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Bug #14662

Updated by nobu (Nobuyoshi Nakada) about 6 years ago

We've been trying to upgrade an app to Ruby 2.5 and are seeing interpreter crashes with `Stack consistency error` messages on both 2.5.0 and 2.5.1 when running our RSpec test suite. I've spent several days trying to pin this down but haven't been able to yet--it seems to happen nondeterministically about 10% of the time. I have not been able to produce these crashes on Ruby 2.4.4 or earlier (but because they're nondeterministic, it's possible I just got unlucky). 

 Because we randomize our test ordering, stack traces for the crashes have occurred in a handful of different places in gems we depend on, but if we run the tests in the same order (using pinned seeds) the crashes--when they occur, which is not every time, even with a pinned seed--will *usually* give the same stack trace. 

 The stack traces we've seen have pointed us to these lines in these versions of these gems: 

 https://github.com/jeremyevans/sequel/blob/d9104d2cf0611f749a16fe93c4171a1147dfd4b2/lib/sequel/dataset/query.rb#L1257 

 https://github.com/rails/rails/blob/813af4655f9bf3c712cf50205eebd337070cee52/activesupport/lib/active_support/ordered_options.rb#L52 

 https://github.com/rails/rails/blob/813af4655f9bf3c712cf50205eebd337070cee52/activesupport/lib/active_support/log_subscriber.rb#L109 

 https://github.com/rails/sprockets/blob/10dada6c30016ca89662c0aa48591f071b069420/lib/sprockets/mime.rb#L122 

 https://github.com/rspec/rspec-core/blob/3bef84bf4cce96a4417a6550d39f53390ec81439/lib/rspec/core/example_group.rb#L52 

 https://github.com/rails/rails/blob/813af4655f9bf3c712cf50205eebd337070cee52/activesupport/lib/active_support/notifications/instrumenter.rb#L80 

 In trying to pin this down, I've been able to reproduce with some regularity with a subset of around 100 of our tests, but not fewer. I don't know what about running all those tests triggers it -- some combination of code, or a garbage collection or timing issue. Based on which tests run (lots of complex behavior involving Queue and WeakRef) I suspected the issue might be related to https://bugs.ruby-lang.org/issues/13552, but when I checked out Ruby's git version 79d99551801812f2513dacc73b6dea716cc07096 (right before the changes for #13552), the crash--or a similar Stack consistency error--still occurred. 

 As I mentioned, the core dumps/stack traces vary but here's one of them from Ruby 2.5.1 (I'm happy to provide more if that's helpful): 

 ~~~ 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:122: [BUG] Stack consistency error (sp: 960, bp: 959) 
 ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux] 

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 c:0007 p:0019 s:0034 e:000033 METHOD /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:87 
 c:0006 p:0072 s:0028 e:000027 METHOD /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:71 
 c:0005 p:0020 s:0020 e:000019 METHOD /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:45 
 c:0004 p:0021 s:0015 e:000014 TOP      /bundle/gems/rspec-core-3.6.0/exe/rspec:4 [FINISH] 
 c:0003 p:---- s:0012 e:000011 CFUNC    :load 
 c:0002 p:0159 s:0007 E:001bb8 EVAL     /usr/local/bundle/bin/rspec:29 [FINISH] 
 c:0001 p:0000 s:0003 E:001e00 (none) [FINISH] 

 -- Ruby level backtrace information ---------------------------------------- 
 /usr/local/bundle/bin/rspec:29:in `<main>' 
 /usr/local/bundle/bin/rspec:29:in `load' 
 /bundle/gems/rspec-core-3.6.0/exe/rspec:4:in `<top (required)>' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:45:in `invoke' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:71:in `run' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:87:in `run' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:112:in `run_specs' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/reporter.rb:79:in `report' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:113:in `block in run_specs' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/configuration.rb:1894:in `with_suite_hooks' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:118:in `block (2 levels) in run_specs' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:118:in `map' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/runner.rb:118:in `block (3 levels) in run_specs' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example_group.rb:590:in `run' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example_group.rb:590:in `map' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example_group.rb:590:in `block in run' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example_group.rb:589:in `run' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example_group.rb:623:in `run_examples' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example_group.rb:623:in `map' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example_group.rb:627:in `block in run_examples' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:251:in `run' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:500:in `with_around_and_singleton_context_hooks' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:457:in `with_around_example_hooks' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/hooks.rb:464:in `run' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/hooks.rb:607:in `run_around_example_hooks_for' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:342:in `call' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/hooks.rb:606:in `block (2 levels) in run_around_example_hooks_for' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/hooks.rb:375:in `execute_with' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:447:in `instance_exec' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:447:in `instance_exec' 
 /app/spec/rails_helper.rb:69:in `block (2 levels) in <top (required)>' 
 /bundle/gems/sequel-4.49.0/lib/sequel/database/transactions.rb:165:in `transaction' 
 /bundle/gems/sequel-4.49.0/lib/sequel/database/connecting.rb:301:in `synchronize' 
 /bundle/gems/sequel-4.49.0/lib/sequel/connection_pool/threaded.rb:107:in `hold' 
 /bundle/gems/sequel-4.49.0/lib/sequel/database/connecting.rb:301:in `block in synchronize' 
 /bundle/gems/sequel-4.49.0/lib/sequel/database/transactions.rb:199:in `block in transaction' 
 /bundle/gems/sequel-4.49.0/lib/sequel/database/transactions.rb:217:in `_transaction' 
 /app/spec/rails_helper.rb:69:in `block (3 levels) in <top (required)>' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:342:in `call' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/hooks.rb:606:in `block (2 levels) in run_around_example_hooks_for' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/hooks.rb:375:in `execute_with' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:447:in `instance_exec' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:447:in `instance_exec' 
 /bundle/gems/rspec-rails-3.6.1/lib/rspec/rails/adapters.rb:127:in `block (2 levels) in <module:MinitestLifecycleAdapter>' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:342:in `call' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/hooks.rb:606:in `block (2 levels) in run_around_example_hooks_for' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/hooks.rb:375:in `execute_with' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:447:in `instance_exec' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:447:in `instance_exec' 
 /bundle/gems/rspec-rails-3.6.1/lib/rspec/rails/example/controller_example_group.rb:191:in `block (2 levels) in <module:ControllerExampleGroup>' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:342:in `call' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/hooks.rb:604:in `block in run_around_example_hooks_for' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/hooks.rb:464:in `block in run' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:457:in `block in with_around_example_hooks' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:500:in `block in with_around_and_singleton_context_hooks' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:254:in `block in run' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/example.rb:254:in `instance_exec' 
 /app/spec/controllers/stylist_controller_spec.rb:9:in `block (3 levels) in <top (required)>' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/memoized_helpers.rb:119:in `is_expected' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/memoized_helpers.rb:298:in `block in let' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/memoized_helpers.rb:155:in `fetch_or_store' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/memoized_helpers.rb:155:in `fetch' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/memoized_helpers.rb:156:in `block in fetch_or_store' 
 /bundle/gems/rspec-support-3.6.0/lib/rspec/support/reentrant_mutex.rb:23:in `synchronize' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/memoized_helpers.rb:157:in `block (2 levels) in fetch_or_store' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/memoized_helpers.rb:157:in `fetch' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/memoized_helpers.rb:157:in `block (3 levels) in fetch_or_store' 
 /bundle/gems/rspec-core-3.6.0/lib/rspec/core/memoized_helpers.rb:298:in `block (2 levels) in let' 
 /app/spec/controllers/stylist_controller_spec.rb:5:in `block (3 levels) in <top (required)>' 
 /bundle/gems/rails-controller-testing-0.1.1/lib/rails/controller/testing/integration.rb:12:in `block (2 levels) in <module:Integration>' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/test_case.rb:392:in `get' 
 /bundle/gems/gon-6.1.0/lib/gon/spec_helpers.rb:15:in `process' 
 /bundle/gems/devise-4.4.1/lib/devise/test/controller_helpers.rb:35:in `process' 
 /bundle/gems/devise-4.4.1/lib/devise/test/controller_helpers.rb:102:in `_catch_warden' 
 /bundle/gems/devise-4.4.1/lib/devise/test/controller_helpers.rb:102:in `catch' 
 /bundle/gems/devise-4.4.1/lib/devise/test/controller_helpers.rb:35:in `block in process' 
 /bundle/gems/rails-controller-testing-0.1.1/lib/rails/controller/testing/template_assertions.rb:61:in `process' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/test_case.rb:513:in `process' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal.rb:189:in `dispatch' 
 /bundle/gems/rack-mini-profiler-0.10.5/lib/mini_profiler/profiling_methods.rb:76:in `block in profile_method' 
 /bundle/gems/actionview-5.1.4/lib/action_view/rendering.rb:30:in `process' 
 /bundle/gems/actionpack-5.1.4/lib/abstract_controller/base.rb:124:in `process' 
 /bundle/gems/sequel-rails-0.9.17/lib/sequel_rails/railties/controller_runtime.rb:18:in `process_action' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/params_wrapper.rb:252:in `process_action' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/notifications.rb:166:in `instrument' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/notifications.rb:166:in `block in instrument' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/rescue.rb:20:in `process_action' 
 /bundle/gems/actionpack-5.1.4/lib/abstract_controller/callbacks.rb:19:in `process_action' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/callbacks.rb:131:in `run_callbacks' 
 /bundle/gems/actionpack-5.1.4/lib/abstract_controller/callbacks.rb:20:in `block in process_action' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/rendering.rb:30:in `process_action' 
 /bundle/gems/actionpack-5.1.4/lib/abstract_controller/base.rb:186:in `process_action' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action' 
 /app/app/controllers/stylist_controller.rb:3:in `index' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/instrumentation.rb:43:in `render' 
 /bundle/gems/sequel-rails-0.9.17/lib/sequel_rails/railties/controller_runtime.rb:24:in `cleanup_view_runtime' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/instrumentation.rb:87:in `cleanup_view_runtime' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/instrumentation.rb:44:in `block in render' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/core_ext/benchmark.rb:12:in `ms' 
 /usr/local/lib/ruby/2.5.0/benchmark.rb:308:in `realtime' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/core_ext/benchmark.rb:12:in `block in ms' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/instrumentation.rb:44:in `block (2 levels) in render' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/rendering.rb:36:in `render' 
 /bundle/gems/actionpack-5.1.4/lib/abstract_controller/rendering.rb:24:in `render' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/renderers.rb:141:in `render_to_body' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/rendering.rb:52:in `render_to_body' 
 /bundle/gems/actionview-5.1.4/lib/action_view/rendering.rb:83:in `render_to_body' 
 /bundle/gems/actionpack-5.1.4/lib/action_controller/metal/streaming.rb:217:in `_render_template' 
 /bundle/gems/actionview-5.1.4/lib/action_view/rendering.rb:103:in `_render_template' 
 /bundle/gems/actionview-5.1.4/lib/action_view/renderer/renderer.rb:23:in `render' 
 /bundle/gems/actionview-5.1.4/lib/action_view/renderer/renderer.rb:42:in `render_template' 
 /bundle/gems/actionview-5.1.4/lib/action_view/renderer/template_renderer.rb:14:in `render' 
 /bundle/gems/actionview-5.1.4/lib/action_view/renderer/template_renderer.rb:50:in `render_template' 
 /bundle/gems/actionview-5.1.4/lib/action_view/renderer/template_renderer.rb:59:in `render_with_layout' 
 /bundle/gems/actionview-5.1.4/lib/action_view/renderer/template_renderer.rb:51:in `block in render_template' 
 /bundle/gems/actionview-5.1.4/lib/action_view/renderer/abstract_renderer.rb:41:in `instrument' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/notifications.rb:166:in `instrument' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/notifications.rb:166:in `block in instrument' 
 /bundle/gems/actionview-5.1.4/lib/action_view/renderer/abstract_renderer.rb:42:in `block in instrument' 
 /bundle/gems/actionview-5.1.4/lib/action_view/renderer/template_renderer.rb:52:in `block (2 levels) in render_template' 
 /bundle/gems/rack-mini-profiler-0.10.5/lib/mini_profiler/profiling_methods.rb:76:in `block in profile_method' 
 /bundle/gems/actionview-5.1.4/lib/action_view/template.rb:155:in `render' 
 /bundle/gems/actionview-5.1.4/lib/action_view/template.rb:352:in `instrument_render_template' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/notifications.rb:166:in `instrument' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
 /bundle/gems/activesupport-5.1.4/lib/active_support/notifications.rb:166:in `block in instrument' 
 /bundle/gems/actionview-5.1.4/lib/action_view/template.rb:157:in `block in render' 
 /app/app/views/stylist/index.html.erb:7:in `_app_views_stylist_index_html_erb___2126748772640857676_46918720390060' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:183:in `stylesheet_link_tag' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:183:in `map' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:185:in `block in stylesheet_link_tag' 
 /bundle/gems/actionview-5.1.4/lib/action_view/helpers/asset_tag_helper.rb:114:in `stylesheet_link_tag' 
 /bundle/gems/actionview-5.1.4/lib/action_view/helpers/asset_tag_helper.rb:114:in `map' 
 /bundle/gems/actionview-5.1.4/lib/action_view/helpers/asset_tag_helper.rb:118:in `block in stylesheet_link_tag' 
 /bundle/gems/actionview-5.1.4/lib/action_view/helpers/asset_url_helper.rb:343:in `stylesheet_path' 
 /bundle/gems/actionview-5.1.4/lib/action_view/helpers/asset_url_helper.rb:198:in `asset_path' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:79:in `compute_asset_path' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:101:in `resolve_asset_path' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:241:in `resolve_asset' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:241:in `detect' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:241:in `each' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:242:in `block in resolve_asset' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:102:in `block in resolve_asset_path' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:325:in `asset_path' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:336:in `digest_path' 
 /bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/helper.rb:355:in `find_asset' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/base.rb:92:in `[]' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/base.rb:64:in `find_asset' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:66:in `resolve_with_compat' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/resolve.rb:35:in `resolve' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/resolve.rb:105:in `resolve_logical_path' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/resolve.rb:201:in `parse_path_extnames' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:108:in `extname_map' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:114:in `compute_extname_map' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:114:in `each' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:116:in `block in compute_extname_map' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:116:in `each' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:117:in `block (2 levels) in compute_extname_map' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:117:in `times' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:118:in `block (3 levels) in compute_extname_map' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:118:in `each' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:118:in `permutation' 
 /bundle/gems/sprockets-3.7.1/lib/sprockets/mime.rb:122:in `block (4 levels) in compute_extname_map' 

 -- C level backtrace information ------------------------------------------- 
 /usr/local/lib/libruby.so.2.5(rb_vm_bugreport+0xc29) [0x7f8a2bdae959] 
 /usr/local/lib/libruby.so.2.5(rb_bug+0xd3) [0x7f8a2bc29723] 
 /usr/local/lib/libruby.so.2.5(0x220798) [0x7f8a2bd9f798] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(0x329fa) [0x7f8a2bbb19fa] 
 /usr/local/lib/libruby.so.2.5(0x340e9) [0x7f8a2bbb30e9] 
 /usr/local/lib/libruby.so.2.5(0x2256d3) [0x7f8a2bda46d3] 
 /usr/local/lib/libruby.so.2.5(0x225f51) [0x7f8a2bda4f51] 
 /usr/local/lib/libruby.so.2.5(0x226c91) [0x7f8a2bda5c91] 
 /usr/local/lib/libruby.so.2.5(0x213bb2) [0x7f8a2bd92bb2] 
 /usr/local/lib/libruby.so.2.5(rb_block_call+0x2b) [0x7f8a2bd92d5b] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(0x22285a) [0x7f8a2bda185a] 
 /usr/local/lib/libruby.so.2.5(0x10ed60) [0x7f8a2bc8dd60] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(rb_ary_each+0x3c) [0x7f8a2bbaefac] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(rb_ary_each+0x3c) [0x7f8a2bbaefac] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(0xa2278) [0x7f8a2bc21278] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0x1b7) [0x7f8a2bda0f97] 
 /usr/local/lib/libruby.so.2.5(rb_ary_each+0x3c) [0x7f8a2bbaefac] 
 /usr/local/lib/libruby.so.2.5(0x2256d3) [0x7f8a2bda46d3] 
 /usr/local/lib/libruby.so.2.5(0x225f51) [0x7f8a2bda4f51] 
 /usr/local/lib/libruby.so.2.5(0x226c91) [0x7f8a2bda5c91] 
 /usr/local/lib/libruby.so.2.5(0x213bb2) [0x7f8a2bd92bb2] 
 /usr/local/lib/libruby.so.2.5(rb_block_call+0x2b) [0x7f8a2bd92d5b] 
 /usr/local/lib/libruby.so.2.5(0x9ac5f) [0x7f8a2bc19c5f] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(0x3573c) [0x7f8a2bbb473c] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(0x3573c) [0x7f8a2bbb473c] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x221324) [0x7f8a2bda0324] 
 /usr/local/lib/libruby.so.2.5(0x2215d9) [0x7f8a2bda05d9] 
 /usr/local/lib/libruby.so.2.5(0x2238b2) [0x7f8a2bda28b2] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x221324) [0x7f8a2bda0324] 
 /usr/local/lib/libruby.so.2.5(0x2215d9) [0x7f8a2bda05d9] 
 /usr/local/lib/libruby.so.2.5(0x2238b2) [0x7f8a2bda28b2] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c549) [0x7f8a2bd9b549] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(0x222a3a) [0x7f8a2bda1a3a] 
 /usr/local/lib/libruby.so.2.5(0x213ea1) [0x7f8a2bd92ea1] 
 /usr/local/lib/libruby.so.2.5(rb_catch_obj+0x1c) [0x7f8a2bd92fec] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x221324) [0x7f8a2bda0324] 
 /usr/local/lib/libruby.so.2.5(0x2215d9) [0x7f8a2bda05d9] 
 /usr/local/lib/libruby.so.2.5(0x2238b2) [0x7f8a2bda28b2] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c549) [0x7f8a2bd9b549] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x221324) [0x7f8a2bda0324] 
 /usr/local/lib/libruby.so.2.5(0x2215d9) [0x7f8a2bda05d9] 
 /usr/local/lib/libruby.so.2.5(0x2238b2) [0x7f8a2bda28b2] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c6e6) [0x7f8a2bd9b6e6] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(0xd0d58) [0x7f8a2bc4fd58] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(0xd0d58) [0x7f8a2bc4fd58] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x221324) [0x7f8a2bda0324] 
 /usr/local/lib/libruby.so.2.5(0x2215d9) [0x7f8a2bda05d9] 
 /usr/local/lib/libruby.so.2.5(0x2238b2) [0x7f8a2bda28b2] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c549) [0x7f8a2bd9b549] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(0x221cad) [0x7f8a2bda0cad] 
 /usr/local/lib/libruby.so.2.5(0x2221e0) [0x7f8a2bda11e0] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(0x221954) [0x7f8a2bda0954] 
 /usr/local/lib/libruby.so.2.5(0x221a59) [0x7f8a2bda0a59] 
 /usr/local/lib/libruby.so.2.5(0x221bd2) [0x7f8a2bda0bd2] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(0x221cad) [0x7f8a2bda0cad] 
 /usr/local/lib/libruby.so.2.5(0x2221e0) [0x7f8a2bda11e0] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(0x221954) [0x7f8a2bda0954] 
 /usr/local/lib/libruby.so.2.5(0x221a59) [0x7f8a2bda0a59] 
 /usr/local/lib/libruby.so.2.5(0x221bd2) [0x7f8a2bda0bd2] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(0x221cad) [0x7f8a2bda0cad] 
 /usr/local/lib/libruby.so.2.5(0x2221e0) [0x7f8a2bda11e0] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(0x221954) [0x7f8a2bda0954] 
 /usr/local/lib/libruby.so.2.5(0x221a59) [0x7f8a2bda0a59] 
 /usr/local/lib/libruby.so.2.5(0x221bd2) [0x7f8a2bda0bd2] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(0x221cad) [0x7f8a2bda0cad] 
 /usr/local/lib/libruby.so.2.5(0x2221e0) [0x7f8a2bda11e0] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(0x221954) [0x7f8a2bda0954] 
 /usr/local/lib/libruby.so.2.5(0x221a59) [0x7f8a2bda0a59] 
 /usr/local/lib/libruby.so.2.5(0x221bd2) [0x7f8a2bda0bd2] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(0x3573c) [0x7f8a2bbb473c] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(0x3573c) [0x7f8a2bbb473c] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0x2217bc) [0x7f8a2bda07bc] 
 /usr/local/lib/libruby.so.2.5(rb_yield+0xca) [0x7f8a2bda0eaa] 
 /usr/local/lib/libruby.so.2.5(0x3573c) [0x7f8a2bbb473c] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c2f8) [0x7f8a2bd9b2f8] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0xf89f4) [0x7f8a2bc779f4] 
 /usr/local/lib/libruby.so.2.5(0xf90eb) [0x7f8a2bc780eb] 
 /usr/local/lib/libruby.so.2.5(0x210bef) [0x7f8a2bd8fbef] 
 /usr/local/lib/libruby.so.2.5(0x223fb3) [0x7f8a2bda2fb3] 
 /usr/local/lib/libruby.so.2.5(0x21c549) [0x7f8a2bd9b549] 
 /usr/local/lib/libruby.so.2.5(0x220a80) [0x7f8a2bd9fa80] 
 /usr/local/lib/libruby.so.2.5(0xb0da7) [0x7f8a2bc2fda7] 
 /usr/local/lib/libruby.so.2.5(ruby_exec_node+0x1d) [0x7f8a2bc31bad] 
 /usr/local/lib/libruby.so.2.5(ruby_run_node+0x1e) [0x7f8a2bc3557e] 
 /usr/local/bin/ruby(main+0x4b) [0x555827c2c94b] ./main.c:42 

 * Process memory map: 

 555827c2c000-555827c2d000 r-xp 00000000 08:01 1731333                      /usr/local/bin/ruby 
 555827e2c000-555827e2d000 r--p 00000000 08:01 1731333                      /usr/local/bin/ruby 
 555827e2d000-555827e2e000 rw-p 00001000 08:01 1731333                      /usr/local/bin/ruby 
 555828cb5000-555840568000 rw-p 00000000 00:00 0                            [heap] 
 7f8a038e6000-7f8a04000000 r--s 00000000 08:01 1731518                      /usr/local/lib/libruby.so.2.5.1 
 7f8a04000000-7f8a04021000 rw-p 00000000 00:00 0  
 7f8a04021000-7f8a08000000 ---p 00000000 00:00 0  
 7f8a08000000-7f8a08021000 rw-p 00000000 00:00 0  
 7f8a08021000-7f8a0c000000 ---p 00000000 00:00 0  
 7f8a0c000000-7f8a0c021000 rw-p 00000000 00:00 0  
 7f8a0c021000-7f8a10000000 ---p 00000000 00:00 0  
 7f8a10000000-7f8a10021000 rw-p 00000000 00:00 0  
 7f8a10021000-7f8a14000000 ---p 00000000 00:00 0  
 7f8a14000000-7f8a145c2000 rw-p 00000000 00:00 0  
 7f8a145c2000-7f8a18000000 ---p 00000000 00:00 0  
 7f8a18000000-7f8a18021000 rw-p 00000000 00:00 0  
 7f8a18021000-7f8a1c000000 ---p 00000000 00:00 0  
 7f8a1c000000-7f8a1c021000 rw-p 00000000 00:00 0  
 7f8a1c021000-7f8a20000000 ---p 00000000 00:00 0  
 7f8a20306000-7f8a204a3000 r--s 00000000 08:01 2131629                      /lib/x86_64-linux-gnu/libc-2.24.so 
 7f8a204a3000-7f8a204b9000 r-xp 00000000 08:01 2131647                      /lib/x86_64-linux-gnu/libgcc_s.so.1 
 7f8a204b9000-7f8a206b8000 ---p 00016000 08:01 2131647                      /lib/x86_64-linux-gnu/libgcc_s.so.1 
 7f8a206b8000-7f8a206b9000 r--p 00015000 08:01 2131647                      /lib/x86_64-linux-gnu/libgcc_s.so.1 
 7f8a206b9000-7f8a206ba000 rw-p 00016000 08:01 2131647                      /lib/x86_64-linux-gnu/libgcc_s.so.1 
 7f8a206ba000-7f8a206eb000 r-xp 00000000 08:01 1743350                      /usr/local/lib/ruby/2.5.0/x86_64-linux/ripper.so 
 7f8a206eb000-7f8a208eb000 ---p 00031000 08:01 1743350                      /usr/local/lib/ruby/2.5.0/x86_64-linux/ripper.so 
 7f8a208eb000-7f8a208ec000 r--p 00031000 08:01 1743350                      /usr/local/lib/ruby/2.5.0/x86_64-linux/ripper.so 
 7f8a208ec000-7f8a208ed000 rw-p 00032000 08:01 1743350                      /usr/local/lib/ruby/2.5.0/x86_64-linux/ripper.so 
 7f8a208ed000-7f8a208ee000 ---p 00000000 00:00 0  
 7f8a208ee000-7f8a209ee000 rw-p 00000000 00:00 0  
 7f8a209ee000-7f8a209ef000 ---p 00000000 00:00 0  
 7f8a209ef000-7f8a20aef000 rw-p 00000000 00:00 0  
 7f8a20aef000-7f8a20af0000 ---p 00000000 00:00 0  
 7f8a20af0000-7f8a20bf0000 rw-p 00000000 00:00 0  
 7f8a20bf0000-7f8a20bf1000 ---p 00000000 00:00 0  
 7f8a20bf1000-7f8a20cf1000 rw-p 00000000 00:00 0  
 7f8a20cf1000-7f8a20cf2000 ---p 00000000 00:00 0  
 7f8a20cf2000-7f8a20df2000 rw-p 00000000 00:00 0  
 7f8a20df2000-7f8a20df3000 ---p 00000000 00:00 0  
 7f8a20df3000-7f8a20ef3000 rw-p 00000000 00:00 0  
 7f8a20ef3000-7f8a20ef9000 r-xp 00000000 08:01 181709                       /bundle/gems/bcrypt-3.1.11/lib/bcrypt_ext.so 
 7f8a20ef9000-7f8a210f8000 ---p 00006000 08:01 181709                       /bundle/gems/bcrypt-3.1.11/lib/bcrypt_ext.so 
 7f8a210f8000-7f8a210f9000 r--p 00005000 08:01 181709                       /bundle/gems/bcrypt-3.1.11/lib/bcrypt_ext.so 
 7f8a210f9000-7f8a210fa000 rw-p 00006000 08:01 181709                       /bundle/gems/bcrypt-3.1.11/lib/bcrypt_ext.so 
 7f8a210fa000-7f8a213fb000 rw-p 00000000 00:00 0  
 7f8a213fb000-7f8a21405000 r-xp 00000000 08:01 2131671                      /lib/x86_64-linux-gnu/libnss_files-2.24.so 
 7f8a21405000-7f8a21605000 ---p 0000a000 08:01 2131671                      /lib/x86_64-linux-gnu/libnss_files-2.24.so 
 7f8a21605000-7f8a21606000 r--p 0000a000 08:01 2131671                      /lib/x86_64-linux-gnu/libnss_files-2.24.so 
 7f8a21606000-7f8a21607000 rw-p 0000b000 08:01 2131671                      /lib/x86_64-linux-gnu/libnss_files-2.24.so 
 7f8a21607000-7f8a2160d000 rw-p 00000000 00:00 0  
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 7f8a29148000-7f8a29348000 ---p 0001d000 08:01 2940817                      /usr/lib/x86_64-linux-gnu/libyaml-0.so.2.0.5 
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 7f8a2b960000-7f8a2b961000 r--p 00002000 08:01 2131639                      /lib/x86_64-linux-gnu/libdl-2.24.so 
 7f8a2b961000-7f8a2b962000 rw-p 00003000 08:01 2131639                      /lib/x86_64-linux-gnu/libdl-2.24.so 
 7f8a2b962000-7f8a2b97a000 r-xp 00000000 08:01 2131688                      /lib/x86_64-linux-gnu/libpthread-2.24.so 
 7f8a2b97a000-7f8a2bb79000 ---p 00018000 08:01 2131688                      /lib/x86_64-linux-gnu/libpthread-2.24.so 
 7f8a2bb79000-7f8a2bb7a000 r--p 00017000 08:01 2131688                      /lib/x86_64-linux-gnu/libpthread-2.24.so 
 7f8a2bb7a000-7f8a2bb7b000 rw-p 00018000 08:01 2131688                      /lib/x86_64-linux-gnu/libpthread-2.24.so 
 7f8a2bb7b000-7f8a2bb7f000 rw-p 00000000 00:00 0  
 7f8a2bb7f000-7f8a2be90000 r-xp 00000000 08:01 1731518                      /usr/local/lib/libruby.so.2.5.1 
 7f8a2be90000-7f8a2c090000 ---p 00311000 08:01 1731518                      /usr/local/lib/libruby.so.2.5.1 
 7f8a2c090000-7f8a2c095000 r--p 00311000 08:01 1731518                      /usr/local/lib/libruby.so.2.5.1 
 7f8a2c095000-7f8a2c098000 rw-p 00316000 08:01 1731518                      /usr/local/lib/libruby.so.2.5.1 
 7f8a2c098000-7f8a2c0a9000 rw-p 00000000 00:00 0  
 7f8a2c0a9000-7f8a2c0cc000 r-xp 00000000 08:01 2131611                      /lib/x86_64-linux-gnu/ld-2.24.so 
 7f8a2c18f000-7f8a2c1b4000 r--s 00000000 08:01 1731333                      /usr/local/bin/ruby 
 7f8a2c1b4000-7f8a2c1bb000 r--s 00000000 08:01 2132383                      /usr/lib/x86_64-linux-gnu/gconv/gconv-modules.cache 
 7f8a2c1bb000-7f8a2c2c0000 rw-p 00000000 00:00 0  
 7f8a2c2c5000-7f8a2c2c6000 ---p 00000000 00:00 0  
 7f8a2c2c6000-7f8a2c2cc000 rw-p 00000000 00:00 0  
 7f8a2c2cc000-7f8a2c2cd000 r--p 00023000 08:01 2131611                      /lib/x86_64-linux-gnu/ld-2.24.so 
 7f8a2c2cd000-7f8a2c2ce000 rw-p 00024000 08:01 2131611                      /lib/x86_64-linux-gnu/ld-2.24.so 
 7f8a2c2ce000-7f8a2c2cf000 rw-p 00000000 00:00 0  
 7ffce90c3000-7ffce98c2000 rw-p 00000000 00:00 0                            [stack] 
 7ffce9951000-7ffce9953000 r--p 00000000 00:00 0                            [vvar] 
 7ffce9953000-7ffce9955000 r-xp 00000000 00:00 0                            [vdso] 
 ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                    [vsyscall] 


 [NOTE] 
 You may have encountered a bug in the Ruby interpreter or extension libraries. 
 Bug reports are welcome. 
 For details: http://www.ruby-lang.org/bugreport.html 
 ~~~ 

 Also, sometimes immediately after the `Stack consistency error` occurs and prints, a `Segmentation fault` occurs and prints the same stack trace. One additional thing I noticed is that the stack trace includes both the strings `2.5.1` and `2.5.0`--I'm not sure if that's expected or the sign of a bad Ruby installation. 

 I know this isn't a particularly helpful bug report but I've unfortunately reached the limit of my expertise. Let me know if there's anything else I can provide or any additional investigation I can do!

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