Issue #16904 has been updated by vo.x (Vit Ondruch).


What is wrong with Ruby?

~~~
$ ruby -v
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]

$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 3.1.2
  - RUBY VERSION: 2.7.1 (2020-03-31 patchlevel 83) [x86_64-linux]
  - INSTALLATION DIRECTORY: /usr/local/lib/ruby/gems/2.7.0
  - USER INSTALLATION DIRECTORY: /builddir/.gem/ruby/2.7.0
  - RUBY EXECUTABLE: /usr/local/bin/ruby
  - GIT EXECUTABLE: /usr/bin/git
  - EXECUTABLE DIRECTORY: /usr/local/bin
  - SPEC CACHE DIRECTORY: /builddir/.gem/specs
  - SYSTEM CONFIGURATION DIRECTORY: /usr/local/etc
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /usr/local/lib/ruby/gems/2.7.0
     - /builddir/.gem/ruby/2.7.0
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - https://rubygems.org/
  - SHELL PATH:
     - /usr/local/bin/
     - /usr/bin
     - /bin
     - /usr/sbin
     - /sbin
     - /usr/local/sbin

$ gem list | grep psych
psych (default: 3.1.0)

$ gem install psych --user-install
Fetching psych-3.1.0.gem
WARNING:  You don't have /builddir/.gem/ruby/2.7.0/bin in your PATH,
	  gem executables will not run.
Building native extensions. This could take a while...
Successfully installed psych-3.1.0
Parsing documentation for psych-3.1.0
Installing ri documentation for psych-3.1.0
Done installing documentation for psych after 0 seconds
1 gem installed

$ $ gem list | grep psych
psych (3.1.0)

$ RUBYOPT="--disable-gems" ruby -r psych -e 'require "rubygems"; Gem.load_yaml'
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych.so: warning: already initialized constant Psych::Parser::ANY
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych.so: warning: already initialized constant Psych::Parser::UTF8
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych.so: warning: already initialized constant Psych::Parser::UTF16LE
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych.so: warning: already initialized constant Psych::Parser::UTF16BE
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:7: warning: already initialized constant Psych::ClassLoader::BIG_DECIMAL
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:7: warning: previous definition of BIG_DECIMAL was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:8: warning: already initialized constant Psych::ClassLoader::COMPLEX
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:8: warning: previous definition of COMPLEX was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:9: warning: already initialized constant Psych::ClassLoader::DATE
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:9: warning: previous definition of DATE was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:10: warning: already initialized constant Psych::ClassLoader::DATE_TIME
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:10: warning: previous definition of DATE_TIME was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:11: warning: already initialized constant Psych::ClassLoader::EXCEPTION
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:11: warning: previous definition of EXCEPTION was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:12: warning: already initialized constant Psych::ClassLoader::OBJECT
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:12: warning: previous definition of OBJECT was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:13: warning: already initialized constant Psych::ClassLoader::PSYCH_OMAP
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:13: warning: previous definition of PSYCH_OMAP was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:14: warning: already initialized constant Psych::ClassLoader::PSYCH_SET
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:14: warning: previous definition of PSYCH_SET was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:15: warning: already initialized constant Psych::ClassLoader::RANGE
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:15: warning: previous definition of RANGE was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:16: warning: already initialized constant Psych::ClassLoader::RATIONAL
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:16: warning: previous definition of RATIONAL was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:17: warning: already initialized constant Psych::ClassLoader::REGEXP
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:17: warning: previous definition of REGEXP was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:18: warning: already initialized constant Psych::ClassLoader::STRUCT
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:18: warning: previous definition of STRUCT was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:19: warning: already initialized constant Psych::ClassLoader::SYMBOL
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:19: warning: previous definition of SYMBOL was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/class_loader.rb:65: warning: already initialized constant Psych::ClassLoader::CACHE
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:65: warning: previous definition of CACHE was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/scalar_scanner.rb:9: warning: already initialized constant Psych::ScalarScanner::TIME
/usr/local/lib/ruby/2.7.0/psych/scalar_scanner.rb:9: warning: previous definition of TIME was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/scalar_scanner.rb:12: warning: already initialized constant Psych::ScalarScanner::FLOAT
/usr/local/lib/ruby/2.7.0/psych/scalar_scanner.rb:12: warning: previous definition of FLOAT was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/scalar_scanner.rb:17: warning: already initialized constant Psych::ScalarScanner::INTEGER
/usr/local/lib/ruby/2.7.0/psych/scalar_scanner.rb:17: warning: previous definition of INTEGER was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/stream.rb:13: warning: already initialized constant Psych::Nodes::Stream::ANY
/usr/local/lib/ruby/2.7.0/psych/nodes/stream.rb:13: warning: previous definition of ANY was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/stream.rb:16: warning: already initialized constant Psych::Nodes::Stream::UTF8
/usr/local/lib/ruby/2.7.0/psych/nodes/stream.rb:16: warning: previous definition of UTF8 was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/stream.rb:19: warning: already initialized constant Psych::Nodes::Stream::UTF16LE
/usr/local/lib/ruby/2.7.0/psych/nodes/stream.rb:19: warning: previous definition of UTF16LE was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/stream.rb:22: warning: already initialized constant Psych::Nodes::Stream::UTF16BE
/usr/local/lib/ruby/2.7.0/psych/nodes/stream.rb:22: warning: previous definition of UTF16BE was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/sequence.rb:43: warning: already initialized constant Psych::Nodes::Sequence::ANY
/usr/local/lib/ruby/2.7.0/psych/nodes/sequence.rb:43: warning: previous definition of ANY was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/sequence.rb:46: warning: already initialized constant Psych::Nodes::Sequence::BLOCK
/usr/local/lib/ruby/2.7.0/psych/nodes/sequence.rb:46: warning: previous definition of BLOCK was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/sequence.rb:49: warning: already initialized constant Psych::Nodes::Sequence::FLOW
/usr/local/lib/ruby/2.7.0/psych/nodes/sequence.rb:49: warning: previous definition of FLOW was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/scalar.rb:10: warning: already initialized constant Psych::Nodes::Scalar::ANY
/usr/local/lib/ruby/2.7.0/psych/nodes/scalar.rb:10: warning: previous definition of ANY was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/scalar.rb:13: warning: already initialized constant Psych::Nodes::Scalar::PLAIN
/usr/local/lib/ruby/2.7.0/psych/nodes/scalar.rb:13: warning: previous definition of PLAIN was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/scalar.rb:16: warning: already initialized constant Psych::Nodes::Scalar::SINGLE_QUOTED
/usr/local/lib/ruby/2.7.0/psych/nodes/scalar.rb:16: warning: previous definition of SINGLE_QUOTED was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/scalar.rb:19: warning: already initialized constant Psych::Nodes::Scalar::DOUBLE_QUOTED
/usr/local/lib/ruby/2.7.0/psych/nodes/scalar.rb:19: warning: previous definition of DOUBLE_QUOTED was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/scalar.rb:22: warning: already initialized constant Psych::Nodes::Scalar::LITERAL
/usr/local/lib/ruby/2.7.0/psych/nodes/scalar.rb:22: warning: previous definition of LITERAL was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/scalar.rb:25: warning: already initialized constant Psych::Nodes::Scalar::FOLDED
/usr/local/lib/ruby/2.7.0/psych/nodes/scalar.rb:25: warning: previous definition of FOLDED was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/mapping.rb:17: warning: already initialized constant Psych::Nodes::Mapping::ANY
/usr/local/lib/ruby/2.7.0/psych/nodes/mapping.rb:17: warning: previous definition of ANY was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/mapping.rb:20: warning: already initialized constant Psych::Nodes::Mapping::BLOCK
/usr/local/lib/ruby/2.7.0/psych/nodes/mapping.rb:20: warning: previous definition of BLOCK was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/nodes/mapping.rb:23: warning: already initialized constant Psych::Nodes::Mapping::FLOW
/usr/local/lib/ruby/2.7.0/psych/nodes/mapping.rb:23: warning: previous definition of FLOW was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/visitors/visitor.rb:11: warning: already initialized constant Psych::Visitors::Visitor::DISPATCH
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:11: warning: previous definition of DISPATCH was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/visitors/to_ruby.rb:334: warning: already initialized constant Psych::Visitors::ToRuby::SHOVEL
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:336: warning: previous definition of SHOVEL was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/handler.rb:27: warning: already initialized constant Psych::Handler::OPTIONS
/usr/local/lib/ruby/2.7.0/psych/handler.rb:27: warning: previous definition of OPTIONS was here
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/handler.rb:30: warning: already initialized constant Psych::Handler::EVENTS
/usr/local/lib/ruby/2.7.0/psych/handler.rb:30: warning: previous definition of EVENTS was here
Traceback (most recent call last):
	9: from -e:1:in `<main>'
	8: from /usr/local/lib/ruby/2.7.0/rubygems.rb:696:in `load_yaml'
	7: from /usr/local/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in `require'
	6: from /usr/local/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in `require'
	5: from /builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych.rb:24:in `<top (required)>'
	4: from /usr/local/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in `require'
	3: from /usr/local/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in `require'
	2: from /builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/parser.rb:2:in `<top (required)>'
	1: from /builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/parser.rb:33:in `<module:Psych>'
/builddir/.gem/ruby/2.7.0/gems/psych-3.1.0/lib/psych/parser.rb:34:in `<class:Parser>': superclass mismatch for class Mark (TypeError)
~~~

Just FTR, the patch just hides this issue, it does not resolve it.

The hacks with default gems are hiding a lot of issues. It would be nice if somebody helped to make them less exceptional [1]. Or the `--disable-gems` option should possible be removed if it is not properly supported anymore.


[1]: https://github.com/rubygems/rubygems/pull/2909

----------------------------------------
Bug #16904: rubygems: psych: superclass mismatch for class Mark (TypeError)
https://bugs.ruby-lang.org/issues/16904#change-85743

* Author: jaruga (Jun Aruga)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Is it possible to backport the following commits into Ruby?

Remove explicit `psych` activation
https://github.com/rubygems/rubygems/commit/1ccf0912a161d20e0c4a7b139fd76e8739a411ba

bundler: Remove explicit `psych` activation. 
https://github.com/rubygems/rubygems/commit/88478bb56945ffa9868491cacd0bc74d9d73c848

It causes the following kind of error when psych is installed as not default gem but regular gem. It's a Fedora Ruby specific case. **This is not the case of Ruby built from source normally.**


```
$ cat test.rb 
require 'psych'
Gem.load_yaml # <= The error happens.
```

```
$ ruby test.rb
/usr/lib64/gems/ruby/psych-3.1.0/psych.so: warning: already initialized constant Psych::Parser::ANY
...
/usr/share/gems/gems/psych-3.1.0/lib/psych/parser.rb:34:in `<class:Parser>': superclass mismatch for class Mark (TypeError)
```

It is possibly also related to https://github.com/ruby/psych/issues/386 .

Thank you.



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