[ruby-core:115328] [Ruby master Bug#19996] `RUBY_MN_THREADS=1` triggers Action Cable unit test failures

Issue #19996 has been reported by yahonda (Yasuo Honda).

----------------------------------------
Bug #19996: `RUBY_MN_THREADS=1` triggers Action Cable unit test failures
https://bugs.ruby-lang.org/issues/19996

* Author: yahonda (Yasuo Honda)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0dev (2023-11-09T16:24:15Z :detached: c49adfab5d) +MN [x86_64-linux]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
### Steps to reproduce
1. Install `ruby 3.3.0dev` 
2. Set `RUBY_MN_THREADS=1` environment variable
3. 

git clone https://github.com/rails/rails
cd rails
rm Gemfile.lock
bundle install
cd actioncable
bin/test test/channel/base_test.rb test/subscription_adapter/redis_test.rb test/channel/test_case_test.rb test/subscription_adapter/redis_test.rb test/client_test.rb --seed 14800
```
### Expected behavior
It should pass as not setting 

```
$ unset RUBY_MN_THREADS
$ bin/test test/channel/base_test.rb test/subscription_adapter/redis_test.rb test/channel/test_case_test.rb test/subscription_adapter/redis_test.rb test/client_test.rb --seed 14800
/home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/minitest-5.20.0/lib/minitest.rb:3: warning: mutex_m which will no longer be part of the default gems since Ruby 3.4.0. Add mutex_m to your Gemfile or gemspec.
Run options: --seed 14800

# Running:

.........................................................................

Finished in 12.031310s, 6.0675 runs/s, 46.7115 assertions/s.
73 runs, 562 assertions, 0 failures, 0 errors, 0 skips
$
```

### Actual behavior
It usually fails as follows.

```
$ bin/test test/channel/base_test.rb test/subscription_adapter/redis_test.rb test/channel/test_case_test.rb test/subscription_adapter/redis_test.rb test/client_test.rb --seed 14800
/home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/minitest-5.20.0/lib/minitest.rb:3: warning: mutex_m which will no longer be part of the default gems since Ruby 3.4.0. Add mutex_m to your Gemfile or gemspec.
Run options: --seed 14800

# Running:

..................................................F

Failure:
RedisAdapterTest::AlternateConfiguration#test_channel_prefix [/home/yahonda/src/github.com/rails/rails/actioncable/test/subscription_adapter/common.rb:35]:
Expected #<Concurrent::Event:0x00007f0b2698d4f0 @__Lock__=#<Thread::Mutex:0x00007f0b26f8cab8>, @__Condition__=#<Thread::ConditionVariable:0x00007f0b26f8ca90>, @set=false, @iteration=0> to be set?.


bin/test test/subscription_adapter/channel_prefix.rb:6

.F

Failure:
RedisAdapterTest::AlternateConfiguration#test_multiple_broadcast [/home/yahonda/src/github.com/rails/rails/actioncable/test/subscription_adapter/common.rb:35]:
Expected #<Concurrent::Event:0x00007f0b2698a4d0 @__Lock__=#<Thread::Mutex:0x00007f0b26fac688>, @__Condition__=#<Thread::ConditionVariable:0x00007f0b26fac4f8>, @set=false, @iteration=0> to be set?.


bin/test test/subscription_adapter/common.rb:74

E

Error:
ClientTest#test_interacting_clients:
ThreadError: queue empty
    <internal:thread_sync>:18:in `pop'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:168:in `read_message'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:241:in `block (2 levels) in test_interacting_clients'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:218:in `block (2 levels) in concurrently'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/concurrent-ruby-1.2.2/lib/concurrent-ruby/concurrent/promises.rb:1583:in `evaluate_to'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/concurrent-ruby-1.2.2/lib/concurrent-ruby/concurrent/promises.rb:1766:in `block in on_resolvable'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/concurrent-ruby-1.2.2/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:352:in `run_task'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/concurrent-ruby-1.2.2/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:343:in `block (3 levels) in create_worker'
    <internal:kernel>:187:in `loop'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/concurrent-ruby-1.2.2/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:334:in `block (2 levels) in create_worker'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/concurrent-ruby-1.2.2/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:333:in `catch'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/concurrent-ruby-1.2.2/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:333:in `block in create_worker'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/concurrent-ruby-1.2.2/lib/concurrent-ruby/concurrent/promises.rb:1258:in `raise'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/concurrent-ruby-1.2.2/lib/concurrent-ruby/concurrent/promises.rb:1258:in `wait_until_resolved!'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/concurrent-ruby-1.2.2/lib/concurrent-ruby/concurrent/promises.rb:988:in `value!'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:218:in `map'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:218:in `concurrently'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:240:in `block in test_interacting_clients'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:90:in `with_puma_server'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:234:in `test_interacting_clients'


bin/test test/client_test.rb:233

E

Error:
ClientTest#test_disappearing_client:
ThreadError: queue empty
    <internal:thread_sync>:18:in `pop'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:168:in `read_message'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:275:in `block in test_disappearing_client'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:90:in `with_puma_server'
    /home/yahonda/src/github.com/rails/rails/actioncable/test/client_test.rb:273:in `test_disappearing_client'


bin/test test/client_test.rb:272

..................

Finished in 1323.812615s, 0.0551 runs/s, 0.3830 assertions/s.
73 runs, 507 assertions, 2 failures, 2 errors, 0 skips
$
```



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