rails sでブラウザーの立ち上げができない。


今までrails s しても表示されていたのに、  
いつの間にかどのリポジトリもrails sで実行してもブラウザー上で表示されなくなりました。  
解決したいです。

rails sで実行できるけど↓

[code]

    > jhon1998@JhonDH talk % rails s
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/2.6.0/net/protocol.rb:66:
    > warning: already initialized constant Net::ProtocRetryError
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:68:
    > warning: previous definition of ProtocRetryError was here
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/2.6.0/net/protocol.rb:206:
    > warning: already initialized constant Net::BufferedIO::BUFSIZE
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:214:
    > warning: previous definition of BUFSIZE was here
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/2.6.0/net/protocol.rb:503:
    > warning: already initialized constant Net::NetPrivate::Socket
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:541:
    > warning: previous definition of Socket was here
    > => Booting Puma
    > => Rails 6.0.6.1 application starting in development 
    > => Run `rails server --help` for more startup options Puma starting in single mode...
    > * Version 3.12.6 (ruby 2.6.5-p114), codename: Llamas in Pajamas
    > * Min threads: 5, max threads: 5
    > * Environment: development
    > * Listening on tcp://localhost:3000 
    Use Ctrl-C to stop
    
    
[/code]

ブラウザーで確認するとアクセスできませんと表示され  
[![画像の説明をここに入力](https://i.stack.imgur.com/lvHES.png)](https://i.stack.imgur.com/lvHES.png)

ターミナルでは以下のような長文が表示され、立ち上がりません。

[code]

    > jhon1998 talk % rails s
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/2.6.0/net/protocol.rb:66:
    > warning: already initialized constant Net::ProtocRetryError
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:68:
    > warning: previous definition of ProtocRetryError was here
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/2.6.0/net/protocol.rb:206:
    > warning: already initialized constant Net::BufferedIO::BUFSIZE
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:214:
    > warning: previous definition of BUFSIZE was here
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/2.6.0/net/protocol.rb:503:
    > warning: already initialized constant Net::NetPrivate::Socket
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:541:
    > warning: previous definition of Socket was here
    > => Booting Puma
    > => Rails 6.0.6.1 application starting in development 
    > => Run `rails server --help` for more startup options Puma starting in single mode...
    > * Version 3.12.6 (ruby 2.6.5-p114), codename: Llamas in Pajamas
    > * Min threads: 5, max threads: 5
    > * Environment: development
    > * Listening on tcp://localhost:3000 Use Ctrl-C to stop Started GET "/" for ::1 at 2023-09-22 22:41:30 +0900
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mysql2-0.5.5/lib/mysql2/client.rb:97:
    > [BUG] Segmentation fault at 0x0000000000000000 ruby 2.6.5p114
    > (2019-10-01 revision 67812) [x86_64-darwin22]
    > 
    > -- Crash Report log information --------------------------------------------    See Crash Report log file under the one of following:                    
    >      * ~/Library/Logs/DiagnosticReports                                     
    >      * /Library/Logs/DiagnosticReports                                          for more details.                                                     
    > Don't forget to include the above Crash Report log file in bug
    > reports.     
    > 
    > -- Control frame information ----------------------------------------------- c:0050 p:---- s:0367 e:000366 CFUNC  :connect c:0049 p:0674 s:0355 e:000354 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mysql2-0.5.5/lib/mysql2/client.rb:97
    > [FINISH] c:0048 p:---- s:0340 e:000339 CFUNC  :new c:0047 p:0104
    > s:0335 e:000334 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/mysql
    > c:0046 p:0024 s:0328 e:000327 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstr
    > c:0045 p:0021 s:0324 e:000323 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstr
    > c:0044 p:0016 s:0320 e:000319 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstr
    > c:0043 p:0014 s:0314 e:000313 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstr
    > c:0042 p:0012 s:0308 e:000306 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstr
    > c:0041 p:0025 s:0302 e:000298 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstr
    > c:0040 p:0138 s:0295 e:000294 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstr
    > c:0039 p:0011 s:0289 e:000288 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_handling.rb:22
    > c:0038 p:0004 s:0285 e:000284 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_handling.rb:18
    > c:0037 p:0012 s:0281 e:000280 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/migration.rb:562
    > c:0036 p:0009 s:0275 e:000274 BLOCK 
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/callbacks.rb:2
    > c:0035 p:0029 s:0272 e:000271 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/callbacks.rb:101
    > c:0034 p:0010 s:0263 e:000262 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/callbacks.rb:2
    > c:0033 p:0018 s:0256 e:000255 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/executor.rb:14
    > c:0032 p:0032 s:0248 e:000247 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/actionable_exc
    > c:0031 p:0024 s:0242 e:000241 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/debug_exceptio
    > c:0030 p:0008 s:0231 e:000230 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/web-console-4.2.0/lib/web_console/middleware.rb:132
    > c:0029 p:0077 s:0225 e:000224 BLOCK 
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/web-console-4.2.0/lib/web_console/middleware.rb:28
    > [FINISH] c:0028 p:---- s:0215 e:000214 CFUNC  :catch c:0027 p:0007
    > s:0210 e:000209 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/web-console-4.2.0/lib/web_console/middleware.rb:17
    > c:0026 p:0024 s:0203 e:000202 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/show_exception
    > c:0025 p:0042 s:0196 E:001f10 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/railties-6.0.6.1/lib/rails/rack/logger.rb:37
    > c:0024 p:0009 s:0186 e:000185 BLOCK 
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/railties-6.0.6.1/lib/rails/rack/logger.rb:26
    > c:0023 p:0004 s:0183 e:000182 BLOCK 
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/tagged_logging.rb:80 c:0022 p:0013 s:0180 e:000179 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/tagged_logging.rb:28 c:0021 p:0012 s:0174 e:000173 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/tagged_logging.rb:80 c:0020 p:0041 s:0169 e:000168 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/railties-6.0.6.1/lib/rails/rack/logger.rb:26
    > c:0019 p:0041 s:0163 e:000162 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/sprockets-rails-3.4.2/lib/sprockets/rails/quiet_assets.rb:13
    > c:0018 p:0053 s:0158 e:000157 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/remote_ip.rb:8
    > c:0017 p:0039 s:0152 e:000151 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/request_id.rb:
    > c:0016 p:0091 s:0146 e:000145 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/rack-2.2.7/lib/rack/method_override.rb:24 c:0015 p:0020 s:0140 e:000139 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/rack-2.2.7/lib/rack/runtime.rb:22
    > c:0014 p:0033 s:0130 e:000129 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/cache/strategy/local_ca
    > c:0013 p:0018 s:0123 e:000122 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/executor.rb:14
    > c:0012 p:0083 s:0115 e:000114 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/static.rb:126
    > c:0011 p:0008 s:0107 e:000106 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/rack-2.2.7/lib/rack/sendfile.rb:110
    > c:0010 p:0054 s:0095 e:000094 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/host_authoriza
    > c:0009 p:0149 s:0089 e:000088 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/webpacker-4.3.0/lib/webpacker/dev_server_proxy.rb:23
    > c:0008 p:0011 s:0084 e:000082 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/rack-proxy-0.7.6/lib/rack/proxy.rb:87
    > c:0007 p:0020 s:0078 e:000077 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/railties-6.0.6.1/lib/rails/engine.rb:527
    > c:0006 p:0026 s:0072 e:000071 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.6/lib/puma/configuration.rb:227 c:0005 p:0293 s:0067 e:000066 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.6/lib/puma/server.rb:706
    > c:0004 p:0029 s:0040 e:000039 METHOD
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.6/lib/puma/server.rb:476
    > c:0003 p:0065 s:0026 e:000025 BLOCK 
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.6/lib/puma/server.rb:334
    > c:0002 p:0127 s:0016 e:000015 BLOCK 
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.6/lib/puma/thread_pool.rb:135 [FINISH] c:0001 p:---- s:0003 e:000002 (none) [FINISH]
    > 
    > -- Ruby level backtrace information ---------------------------------------- /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.6/lib/puma/thread_pool.rb:135:in
    > `block in spawn_thread'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.6/lib/puma/server.rb:334:in
    > `block in run'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.6/lib/puma/server.rb:476:in
    > `process_client'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.6/lib/puma/server.rb:706:in
    > `handle_request'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.6/lib/puma/configuration.rb:227:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/railties-6.0.6.1/lib/rails/engine.rb:527:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/rack-proxy-0.7.6/lib/rack/proxy.rb:87:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/webpacker-4.3.0/lib/webpacker/dev_server_proxy.rb:23:in
    > `perform_request'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/host_authorization.rb:103:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/rack-2.2.7/lib/rack/sendfile.rb:110:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/static.rb:126:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/executor.rb:14:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/cache/strategy/local_cache_middleware.rb:29:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/rack-2.2.7/lib/rack/runtime.rb:22:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/rack-2.2.7/lib/rack/method_override.rb:24:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/request_id.rb:27:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/remote_ip.rb:81:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/sprockets-rails-3.4.2/lib/sprockets/rails/quiet_assets.rb:13:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/railties-6.0.6.1/lib/rails/rack/logger.rb:26:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/tagged_logging.rb:80:in
    > `tagged'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/tagged_logging.rb:28:in
    > `tagged'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/tagged_logging.rb:80:in
    > `block in tagged'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/railties-6.0.6.1/lib/rails/rack/logger.rb:26:in
    > `block in call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/railties-6.0.6.1/lib/rails/rack/logger.rb:37:in
    > `call_app'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/show_exceptions.rb:33:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/web-console-4.2.0/lib/web_console/middleware.rb:17:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/web-console-4.2.0/lib/web_console/middleware.rb:17:in
    > `catch'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/web-console-4.2.0/lib/web_console/middleware.rb:28:in
    > `block in call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/web-console-4.2.0/lib/web_console/middleware.rb:132:in
    > `call_app'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/debug_exceptions.rb:32:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/actionable_exceptions.rb:18:in `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/executor.rb:14:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/callbacks.rb:26:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/callbacks.rb:101:in
    > `run_callbacks'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/actionpack-6.0.6.1/lib/action_dispatch/middleware/callbacks.rb:27:in
    > `block in call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/migration.rb:562:in
    > `call'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_handling.rb:189:in
    > `connection'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_handling.rb:221:in
    > `retrieve_connection'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:1125:in
    > `retrieve_connection'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:437:in
    > `connection'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:593:in
    > `checkout'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:871:in
    > `acquire_connection'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:910:in
    > `try_to_checkout_new_connection'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:931:in
    > `checkout_new_connection'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:887:in
    > `new_connection'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/mysql2_adapter.rb:24:in `mysql2_connection'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-6.0.6.1/lib/active_record/connection_adapters/mysql2_adapter.rb:24:in `new'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mysql2-0.5.5/lib/mysql2/client.rb:97:in `initialize'
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mysql2-0.5.5/lib/mysql2/client.rb:97:in `connect'
    > 
    > -- Machine register context ------------------------------------------------  rax: 0x000000010d520045 rbx: 0x0000000000000001 rcx: 0x000000010d520ba4 
    > rdx: 0x0000000000000000 rdi: 0x00007fca9b2f3a00 rsi:
    > 0x0000000000000020  rbp: 0x0000000309f85ea0 rsp: 0x0000000309f859a0 
    > r8: 0x0000000000000001   r9: 0x00007fca7b834148 r10:
    > 0x000000010c4dc8a0 r11: 0x00007fca9b32c6d0  r12: 0x00007fca7b33ee88
    > r13: 0x0000000000000008 r14: 0x00006000006f77b0  r15:
    > 0x00007fca91517548 rip: 0x000000010d520045 rfl: 0x0000000000000203
    > 
    > -- C level backtrace information ------------------------------------------- /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(rb_vm_bugreport+0x82)
    > [0x10b3a4ae2]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(rb_bug_context+0x1d8)
    > [0x10b214af8]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(sigsegv+0x51)
    > [0x10b315fd1] /usr/lib/system/libsystem_platform.dylib(_sigtramp+0x1d)
    > [0x7ff8127645ed]
    > /usr/local/Cellar/mysql/8.1.0/lib/libmysqlclient.22.dylib(mysql_options+0x58f)
    > [0x10d520045]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mysql2-0.5.5/lib/mysql2/mysql2.bundle(rb_mysql_connect+0x1af) [0x10c4dca4f]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(call_cfunc_8+0x3d)
    > [0x10b39ef7d]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(vm_call_cfunc+0x14f)
    > [0x10b39914f]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(vm_exec_core+0x2cf5)
    > [0x10b3822c5]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(rb_vm_exec+0x995)
    > [0x10b394505]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(rb_funcallv+0xfb)
    > [0x10b38aacb]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(rb_class_s_new+0x29)
    > [0x10b298219]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(vm_call_cfunc+0x14f)
    > [0x10b39914f]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(vm_exec_core+0x2cf5)
    > [0x10b3822c5]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(rb_vm_exec+0x995)
    > [0x10b394505]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(catch_i+0x5e)
    > [0x10b3a0d8e]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(vm_catch_protect+0xd7)
    > [0x10b390857]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(rb_f_catch+0x57)
    > [0x10b391067]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(vm_call_cfunc+0x14f)
    > [0x10b39914f]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(vm_exec_core+0x2ad9)
    > [0x10b3820a9]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(rb_vm_exec+0x995)
    > [0x10b394505]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(thread_do_start+0x2ab)
    > [0x10b35a54b]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(thread_start_func_2+0x1fd)
    > [0x10b35a03d]
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/libruby.2.6.dylib(thread_start_func_1+0x125)
    > [0x10b359c85]
    > /usr/lib/system/libsystem_pthread.dylib(_pthread_start+0x7d)
    > [0x7ff8127371d3]
    > 
    > -- Other runtime information -----------------------------------------------
    > 
    > * Loaded script: bin/rails
    > 
    > * Loaded features:
    > 
    >     0 enumerator.so
    >     1 thread.rb
    >     2 rational.so
    >     3 complex.so
    >     4 /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin22/enc/encdb.bundle
    >     5 /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin22/enc/trans/transdb.bundle
    >     6 /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin22/rbconfig.rb
    >     7 /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/compatibility.rb
    >     8 /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/defaults.rb
    >     9 /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/deprecate.rb
    > 10
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/errors.rb
    > 11
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/unknown_command_spell_checker.rb    12
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/exceptions.rb
    > 13
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/basic_specification.rb
    
    > 2367
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-6.0.6.1/lib/active_support/current_attributes.rb
    > 2368
    > /Users/jhon1998/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/web-console-4.2.0/lib/web_console/whiny_request.rb
    > 
    > [NOTE] You may have encountered a bug in the Ruby interpreter or
    > extension libraries. Bug reports are welcome. For details:
    > https://www.ruby-lang.org/bugreport.html
    > 
    > [IMPORTANT] Don't forget to include the Crash Report log file under
    > DiagnosticReports directory in bug reports.
    > 
    > zsh: abort      rails s 
    
[/code]

rubyやrailsの再インストールを行なってもダメでした。  
他に方法はありませんか？  
よろしくお願いします。




>
[code]

>     > [BUG] Segmentation fault at 0x0000000000000000 ruby 2.6.5p114
>  
[/code]

上記のメッセージはCレベルで致命的なエラーが発生したと事を示します。これが発生するのは、Ruby本体、または、Cで書かれた拡張ライブラリ(今回はmysql2)のどちらかにバグがあることを示します。また、Ruby本体と拡張ライブラリのどちらかのバージョンが古い場合、未対応な組合せであるために発生することもあります。

ほとんどの場合、このようなバグは既に報告され、最新バージョンでは修正されています。全てを最新バージョンにすることで問題は解決する可能性が高いです。もし、全てを最新バージョンにしてもエラーになるようであれば、Ruby本体か拡張ライブラリのバグの可能性が高いため、開発側にバグを報告して、修正を依頼することになります。

さて、現在の状況は、エラーメッセージから見る限り次のバージョンと思われます。

  * Ruby 2.6.5 (2.6系は既にサポート終了)
  * Ralis 6.0.6.1 (6.0系は既にサポート終了)
  * mysql2 0.5.5 (最新)

Ruby
2.6系の最新バージョンである2.6.10にすることで発生しなくなる可能性もありますが、既にサポートが終了しており、なおらない可能性もあります。また、mysql2側が新しすぎてサポート切れのRuby
2.6系に対応していない可能性もあり、バージョンを落とせば、発生しなくなる可能性もあります。ただ、これらはあくまでもなんとか動かすための方法であり、サポートされているバージョンにアップデート、つまり、Rubyは3.0系以上、Railsは6.1系以上にあげないと、どこかでまた同じ問題が出る可能性があります。

まとめると、次のような流れになるかと思います。

  1. Rubyを2.6.10に上げてみる。
  2. 1.でうまくいかないなら、mysql2のバージョンを一つ一つ落としていく。(Gemfileでバージョン指定する)
  3. どちらにしても、最終的には、Rubyを3.0系以上、Railsを6.1系以上にアップデートする。(mysql2は最新バージョンに戻す)

最初の1.と2.ではどうしても動かない場合は、mysql2で発生しているバグなので、データベースはsqlit3にすることで動作確認を行うようにした状態で3.を実施するしか無いかと思います。3.の状態にしても発生するというのであれば、バグを持っている可能性が高いmysql2の[issues](https://github.com/brianmario/mysql2/issues)にバグ報告をしてください。




>
[code]

>     > [BUG] Segmentation fault at 0x0000000000000000 ruby 2.6.5p114
>  
[/code]

上記のメッセージはCレベルで致命的なエラーが発生したと事を示します。これが発生するのは、Ruby本体、または、Cで書かれた拡張ライブラリ(今回はmysql2)のどちらかにバグがあることを示します。また、Ruby本体と拡張ライブラリのどちらかのバージョンが古い場合、未対応な組合せであるために発生することもあります。

ほとんどの場合、このようなバグは既に報告され、最新バージョンでは修正されています。全てを最新バージョンにすることで問題は解決する可能性が高いです。もし、全てを最新バージョンにしてもエラーになるようであれば、Ruby本体か拡張ライブラリのバグの可能性が高いため、開発側にバグを報告して、修正を依頼することになります。

さて、現在の状況は、エラーメッセージから見る限り次のバージョンと思われます。

  * Ruby 2.6.5 (2.6系は既にサポート終了)
  * Ralis 6.0.6.1 (6.0系は既にサポート終了)
  * mysql2 0.5.5 (最新)

Ruby
2.6系の最新バージョンである2.6.10にすることで発生しなくなる可能性もありますが、既にサポートが終了しており、なおらない可能性もあります。また、mysql2側が新しすぎてサポート切れのRuby
2.6系に対応していない可能性もあり、バージョンを落とせば、発生しなくなる可能性もあります。ただ、これらはあくまでもなんとか動かすための方法であり、サポートされているバージョンにアップデート、つまり、Rubyは3.0系以上、Railsは6.1系以上にあげないと、どこかでまた同じ問題が出る可能性があります。

まとめると、次のような流れになるかと思います。

  1. Rubyを2.6.10に上げてみる。
  2. 1.でうまくいかないなら、mysql2のバージョンを一つ一つ落としていく。(Gemfileでバージョン指定する)
  3. どちらにしても、最終的には、Rubyを3.0系以上、Railsを6.1系以上にアップデートする。(mysql2は最新バージョンに戻す)

最初の1.と2.ではどうしても動かない場合は、mysql2で発生しているバグなので、データベースはsqlit3にすることで動作確認を行うようにした状態で3.を実施するしか無いかと思います。3.の状態にしても発生するというのであれば、バグを持っている可能性が高いmysql2の[issues](https://github.com/brianmario/mysql2/issues)にバグ報告をしてください。

