15,7 @@ gem 'i18n', '~> 1.14.1'
 gem 'rbpdf', '~> 1.21.3'
 gem 'addressable'
 gem 'rubyzip', '~> 2.3.0'
+gem 'concurrent-ruby', '< 1.3.5'

 #  Ruby Standard Gems
 gem 'csv', '~> 3.2.6'

Although this is not a Redmine-specific issue, Rails 6.1 has already reached EOL. If Redmine 5.1 is to continue being supported, it might be necessary for the Redmine project to address this problem on its end.

This issue does not reproduce on Redmine 6.0-stable or trunk

Another workaround:

Index: config/boot.rb
===================================================================
--- config/boot.rb    (revision 23435)
+++ config/boot.rb    (working copy)
@@ -4,3 +4,5 @@
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)

 require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
+
+require 'logger'

Go MAEDA wrote in #note-5:

Another workaround:

[...]

Good. I think your solution works better.

Thanks for the quick response.
I forgot to mention the 5.0-stable branch, sorry.
I get the same error on the 5.0-stable branch, will it be committed on there too?

Abe Tomoaki wrote in #note-9:

I forgot to mention the 5.0-stable branch, sorry.
I get the same error on the 5.0-stable branch, will it be committed on there too?

Although Redmine 5.0 is no longer maintained, this issue is critical as it prevents Redmine from starting. Therefore, I have committed the fix in r23444.

Thank you for the fix. Can you please confirm that this issue is fixed in any of the official download links, such as 5.1.5 or 5.0.10?

I spent the whole day yesterday trying to run Redmine on different operating systems and logged ticket #42120.