July 2026 - ruby-core - ml.ruby-lang.org

[ruby-core:125704] [Ruby Bug#22104] Segfault in PRISM compiler while Bootsnap compiles aws-sdk client_api.rb
by Morred (Laura Eck) 09 Jul '26

09 Jul '26

Issue #22104 has been reported by Morred (Laura Eck). ---------------------------------------- Bug #22104: Segfault in PRISM compiler while Bootsnap compiles aws-sdk client_api.rb https://bugs.ruby-lang.org/issues/22104 * Author: Morred (Laura Eck) * Status: Open * ruby -v: 4.0.4 * Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- I'm seeing intermittent segmentation faults on aarch64-linux when Ruby compiles large auto-generated AWS SDK files, triggered through Bootsnap's ISeq compile cache. Observed while compiling: aws-sdk-dynamodb-*/lib/aws-sdk-dynamodb/client_api.rb aws-sdk-rds-*/lib/aws-sdk-rds/client_api.rb **Environment:** ruby 4.0.4 (2026-05-12 revision b89eb1bcbf) +YJIT +PRISM [aarch64-linux] I'm attaching two full backtraces including C level backtrace information: **Backtrace 1:** ``` /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/client_api.rb: [BUG] Segmentation fault at 0x0000aaab1cc9e000 ruby 4.0.4 (2026-05-12 revision b89eb1bcbf) +YJIT +PRISM [aarch64-linux] -- Control frame information ----------------------------------------------- c:0073 p:---- s:0441 e:000440 l:y b:---- DUMMY [FINISH] c:0072 p:---- s:0438 e:000437 l:y b:---- CFUNC :compile_file c:0071 p:0009 s:0432 e:000431 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/compile_cache/iseq.rb:77 [FINISH] c:0070 p:---- s:0426 e:000425 l:y b:---- CFUNC :fetch c:0069 p:0106 s:0417 e:000416 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/compile_cache/iseq.rb:135 c:0068 p:0008 s:0409 e:000408 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/compile_cache/iseq.rb:166 [FINISH] c:0067 p:---- s:0403 e:000402 l:y b:---- CFUNC :require c:0066 p:0033 s:0398 e:000397 l:n b:---- BLOCK /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60 c:0065 p:0145 s:0392 e:000391 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33 c:0064 p:0057 s:0383 e:000382 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34 [FINISH] c:0063 p:0014 s:0375 e:000373 l:y b:0001 CLASS /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/client.rb:61 c:0062 p:0008 s:0371 e:000370 l:y b:0001 CLASS /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/client.rb:55 c:0061 p:0193 s:0368 e:000367 l:y b:0001 TOP /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/client.rb:42 [FINISH] c:0060 p:---- s:0365 e:000364 l:y b:---- CFUNC :require c:0059 p:0033 s:0360 e:000359 l:n b:---- BLOCK /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60 c:0058 p:0145 s:0354 e:000353 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33 c:0057 p:0057 s:0345 e:000344 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34 [FINISH] c:0056 p:0007 s:0337 e:000336 l:y b:0001 CLASS /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/customizations/client.rb:5 c:0055 p:0007 s:0334 e:000333 l:y b:0001 CLASS /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/customizations/client.rb:4 c:0054 p:0007 s:0331 e:000330 l:y b:0001 TOP /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/customizations/client.rb:3 [FINISH] c:0053 p:---- s:0328 e:000327 l:y b:---- CFUNC :require c:0052 p:0033 s:0323 e:000322 l:n b:---- BLOCK /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60 c:0051 p:0145 s:0317 e:000316 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33 c:0050 p:0057 s:0308 e:000307 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34 c:0049 p:0011 s:0300 e:000299 l:y b:0001 TOP /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/customizations.rb:4 [FINISH] c:0048 p:---- s:0297 e:000296 l:y b:---- CFUNC :require_relative c:0047 p:0032 s:0292 e:000291 l:y b:0001 TOP /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb.rb:63 [FINISH] c:0046 p:---- s:0289 e:000288 l:y b:---- CFUNC :require c:0045 p:0033 s:0284 e:000283 l:n b:---- BLOCK /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60 c:0044 p:0145 s:0278 e:000277 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33 c:0043 p:0057 s:0269 e:000268 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34 c:0042 p:0005 s:0261 e:000260 l:y b:0001 TOP /jeancaisse/packs/utils/app/lib/aws/dynamo_d_b.rb:3 [FINISH] c:0041 p:---- s:0258 e:000257 l:y b:---- CFUNC :require c:0040 p:0033 s:0253 e:000252 l:n b:---- BLOCK /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60 c:0039 p:0145 s:0247 e:000246 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33 c:0038 p:0026 s:0238 e:000237 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:26 [FINISH] c:0037 p:---- s:0230 e:000229 l:y b:---- CFUNC :const_get c:0036 p:0010 s:0224 e:000223 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/cref.rb:62 c:0035 p:0039 s:0220 e:000219 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:175 c:0034 p:0063 s:0212 e:000211 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/file_system.rb:51 [FINISH] c:0033 p:0027 s:0206 e:000205 l:y b:0001 METHOD <internal:array>:228 c:0032 p:0020 s:0200 e:000199 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/file_system.rb:40 c:0031 p:0048 s:0191 e:000190 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:170 c:0030 p:0010 s:0180 e:000179 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:18 [FINISH] c:0029 p:---- s:0175 e:000174 l:y b:---- CFUNC :each c:0028 p:0032 s:0171 e:000170 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:17 [FINISH] c:0027 p:0018 s:0168 e:000167 l:y b:0001 METHOD <internal:thread_sync>:130 c:0026 p:0006 s:0164 e:000163 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:11 c:0025 p:0005 s:0158 e:000157 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/autoloaders.rb:32 c:0024 p:0009 s:0154 e:000153 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/application.rb:556 c:0023 p:0085 s:0150 e:000149 l:y b:0001 METHOD /jeancaisse/spec/account_copy_e2e_tests.rb:91 c:0022 p:0019 s:0137 e:000136 l:n b:---- BLOCK /jeancaisse/spec/account_copy_e2e_tests.rb:128 c:0021 p:0006 s:0134 e:000133 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/rspec-mocks-3.13.8/lib/rspec/mocks.rb:96 c:0020 p:0043 s:0129 E:002088 l:y b:0001 TOP /jeancaisse/spec/account_copy_e2e_tests.rb:127 [FINISH] c:0019 p:---- s:0125 e:000124 l:y b:---- CFUNC :load c:0018 p:0006 s:0120 e:000119 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/commands/runner/runner_command.rb:44 c:0017 p:0015 s:0117 e:000116 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/activesupport-8.1.3/lib/active_support/execution_wrapper.rb:91 c:0016 p:0019 s:0109 e:000108 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/commands/runner/runner_command.rb:70 c:0015 p:0090 s:0102 e:000101 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/commands/runner/runner_command.rb:43 c:0014 p:0054 s:0093 e:000092 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/thor-1.5.0/lib/thor/command.rb:28 c:0013 p:0040 s:0085 e:000084 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/thor-1.5.0/lib/thor/invocation.rb:127 c:0012 p:0032 s:0078 e:000077 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/command/base.rb:176 c:0011 p:0246 s:0071 e:000070 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/thor-1.5.0/lib/thor.rb:538 c:0010 p:0049 s:0058 e:000057 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/command/base.rb:71 c:0009 p:0024 s:0051 e:000050 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/command.rb:65 c:0008 p:0015 s:0048 e:000047 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/command.rb:143 c:0007 p:0048 s:0042 e:000041 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/command.rb:63 c:0006 p:0038 s:0031 e:000030 l:y b:0001 TOP /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/commands.rb:18 [FINISH] c:0005 p:---- s:0026 e:000025 l:y b:---- CFUNC :require c:0004 p:0033 s:0021 e:000020 l:n b:---- BLOCK /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60 c:0003 p:0145 s:0015 e:000014 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33 c:0002 p:0024 s:0006 e:000005 l:n b:---- EVAL bin/rails:6 [FINISH] c:0001 p:0000 s:0003 E:0019e0 l:y b:---- DUMMY [FINISH] -- Ruby level backtrace information ---------------------------------------- bin/rails:6:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33:in 'require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in replace_require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'require' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/commands.rb:18:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/command.rb:63:in 'invoke' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/command.rb:143:in 'with_argv' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/command.rb:65:in 'block in invoke' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/command/base.rb:71:in 'perform' /usr/local/bundle/ruby/4.0.0/gems/thor-1.5.0/lib/thor.rb:538:in 'dispatch' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/command/base.rb:176:in 'invoke_command' /usr/local/bundle/ruby/4.0.0/gems/thor-1.5.0/lib/thor/invocation.rb:127:in 'invoke_command' /usr/local/bundle/ruby/4.0.0/gems/thor-1.5.0/lib/thor/command.rb:28:in 'run' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/commands/runner/runner_command.rb:43:in 'perform' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/commands/runner/runner_command.rb:70:in 'conditional_executor' /usr/local/bundle/ruby/4.0.0/gems/activesupport-8.1.3/lib/active_support/execution_wrapper.rb:91:in 'wrap' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/commands/runner/runner_command.rb:44:in 'block in perform' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/commands/runner/runner_command.rb:44:in 'load' /jeancaisse/spec/account_copy_e2e_tests.rb:127:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/rspec-mocks-3.13.8/lib/rspec/mocks.rb:96:in 'with_temporary_scope' /jeancaisse/spec/account_copy_e2e_tests.rb:128:in 'block in <main>' /jeancaisse/spec/account_copy_e2e_tests.rb:91:in 'run' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/application.rb:556:in 'eager_load!' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/autoloaders.rb:32:in 'each' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:11:in 'eager_load' <internal:thread_sync>:130:in 'synchronize' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:17:in 'block in eager_load' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:17:in 'each' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:18:in 'block (2 levels) in eager_load' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:170:in 'actual_eager_load_dir' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/file_system.rb:40:in 'ls' <internal:array>:228:in 'each' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/file_system.rb:51:in 'block in ls' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:175:in 'block in actual_eager_load_dir' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/cref.rb:62:in 'get' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/cref.rb:62:in 'const_get' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:26:in 'require' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33:in 'require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in replace_require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'require' /jeancaisse/packs/utils/app/lib/aws/dynamo_d_b.rb:3:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34:in 'require' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33:in 'require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in replace_require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'require' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb.rb:63:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb.rb:63:in 'require_relative' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/customizations.rb:4:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34:in 'require' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33:in 'require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in replace_require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'require' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/customizations/client.rb:3:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/customizations/client.rb:4:in '<module:Aws>' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/customizations/client.rb:5:in '<module:DynamoDB>' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34:in 'require' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33:in 'require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in replace_require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'require' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/client.rb:42:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/client.rb:55:in '<module:DynamoDB>' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-dynamodb-1.165.0/lib/aws-sdk-dynamodb/client.rb:61:in '<class:Client>' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34:in 'require' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33:in 'require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in replace_require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'require' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/compile_cache/iseq.rb:166:in 'load_iseq' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/compile_cache/iseq.rb:135:in 'fetch' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/compile_cache/iseq.rb:135:in 'fetch' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/compile_cache/iseq.rb:77:in 'input_to_storage' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.4/lib/bootsnap/compile_cache/iseq.rb:77:in 'compile_file' -- Threading information --------------------------------------------------- Total ractor count: 1 Ruby thread count for this ractor: 3 -- Machine register context ------------------------------------------------ x0: 0x0415f704e8c1b50c x1: 0x30e2222405b75990 x2: 0x4cf5ad432745937f x3: 0x87c37b91114253d5 x4: 0x0000ffffa33963b0 x5: 0x0000000000000000 x6: 0x0000aaaaef82a400 x7: 0x0000aaab1c626b50 x18: 0x0000aaaaef82a778 x19: 0x0000aaab1cc9dff8 x20: 0x0000aaabffa64400 x21: 0x0000ffffde70e050 x22: 0x0000aaaaef830c20 x23: 0x0000ffffa33d5000 x24: 0x0000ffffa2ed3020 x25: 0x0000ffffde70e050 x26: 0x0000aaab1c67d480 x27: 0x0000000000000049 x28: 0x0000000000000001 x29: 0x0000ffffde70dfa0 sp: 0x0000ffffde70dfa0 fau: 0x0000aaab1cc9e000 -- C level backtrace information ------------------------------------------- /usr/local/lib/libruby.so.4.0(fprintf+0x0) [0xffffa2f123f4] /usr/src/ruby/vm_dump.c:1105 /usr/local/lib/libruby.so.4.0(rb_vm_bugreport) /usr/src/ruby/vm_dump.c:1453 /usr/local/lib/libruby.so.4.0(rb_bug_for_fatal_signal+0xd4) [0xffffa2cddc04] /usr/src/ruby/error.c:1131 /usr/local/lib/libruby.so.4.0(sigsegv+0x58) [0xffffa2e48328] /usr/src/ruby/signal.c:948 linux-vdso.so.1(__kernel_rt_sigreturn+0x0) [0xffffa3424838] /usr/local/lib/libruby.so.4.0(vm_ci_hash+0x50) [0xffffa2ed3800] /usr/src/ruby/vm_method.c:632 /usr/local/lib/libruby.so.4.0(normalize_hash_value+0x0) [0xffffa2e546a0] /usr/src/ruby/st.c:331 /usr/local/lib/libruby.so.4.0(do_hash) /usr/src/ruby/st.c:332 /usr/local/lib/libruby.so.4.0(rb_st_update) /usr/src/ruby/st.c:1472 /usr/local/lib/libruby.so.4.0(rb_vm_ci_lookup+0xac) [0xffffa2edd038] /usr/src/ruby/vm_method.c:712 /usr/local/lib/libruby.so.4.0(vm_ci_new_+0x4) [0xffffa2c4c208] /usr/src/ruby/vm_callinfo.h:219 /usr/local/lib/libruby.so.4.0(new_callinfo) /usr/src/ruby/compile.c:1486 /usr/local/lib/libruby.so.4.0(new_insn_send+0xfc) [0xffffa2c4e848] /usr/src/ruby/compile.c:1495 /usr/local/lib/libruby.so.4.0(ADD_ELEM+0x0) [0xffffa2c959d0] /usr/src/ruby/prism_compile.c:3789 /usr/local/lib/libruby.so.4.0(pm_compile_call) /usr/src/ruby/prism_compile.c:3789 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x1218) [0xffffa2c83598] /usr/src/ruby/prism_compile.c:8790 /usr/local/lib/libruby.so.4.0(pm_compile_constant_write_node+0x12c) [0xffffa2c91bcc] /usr/src/ruby/prism_compile.c:5809 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x54c) [0xffffa2c828cc] /usr/src/ruby/prism_compile.c:9055 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x3698) [0xffffa2c85a18] /usr/src/ruby/prism_compile.c:10324 /usr/local/lib/libruby.so.4.0(pm_compile_scope_node+0x1b0c) [0xffffa2c9c974] /usr/src/ruby/prism_compile.c:7044 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x1a00) [0xffffa2c83d80] /usr/src/ruby/prism_compile.c:10197 /usr/local/lib/libruby.so.4.0(pm_iseq_compile_node+0x60) [0xffffa2c9e240] /usr/src/ruby/prism_compile.c:10508 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt_try+0x1c) [0xffffa2d576fc] /usr/src/ruby/iseq.c:1105 /usr/local/lib/libruby.so.4.0(rb_protect+0xb8) [0xffffa2ce9d58] /usr/src/ruby/eval.c:1127 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt+0x150) [0xffffa2d50138] /usr/src/ruby/iseq.c:1158 /usr/local/lib/libruby.so.4.0(pm_new_child_iseq+0xb8) [0xffffa2c4a440] /usr/src/ruby/prism_compile.c:1276 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x328c) [0xffffa2c8560c] /usr/src/ruby/prism_compile.c:9869 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x36c8) [0xffffa2c85a48] /usr/src/ruby/prism_compile.c:10326 /usr/local/lib/libruby.so.4.0(pm_compile_scope_node+0x1b0c) [0xffffa2c9c974] /usr/src/ruby/prism_compile.c:7044 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x1a00) [0xffffa2c83d80] /usr/src/ruby/prism_compile.c:10197 /usr/local/lib/libruby.so.4.0(pm_iseq_compile_node+0x60) [0xffffa2c9e240] /usr/src/ruby/prism_compile.c:10508 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt_try+0x1c) [0xffffa2d576fc] /usr/src/ruby/iseq.c:1105 /usr/local/lib/libruby.so.4.0(rb_protect+0xb8) [0xffffa2ce9d58] /usr/src/ruby/eval.c:1127 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt+0x150) [0xffffa2d50138] /usr/src/ruby/iseq.c:1158 /usr/local/lib/libruby.so.4.0(pm_new_child_iseq+0xb8) [0xffffa2c4a440] /usr/src/ruby/prism_compile.c:1276 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x328c) [0xffffa2c8560c] /usr/src/ruby/prism_compile.c:9869 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x36c8) [0xffffa2c85a48] /usr/src/ruby/prism_compile.c:10326 /usr/local/lib/libruby.so.4.0(pm_compile_scope_node+0x1b0c) [0xffffa2c9c974] /usr/src/ruby/prism_compile.c:7044 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x1a00) [0xffffa2c83d80] /usr/src/ruby/prism_compile.c:10197 /usr/local/lib/libruby.so.4.0(APPEND_LIST+0x0) [0xffffa2c9e2b4] /usr/src/ruby/prism_compile.c:10498 /usr/local/lib/libruby.so.4.0(pm_iseq_compile_node) /usr/src/ruby/prism_compile.c:10502 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt_try+0x1c) [0xffffa2d576fc] /usr/src/ruby/iseq.c:1105 /usr/local/lib/libruby.so.4.0(rb_protect+0xb8) [0xffffa2ce9d58] /usr/src/ruby/eval.c:1127 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt+0x150) [0xffffa2d50138] /usr/src/ruby/iseq.c:1158 /usr/local/lib/libruby.so.4.0(iseqw_s_compile_file_prism+0x1c4) [0xffffa2d5076c] /usr/src/ruby/iseq.c:1925 [0xffff602d3254] ``` **Backtrace 2:** ``` /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-rds-1.314.0/lib/aws-sdk-rds/client_api.rb: [BUG] Segmentation fault at 0x0000aaab3c709000 ruby 4.0.4 (2026-05-12 revision b89eb1bcbf) +YJIT +PRISM [aarch64-linux] -- Control frame information ----------------------------------------------- c:0061 p:---- s:0367 e:000366 l:y b:---- DUMMY [FINISH] c:0060 p:---- s:0364 e:000363 l:y b:---- CFUNC :compile_file c:0059 p:0009 s:0358 e:000357 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/compile_cache/iseq.rb:91 [FINISH] c:0058 p:---- s:0352 e:000351 l:y b:---- CFUNC :fetch c:0057 p:0099 s:0343 e:000342 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/compile_cache/iseq.rb:154 c:0056 p:0008 s:0335 e:000334 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/compile_cache/iseq.rb:185 [FINISH] c:0055 p:---- s:0329 e:000328 l:y b:---- CFUNC :require c:0054 p:0033 s:0324 e:000323 l:n b:---- BLOCK /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60 c:0053 p:0145 s:0318 e:000317 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33 c:0052 p:0057 s:0309 e:000308 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34 [FINISH] c:0051 p:0014 s:0301 e:000299 l:y b:0001 CLASS /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-rds-1.314.0/lib/aws-sdk-rds/client.rb:59 c:0050 p:0008 s:0297 e:000296 l:y b:0001 CLASS /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-rds-1.314.0/lib/aws-sdk-rds/client.rb:53 c:0049 p:0181 s:0294 e:000293 l:y b:0001 TOP /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-rds-1.314.0/lib/aws-sdk-rds/client.rb:40 [FINISH] c:0048 p:---- s:0291 e:000290 l:y b:---- CFUNC :require c:0047 p:0033 s:0286 e:000285 l:n b:---- BLOCK /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60 c:0046 p:0145 s:0280 e:000279 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33 c:0045 p:0057 s:0271 e:000270 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34 [FINISH] c:0044 p:0017 s:0263 e:000262 l:y b:0001 TOP /jeancaisse/packs/utils/app/lib/aws/rds.rb:12 [FINISH] c:0043 p:---- s:0260 e:000259 l:y b:---- CFUNC :require c:0042 p:0033 s:0255 e:000254 l:n b:---- BLOCK /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60 c:0041 p:0145 s:0249 e:000248 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33 c:0040 p:0026 s:0240 e:000239 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:26 [FINISH] c:0039 p:---- s:0232 e:000231 l:y b:---- CFUNC :const_get c:0038 p:0010 s:0226 e:000225 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/cref.rb:62 c:0037 p:0039 s:0222 e:000221 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:175 c:0036 p:0063 s:0214 e:000213 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/file_system.rb:51 [FINISH] c:0035 p:0027 s:0208 e:000207 l:y b:0001 METHOD <internal:array>:228 c:0034 p:0020 s:0202 e:000201 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/file_system.rb:40 c:0033 p:0048 s:0193 e:000192 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:170 c:0032 p:0010 s:0182 e:000181 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:18 [FINISH] c:0031 p:---- s:0177 e:000176 l:y b:---- CFUNC :each c:0030 p:0032 s:0173 e:000172 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:17 [FINISH] c:0029 p:0018 s:0170 e:000169 l:y b:0001 METHOD <internal:thread_sync>:130 c:0028 p:0006 s:0166 e:000165 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:11 c:0027 p:0005 s:0160 e:000159 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/autoloaders.rb:32 c:0026 p:0009 s:0156 e:000155 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/application.rb:556 c:0025 p:0014 s:0152 e:000151 l:y b:0001 METHOD /jeancaisse/spec/support/eager_load.rb:29 c:0024 p:0132 s:0143 e:000142 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/example_group.rb:273 c:0023 p:0013 s:0132 E:000fa0 l:n b:---- BLOCK /jeancaisse/spec/config/initializers/0_custom_load_hooks_spec.rb:8 [FINISH] c:0022 p:---- s:0129 e:000128 l:y b:---- CFUNC :module_exec c:0021 p:0047 s:0125 e:000124 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/example_group.rb:405 c:0020 p:0012 s:0115 e:000114 l:n b:---- BLOCK /jeancaisse/spec/support/eager_load.rb:30 c:0019 p:0023 s:0112 e:000111 l:y b:0001 METHOD /jeancaisse/spec/support/eager_load.rb:10 c:0018 p:0020 s:0107 e:000106 l:y b:0001 METHOD /jeancaisse/spec/support/eager_load.rb:30 c:0017 p:0132 s:0098 e:000097 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/example_group.rb:273 c:0016 p:0013 s:0087 e:000086 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/dsl.rb:43 c:0015 p:0014 s:0080 e:000079 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/dsl.rb:84 c:0014 p:0006 s:0074 E:000aa0 l:y b:0001 TOP /jeancaisse/spec/config/initializers/0_custom_load_hooks_spec.rb:3 [FINISH] c:0013 p:---- s:0071 e:000070 l:y b:---- CFUNC :load c:0012 p:0007 s:0066 e:000065 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/configuration.rb:2144 c:0011 p:0015 s:0057 e:000056 l:n b:---- BLOCK /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/configuration.rb:1643 [FINISH] c:0010 p:0027 s:0052 e:000051 l:y b:0001 METHOD <internal:array>:228 c:0009 p:0017 s:0046 e:000045 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/configuration.rb:1641 c:0008 p:0029 s:0042 e:000041 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/runner.rb:102 c:0007 p:0007 s:0036 e:000035 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/runner.rb:86 c:0006 p:0080 s:0030 e:000029 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/runner.rb:71 c:0005 p:0013 s:0022 e:000021 l:y b:0001 METHOD /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/runner.rb:45 c:0004 p:0010 s:0017 e:000016 l:y b:0001 TOP /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/exe/rspec:4 [FINISH] c:0003 p:---- s:0014 e:000013 l:y b:---- CFUNC :load c:0002 p:0301 s:0009 E:002438 l:n b:---- EVAL bin/rspec:59 [FINISH] c:0001 p:0000 s:0003 E:001170 l:y b:---- DUMMY [FINISH] -- Ruby level backtrace information ---------------------------------------- bin/rspec:59:in '<main>' bin/rspec:59:in 'load' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/exe/rspec:4:in '<top (required)>' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/runner.rb:45:in 'invoke' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/runner.rb:71:in 'run' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/runner.rb:86:in 'run' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/runner.rb:102:in 'setup' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/configuration.rb:1641:in 'load_spec_files' <internal:array>:228:in 'each' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/configuration.rb:1643:in 'block in load_spec_files' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/configuration.rb:2144:in 'load_file_handling_errors' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/configuration.rb:2144:in 'load' /jeancaisse/spec/config/initializers/0_custom_load_hooks_spec.rb:3:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/dsl.rb:84:in 'block (2 levels) in expose_example_group_alias_globally' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/dsl.rb:43:in 'block in expose_example_group_alias' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/example_group.rb:273:in 'block in define_example_group_method' /jeancaisse/spec/support/eager_load.rb:30:in 'subclass' /jeancaisse/spec/support/eager_load.rb:10:in 'within_eager_load_example_group' /jeancaisse/spec/support/eager_load.rb:30:in 'block in subclass' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/example_group.rb:405:in 'subclass' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/example_group.rb:405:in 'module_exec' /jeancaisse/spec/config/initializers/0_custom_load_hooks_spec.rb:8:in 'block in <main>' /usr/local/bundle/ruby/4.0.0/gems/rspec-core-3.13.6/lib/rspec/core/example_group.rb:273:in 'block in define_example_group_method' /jeancaisse/spec/support/eager_load.rb:29:in 'subclass' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/application.rb:556:in 'eager_load!' /usr/local/bundle/ruby/4.0.0/gems/railties-8.1.3/lib/rails/autoloaders.rb:32:in 'each' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:11:in 'eager_load' <internal:thread_sync>:130:in 'synchronize' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:17:in 'block in eager_load' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:17:in 'each' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:18:in 'block (2 levels) in eager_load' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:170:in 'actual_eager_load_dir' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/file_system.rb:40:in 'ls' <internal:array>:228:in 'each' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/file_system.rb:51:in 'block in ls' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/loader/eager_load.rb:175:in 'block in actual_eager_load_dir' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/cref.rb:62:in 'get' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/cref.rb:62:in 'const_get' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:26:in 'require' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33:in 'require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in replace_require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'require' /jeancaisse/packs/utils/app/lib/aws/rds.rb:12:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34:in 'require' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33:in 'require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in replace_require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'require' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-rds-1.314.0/lib/aws-sdk-rds/client.rb:40:in '<main>' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-rds-1.314.0/lib/aws-sdk-rds/client.rb:53:in '<module:RDS>' /usr/local/bundle/ruby/4.0.0/gems/aws-sdk-rds-1.314.0/lib/aws-sdk-rds/client.rb:59:in '<class:Client>' /usr/local/bundle/ruby/4.0.0/gems/zeitwerk-2.8.0/lib/zeitwerk/core_ext/kernel.rb:34:in 'require' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:33:in 'require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in replace_require' /usr/local/lib/ruby/4.0.0/bundled_gems.rb:60:in 'require' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/compile_cache/iseq.rb:185:in 'load_iseq' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/compile_cache/iseq.rb:154:in 'fetch' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/compile_cache/iseq.rb:154:in 'fetch' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/compile_cache/iseq.rb:91:in 'input_to_storage' /usr/local/bundle/ruby/4.0.0/gems/bootsnap-1.24.6/lib/bootsnap/compile_cache/iseq.rb:91:in 'compile_file' -- Threading information --------------------------------------------------- Total ractor count: 1 Ruby thread count for this ractor: 3 -- Machine register context ------------------------------------------------ x0: 0xbd7a2588f4a9410c x1: 0xf19e26916fea2c46 x2: 0x4cf5ad432745937f x3: 0x87c37b91114253d5 x4: 0x0000ffffb68963b0 x5: 0x0000000000000000 x6: 0x0000aaab0d7d0400 x7: 0x0000aaab3c026af0 x18: 0x0000aaab0d7d0778 x19: 0x0000aaab3c708ff8 x20: 0x0000aaad0c2c1180 x21: 0x0000ffffc6ff6dd0 x22: 0x0000aaab0d7d6c20 x23: 0x0000ffffb68d5000 x24: 0x0000ffffb63d3020 x25: 0x0000ffffc6ff6dd0 x26: 0x0000aaab3a3dcf00 x27: 0x0000000000000041 x28: 0x0000000000000001 x29: 0x0000ffffc6ff6d20 sp: 0x0000ffffc6ff6d20 fau: 0x0000aaab3c709000 -- C level backtrace information ------------------------------------------- /usr/local/lib/libruby.so.4.0(fprintf+0x0) [0xffffb64123f4] /usr/src/ruby/vm_dump.c:1105 /usr/local/lib/libruby.so.4.0(rb_vm_bugreport) /usr/src/ruby/vm_dump.c:1453 /usr/local/lib/libruby.so.4.0(rb_bug_for_fatal_signal+0xd4) [0xffffb61ddc04] /usr/src/ruby/error.c:1131 /usr/local/lib/libruby.so.4.0(sigsegv+0x58) [0xffffb6348328] /usr/src/ruby/signal.c:948 linux-vdso.so.1(__kernel_rt_sigreturn+0x0) [0xffffb691b838] /usr/local/lib/libruby.so.4.0(vm_ci_hash+0x50) [0xffffb63d3800] /usr/src/ruby/vm_method.c:632 /usr/local/lib/libruby.so.4.0(normalize_hash_value+0x0) [0xffffb63546a0] /usr/src/ruby/st.c:331 /usr/local/lib/libruby.so.4.0(do_hash) /usr/src/ruby/st.c:332 /usr/local/lib/libruby.so.4.0(rb_st_update) /usr/src/ruby/st.c:1472 /usr/local/lib/libruby.so.4.0(rb_vm_ci_lookup+0xac) [0xffffb63dd038] /usr/src/ruby/vm_method.c:712 /usr/local/lib/libruby.so.4.0(vm_ci_new_+0x4) [0xffffb614c208] /usr/src/ruby/vm_callinfo.h:219 /usr/local/lib/libruby.so.4.0(new_callinfo) /usr/src/ruby/compile.c:1486 /usr/local/lib/libruby.so.4.0(new_insn_send+0xfc) [0xffffb614e848] /usr/src/ruby/compile.c:1495 /usr/local/lib/libruby.so.4.0(pm_compile_call+0x930) [0xffffb6195a58] /usr/src/ruby/prism_compile.c:3794 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x1218) [0xffffb6183598] /usr/src/ruby/prism_compile.c:8790 /usr/local/lib/libruby.so.4.0(pm_setup_args_core+0xe4) [0xffffb6191cf0] /usr/src/ruby/prism_compile.c:1816 /usr/local/lib/libruby.so.4.0(pm_setup_args+0xdc) [0xffffb61927e4] /usr/src/ruby/prism_compile.c:2020 /usr/local/lib/libruby.so.4.0(ISEQ_COMPILE_DATA+0x0) [0xffffb6195210] /usr/src/ruby/prism_compile.c:3706 /usr/local/lib/libruby.so.4.0(pm_compile_call) /usr/src/ruby/prism_compile.c:3707 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x1218) [0xffffb6183598] /usr/src/ruby/prism_compile.c:8790 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x3698) [0xffffb6185a18] /usr/src/ruby/prism_compile.c:10324 /usr/local/lib/libruby.so.4.0(pm_compile_scope_node+0x1b0c) [0xffffb619c974] /usr/src/ruby/prism_compile.c:7044 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x1a00) [0xffffb6183d80] /usr/src/ruby/prism_compile.c:10197 /usr/local/lib/libruby.so.4.0(pm_iseq_compile_node+0x60) [0xffffb619e240] /usr/src/ruby/prism_compile.c:10508 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt_try+0x1c) [0xffffb62576fc] /usr/src/ruby/iseq.c:1105 /usr/local/lib/libruby.so.4.0(rb_protect+0xb8) [0xffffb61e9d58] /usr/src/ruby/eval.c:1127 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt+0x150) [0xffffb6250138] /usr/src/ruby/iseq.c:1158 /usr/local/lib/libruby.so.4.0(pm_new_child_iseq+0xb8) [0xffffb614a440] /usr/src/ruby/prism_compile.c:1276 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x328c) [0xffffb618560c] /usr/src/ruby/prism_compile.c:9869 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x36c8) [0xffffb6185a48] /usr/src/ruby/prism_compile.c:10326 /usr/local/lib/libruby.so.4.0(pm_compile_scope_node+0x1b0c) [0xffffb619c974] /usr/src/ruby/prism_compile.c:7044 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x1a00) [0xffffb6183d80] /usr/src/ruby/prism_compile.c:10197 /usr/local/lib/libruby.so.4.0(pm_iseq_compile_node+0x60) [0xffffb619e240] /usr/src/ruby/prism_compile.c:10508 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt_try+0x1c) [0xffffb62576fc] /usr/src/ruby/iseq.c:1105 /usr/local/lib/libruby.so.4.0(rb_protect+0xb8) [0xffffb61e9d58] /usr/src/ruby/eval.c:1127 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt+0x150) [0xffffb6250138] /usr/src/ruby/iseq.c:1158 /usr/local/lib/libruby.so.4.0(pm_new_child_iseq+0xb8) [0xffffb614a440] /usr/src/ruby/prism_compile.c:1276 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x328c) [0xffffb618560c] /usr/src/ruby/prism_compile.c:9869 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x36c8) [0xffffb6185a48] /usr/src/ruby/prism_compile.c:10326 /usr/local/lib/libruby.so.4.0(pm_compile_scope_node+0x1b0c) [0xffffb619c974] /usr/src/ruby/prism_compile.c:7044 /usr/local/lib/libruby.so.4.0(pm_compile_node+0x1a00) [0xffffb6183d80] /usr/src/ruby/prism_compile.c:10197 /usr/local/lib/libruby.so.4.0(APPEND_LIST+0x0) [0xffffb619e2b4] /usr/src/ruby/prism_compile.c:10498 /usr/local/lib/libruby.so.4.0(pm_iseq_compile_node) /usr/src/ruby/prism_compile.c:10502 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt_try+0x1c) [0xffffb62576fc] /usr/src/ruby/iseq.c:1105 /usr/local/lib/libruby.so.4.0(rb_protect+0xb8) [0xffffb61e9d58] /usr/src/ruby/eval.c:1127 /usr/local/lib/libruby.so.4.0(pm_iseq_new_with_opt+0x150) [0xffffb6250138] /usr/src/ruby/iseq.c:1158 /usr/local/lib/libruby.so.4.0(iseqw_s_compile_file_prism+0x1c4) [0xffffb625076c] /usr/src/ruby/iseq.c:1925 [0xffff77cb7e20] ``` -- https://bugs.ruby-lang.org/

6 16

[ruby-core:124833] [Ruby Bug#21882] IO::Buffer#locked leaves the buffer locked when the block raises
by hanazuki (Kasumi Hanazuki) 09 Jul '26

09 Jul '26

Issue #21882 has been reported by hanazuki (Kasumi Hanazuki). ---------------------------------------- Bug #21882: IO::Buffer#locked leaves the buffer locked when the block raises https://bugs.ruby-lang.org/issues/21882 * Author: hanazuki (Kasumi Hanazuki) * Status: Open * ruby -v: ruby 4.0.1 (2026-01-13 revision e04267a14b) +PRISM [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- `IO::Buffer#locked` should unlock the buffer even after the block raises an exception. ```ruby buf = IO::Buffer.new(100) buf.locked { fail } rescue nil buf.locked { p :ok } # expected to print :ok, but actually raises a LockedError ``` -- https://bugs.ruby-lang.org/

5 6

[ruby-core:125803] [Ruby Bug#22124] void value missed in parse.y
by kddnewton (Kevin Newton) 09 Jul '26

09 Jul '26

Issue #22124 has been reported by kddnewton (Kevin Newton). ---------------------------------------- Bug #22124: void value missed in parse.y https://bugs.ruby-lang.org/issues/22124 * Author: kddnewton (Kevin Newton) * Status: Open * Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- ``` $ ruby --parser=parse.y -cwe 'x = return a b do end' Syntax OK $ ruby --parser=prism -cwe 'x = return a b do end' ruby: -e:1: syntax error found (SyntaxError) > 1 | x = return a b do end | ^~~~~~~~~~~~~~~~~ unexpected void value expression ``` I think it's likely because of the wrapped block expression. -- https://bugs.ruby-lang.org/

4 3

[ruby-core:125818] [Ruby Bug#22126] Stack underflow for partial DCE and loops
by viralpraxis (Iaroslav Kurbatov) 09 Jul '26

09 Jul '26

Issue #22126 has been reported by viralpraxis (Iaroslav Kurbatov). ---------------------------------------- Bug #22126: Stack underflow for partial DCE and loops https://bugs.ruby-lang.org/issues/22126 * Author: viralpraxis (Iaroslav Kurbatov) * Status: Open * ruby -v: ruby 4.1.0dev (2026-06-23T13:29:36Z master 13fe77dd2b) +PRISM [x86_64-linux] * Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- ``` ruby ruby --parser prism -e 'if []; else; a => [*, 42, *]; end' -- raw disasm-------- trace: 1 0000 putnil ( 1) 0001 leave ( 1) <L018> [sp: 1, unremovable: 0, refcnt: 1] 0002 dup ( 1) 0003 topn 2 ( 1) 0005 opt_le <calldata:<=, 1> ( 1) 0007 branchunless <L021> ( 1) 0009 topn 3 ( 1) 0011 topn 1 ( 1) 0013 opt_aref <calldata:[], 1> ( 1) 0015 putobject 42 ( 1) 0017 dupn 2 ( 1) 0019 checkmatch 2 ( 1) 0021 dup ( 1) 0022 branchif <L023> ( 1) 0024 putspecialobject 1 ( 1) 0026 putobject "%p === %p does not return true" ( 1) 0028 topn 3 ( 1) 0030 topn 5 ( 1) 0032 opt_send_without_block <calldata:core#sprintf, 3> ( 1) 0034 setn 10 ( 1) 0036 putobject false ( 1) 0038 setn 12 ( 1) 0040 pop ( 1) 0041 pop ( 1) <L023> [sp: 4, unremovable: 0, refcnt: 1] 0042 setn 2 ( 1) 0044 pop ( 1) 0045 pop ( 1) 0046 branchif <L020> ( 1) 0048 putobject_INT2FIX_1_ ( 1) 0049 opt_plus <calldata:+, 1> ( 1) 0051 jump <L018> ( 1) <L021> [sp: 1, unremovable: 0, refcnt: 1] * 0053 adjuststack 3 ( 1) 0055 putspecialobject 1 ( 1) 0057 putobject "%p does not match to find pattern" ( 1) 0059 topn 2 ( 1) 0061 opt_send_without_block <calldata:core#sprintf, 2> ( 1) 0063 setn 4 ( 1) 0065 putobject false ( 1) 0067 setn 6 ( 1) 0069 pop ( 1) 0070 pop ( 1) 0071 jump <L012> ( 1) <L020> [sp: 1, unremovable: 0, refcnt: 1] 0073 adjuststack 3 ( 1) 0075 pop ( 1) 0076 jump <L003> ( 1) <L012> [sp: -1, unremovable: 0, refcnt: 1] 0078 pop ( 1) 0079 putspecialobject 1 ( 1) 0081 topn 4 ( 1) 0083 branchif <L024> ( 1) 0085 putobject NoMatchingPatternError ( 1) 0087 putspecialobject 1 ( 1) 0089 putobject "%p: %s" ( 1) 0091 topn 4 ( 1) 0093 topn 7 ( 1) 0095 opt_send_without_block <calldata:core#sprintf, 3> ( 1) 0097 opt_send_without_block <calldata:core#raise, 2> ( 1) 0099 jump <L025> ( 1) <L024> [sp: -1, unremovable: 0, refcnt: 1] 0101 putobject NoMatchingPatternKeyError ( 1) 0103 putspecialobject 1 ( 1) 0105 putobject "%p: %s" ( 1) 0107 topn 4 ( 1) 0109 topn 7 ( 1) 0111 opt_send_without_block <calldata:core#sprintf, 3> ( 1) 0113 topn 7 ( 1) 0115 topn 9 ( 1) 0117 opt_send_without_block <calldata:new, 3> ( 1) 0119 opt_send_without_block <calldata:core#raise, 1> ( 1) <L025> [sp: -1, unremovable: 0, refcnt: 1] 0121 adjuststack 7 ( 1) 0123 putnil ( 1) 0124 leave ( 1) <L003> [sp: -1, unremovable: 0, refcnt: 1] 0125 adjuststack 6 ( 1) 0127 putnil ( 1) 0128 leave ( 1) --------------------- -e:1: argument stack underflow (-2) -e: compile error (SyntaxError) ``` proposed patch: https://github.com/ruby/ruby/pull/17449 every version since 3.4.0-preview2 is affected -- https://bugs.ruby-lang.org/

4 3

[ruby-core:125821] [Ruby Bug#22127] parse.y regexp crash on invalid encoding
by kddnewton (Kevin Newton) 09 Jul '26

09 Jul '26

Issue #22127 has been reported by kddnewton (Kevin Newton). ---------------------------------------- Bug #22127: parse.y regexp crash on invalid encoding https://bugs.ruby-lang.org/issues/22127 * Author: kddnewton (Kevin Newton) * Status: Open * Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- ``` ./ruby --parser=parse.y -e '/#{"\xcd"}/' ``` results in a segfault -- https://bugs.ruby-lang.org/

3 2

[ruby-core:125931] [Ruby Bug#22179] Coverage: redefined methods silently disappear from method Coverage.result after GC
by sferik (Erik Berlin) 09 Jul '26

09 Jul '26

Issue #22179 has been reported by sferik (Erik Berlin). ---------------------------------------- Bug #22179: Coverage: redefined methods silently disappear from method Coverage.result after GC https://bugs.ruby-lang.org/issues/22179 * Author: sferik (Erik Berlin) * Status: Open * Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- When method coverage is enabled, a method that has been redefined vanishes from `Coverage.result` once GC runs. It is not reported as uncovered (count 0), it is missing altogether, so the set of methods reported for a file changes nondeterministically depending on GC timing. ##### Reproduction target.rb: ```ruby def foo 1 end def foo 2 end foo ``` run.rb: ```ruby require "coverage" Coverage.start(methods: true) require_relative "./target" GC.start if ENV["FORCE_GC"] pp Coverage.result.find { |f, _| f.end_with?("target.rb") }.last[:methods] ``` Without GC, both definitions are reported: ``` $ ruby run.rb {[Object, :foo, 5, 0, 7, 3] => 1, [Object, :foo, 1, 0, 3, 3] => 0} ``` With a GC before `Coverage.result`, the first definition is gone: ``` $ FORCE_GC=1 ruby run.rb {[Object, :foo, 5, 0, 7, 3] => 1} ``` The explicit `GC.start` is only for determinism. In real programs any GC that happens to run between the redefinition and `Coverage.result` has the same effect, which is how this was noticed in the wild. I’ve looked into why this is happening and I believe it's because method coverage is not stored per file the way line and branch coverage are, it's reconstructed at result time by walking the heap for method entries (`method_coverage_i` via `rb_objspace_each_objects` in ext/coverage/coverage.c). A shadowed definition that was never called has no entry in `me2counter` and exists only as a garbage method entry after redefinition, so once GC collects it, the heap walk cannot see it and the definition is silently forgotten. This issue was discovered when it was reported as [a bug in SimpleCov](https://github.com/simplecov-ruby/simplecov/issues/1217), of which I am a maintainer. Reproduced on 3.2.11, 3.3.11, 3.4.10, and 4.0.5. -- https://bugs.ruby-lang.org/

2 2

[ruby-core:125986] [Ruby Misc#22180] Provide official Windows (mswin) binary packages and a version manager
by naruse (Yui NARUSE) 09 Jul '26

09 Jul '26

Issue #22180 has been updated by naruse (Yui NARUSE). > It looks like packaging vcruntime140.dll is dubious... vcruntime is a part of libc on Windows and Visual C++. Though libc on Unix usually consists from a single binary, Windows separates it into Universal CRT and VCRuntime. ucrt provides main part of libc, and VCRuntime provides C compiler related things for example exception hendling and so on. Just remove vcruntime140.dll and assume the user installed VC++ Redistributable package is rather reasonable. ---------------------------------------- Misc #22180: Provide official Windows (mswin) binary packages and a version manager https://bugs.ruby-lang.org/issues/22180#change-117963 * Author: hsbt (Hiroshi SHIBATA) * Status: Assigned * Assignee: hsbt (Hiroshi SHIBATA) ---------------------------------------- Japanese version of this proposal: https://gist.github.com/hsbt/552b01f2aac616af6f8056148407900a ## Background Ruby used to ship official Windows binaries. https://ftp.ruby-lang.org/pub/ruby/binaries/mswin32/ still has mswin32 zips from the 1.6 to 1.9-preview era, and they were discontinued around 1.9. One reason is that a bare zip was not usable as a distribution. https://bugs.ruby-lang.org/issues/999 reports that the `ruby-1.9.1-preview1` mswin32 zip was missing the OpenSSL and zlib DLLs, so `gem update` did not work at all. Since then, installing Ruby on Windows has depended on third-party distributions. The mswin platform, which is what `ruby/ruby` CI actually builds and tests with MSVC, has had no end-user distribution at all. https://bugs.ruby-lang.org/issues/19325 shows how the current state is perceived by Windows users. The technical ground has changed. Over the last few months I fixed all the tests that remained broken on mswin myself: `nmake check`, `test-bundler` and `test-bundled-gems` are green now, and `nmake exam`, which runs all of the test suites, completes as well. The build manages its C dependencies with a pinned vcpkg manifest (`vcpkg.json`), and CI covers VS 2022, VS 2026 and `windows-11-arm`. MSVC ABI (`vcruntime140`) has been stable since 2015. The missing piece is distribution, not build quality. Timing also matters. In the era of writing code with AI, the people who need a working Ruby on Windows are increasingly ordinary users who let a coding assistant set up the environment for them, and consumer AI tools operate natively on Windows, not through WSL. An assistant working unattended needs a runtime that installs without elevation and without GUI dialogs, exposes a machine-readable version index, and is relocatable so that installs are deterministic. Unattended provisioning is already the norm in CI (`setup-ruby` exists precisely for this), and AI assistants bring the same requirement to end-user machines. Python reached the same conclusion with PEP 773, described below. Ruby has no official answer to this on Windows today. ## Proposal I propose to provide an official Windows distribution based on the mswin platform, made of three components. All of them, including the test-suite fixes above, are work I implemented and verified myself. Nothing below is a design on paper. **1. `ruby/ruby`: a `binary-package` target.** A new nmake-only target packages the installed tree together with the vcpkg runtime DLLs, the VC runtime and the license terms of everything redistributed into a relocatable zip, with build-machine specific paths scrubbed from `rbconfig.rb`. Thanks to `LOAD_RELATIVE` the tree runs from any location. I will submit the pull request shortly. This is implemented and verified. The package passes a smoke test with `PATH` restricted to `System32` (openssl, fiddle, psych, zlib and RubyGems all work), and C extensions compile with VS Build Tools. In a survey of the 500 most-downloaded gems on rubygems.org forced to build from source, 21 of the 44 gems with a native extension built and loaded. All 23 failures were gem-side or environment-side issues (gcc-only code, POSIX-only source, missing third-party libraries), none caused by the package or by ruby itself, with identical results on 3.3.11, 3.4.10 and 4.0.5. **2. `ruby/actions`: building and publishing.** Automation builds the zips and publishes them together with sha256 checksums: daily builds of master and release builds of the maintained series. Released series (3.3, 3.4, 4.0) are built from their release tarballs with the same packaging script applied externally, so no change to the stable branches is required. This also enables re-packaging revisions (`-1`, `-2`) when a bundled dependency such as OpenSSL needs a security update without a new Ruby release. This part is already working too: in addition to master, zips of 3.3.11, 3.4.10 and 4.0.5 have been built and verified this way, and they are the packages the gem survey above was run on. **3. `rbmanager`: a version manager for Windows.** The same shape as Python's install manager (PEP 773, https://peps.python.org/pep-0773/) A single native executable (the `rb` command) installs a zip from a URL or a local path, extracts it under `%LOCALAPPDATA%`, switches versions with an NTFS junction, and needs one user-level `PATH` entry and no elevation. A working prototype written in C# is already complete and verified on a real machine: ``` > rb install ruby-4.1.0-x64-mswin64_140.zip Extracting ruby-4.1.0-x64-mswin64_140 ... Installed ruby-4.1.0-x64-mswin64_140 > ruby -v ruby 4.1.0dev (2026-06-29T22:22:44Z master 2ce6b8e54a) +PRISM [x64-mswin64_140] > rb list ruby-3.3.11-x64-mswin64_140 ruby-3.4.10-x64-mswin64_140 ruby-4.0.5-x64-mswin64_140 * ruby-4.1.0-x64-mswin64_140 > rb use 4.0 Now using ruby-4.0.5-x64-mswin64_140 > ruby -v ruby 4.0.5 (2026-05-20 revision 64336ffd0e) +PRISM [x64-mswin64_140] ``` The example installs from a local zip today. Once the official version index described below is published, `rb install 4.1` will resolve the version, download the zip and verify its checksum by itself. ## What building on the platform vendor's toolchain enables This proposal is complementary to the existing gcc-based distributions and does not compete with them. Some capabilities are decided by third-party vendors rather than by Ruby, because their SDKs assume the MSVC toolchain and ABI, and those become reachable with an official MSVC-built runtime. Machine-learning runtime assets become directly reusable: the prebuilt Windows packages of ONNX Runtime, libtorch and OpenCV are MSVC binaries with C++ ABIs, and CUDA's `nvcc` accepts only `cl.exe` as its host compiler on Windows, so Ruby extensions binding GPU and ML runtimes need an MSVC-built Ruby to link cleanly. PDB symbols connect Ruby to the standard Windows diagnostics stack: WinDbg and Visual Studio can debug a mixed stack of Ruby and vendor DLLs, WER minidumps from end users become analyzable, and publishing official symbol packages becomes possible for the first time. And extension authors can pull C dependencies from the same vcpkg ecosystem that `ruby/ruby` itself already uses through `vcpkg.json`. ## What I ask to decide First, make these official distribution artifacts: announce them on the www.ruby-lang.org download page and host the zips, checksums and a static version index (the equivalent of pymanager's `index-windows.json`) on ruby-lang.org infrastructure. GitHub Releases can serve as the initial hosting during the preview period. Second, sign the published binaries with a project identity (for example SignPath Foundation issues OSS code-signing certificates) rather than an individual certificate. Third, host `rbmanager` as a repository under the `ruby` organization. The concrete zip layout and naming rule are implementation details. I will work them out with @nobu and document the result in `doc/distribution/windows.md`, so they are not something to decide on this ticket. ## Scope and non-goals This proposal does not replace or deprecate any existing third-party distribution. It adds an official channel for the platform the core team itself builds and tests. I already operate the official snap distribution and the entire release pipeline including security releases, and these artifacts ride on the same automation and the same operator, so this proposal does not change the current maintenance level. Pure-Ruby gems work with no toolchain. Building a C extension requires VS Build Tools, which Microsoft has licensed for building open-source dependencies without a paid Visual Studio license since 2022, and a `ridk`-like bootstrap (`win32/install-buildtools.cmd` is the seed) is follow-up work. Precompiled `x64-mswin64` gems across the ecosystem are long-term work and not a prerequisite. The survey above identified 12 gems that already support Windows with `x64-mingw-ucrt` precompiled binaries and only lack a working MSVC source path, a concrete and small upstream fix list. That list includes nokogiri and ffi, so applications depending on them (Rails, for example) do not work on this distribution yet. The fixes are tractable: I have already verified a one-line fix for msgpack locally and will send these upstream. TLS trust anchors are not bundled in the zip. `rbmanager` provisions certificates from the Windows certificate store at install time, and I will separately propose `OpenSSL::X509::Store#add_store` support for the OpenSSL 3.2+ `org.openssl.winstore://` store in ruby/openssl as the permanent solution. x64 comes first. arm64 (`arm64-mswin64`) already builds in CI and will follow once its test suite is green. ## Roadmap The rollout is incremental rather than tied to a single date. Zips for the released series (3.3, 3.4, 4.0) will be published progressively for their existing releases. For 4.1, nightly zips of master are published continuously, and a zip follows each preview release as soon as it is out. Only the GA of `rbmanager` and the distribution mechanism as a whole is aligned with the Ruby 4.1 release in December. -- https://bugs.ruby-lang.org/

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[ruby-core:123795] [Ruby Bug#21685] Unnecessary context-switching, especially bad on multi-core machines.
by jpl-coconut (Jacob Lacouture) 09 Jul '26

09 Jul '26

Issue #21685 has been reported by jpl-coconut (Jacob Lacouture). ---------------------------------------- Bug #21685: Unnecessary context-switching, especially bad on multi-core machines. https://bugs.ruby-lang.org/issues/21685 * Author: jpl-coconut (Jacob Lacouture) * Status: Open * ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [aarch64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- While debugging a performance issue in a large rails application, I wrote a minimal microbenchmark that reproduces the issue. [[here]](https://gist.github.com/jpl-coconut/cb3679ce885eb578e1071c4b3a525d5c) I was surprised to see that the benchmark takes ~3.6sec on a single-core machine, and ~36sec **(10x slower) on a machine with 2 or more cores** . Initially I thought this was a bug in the implementation of Thread::Queue, but soon realized it relates to how the ruby reschedules threads around system calls. I prepared a fix in [[this branch]](https://github.com/jpl-coconut/ruby/tree/deferred_thread_wait) which is based off ruby 3.4.7. I can apply the fix to a different branch or to master if that's helpful. The fix simply defers suspending the thread until the syscall has been running for some short interval. I chose 100usec initially, but this could easily be made configurable. I pasted raw benchmark results below from a single run (though I did many runs and the results are stable). My CPU is an Apple M4. After the fix: - Single-core performance improves by 55%, from 3.6sec to 2sec. - Adding cores causes performance to be flat (at 2sec), rather than getting 10x slower. - Multi-core context-switch count reduces by 99.995%, from 1.4 million to ~80 - system_time/user_time ratio drops from (1.2 - 1.6) to 0.65 Here are the benchmark results before my change: ``` # time taskset --cpu-list 1 ./ruby qtest_simple.rb voluntary_ctxt_switches: 1140773 nonvoluntary_ctxt_switches: 9487 real 0m3.619s user 0m1.653s sys 0m1.950s # time taskset --cpu-list 1,2 ./ruby qtest_simple.rb voluntary_ctxt_switches: 1400110 nonvoluntary_ctxt_switches: 3 real 0m36.223s user 0m9.380s sys 0m14.927s ``` And after: ``` # time taskset --cpu-list 1 ./ruby qtest_simple.rb voluntary_ctxt_switches: 88 nonvoluntary_ctxt_switches: 899 real 0m2.031s user 0m1.209s sys 0m0.743s # time taskset --cpu-list 1,2 ./ruby qtest_simple.rb voluntary_ctxt_switches: 75 nonvoluntary_ctxt_switches: 8 real 0m2.062s user 0m1.279s sys 0m0.783s ``` I was concerned these results might still be reflective of a bug in Thread::Queue, so I also came up with a repro that doesn't rely on it. That one is [[here]](https://gist.github.com/jpl-coconut/aa14e59354abf98f808daaf39baa9a72). Results summary: - Single-core performance improves (this time by only 30%) - Multi-core penalty drops from 4x to 0. - No change to context-switching rates. - system_time/user_time ratio drops from (0.5-1) to 0.15 Before fix: ``` # time taskset --cpu-list 1 ./ruby mbenchmark.rb voluntary_ctxt_switches: 60 real 0m0.336s user 0m0.211s sys 0m0.118s # time taskset --cpu-list 1,2 ./ruby mbenchmark.rb voluntary_ctxt_switches: 60 real 0m1.424s user 0m0.468s sys 0m0.496s ``` After fix: ``` # time taskset --cpu-list 1 ./ruby mbenchmark.rb voluntary_ctxt_switches: 59 real 0m0.241s user 0m0.202s sys 0m0.032s # time taskset --cpu-list 1,2 ./ruby mbenchmark.rb voluntary_ctxt_switches: 60 real 0m0.238s user 0m0.195s sys 0m0.035s ``` -- https://bugs.ruby-lang.org/

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[ruby-core:111678] [Ruby master Feature#19315] Lazy substrings in CRuby
by Eregon (Benoit Daloze) 08 Jul '26

08 Jul '26

Issue #19315 has been reported by Eregon (Benoit Daloze). ---------------------------------------- Feature #19315: Lazy substrings in CRuby https://bugs.ruby-lang.org/issues/19315 * Author: Eregon (Benoit Daloze) * Status: Open * Priority: Normal ---------------------------------------- CRuby should implement lazy substrings, i.e., "abcdef"[1..3] must not copy bytes. Currently CRuby only reuse the char* if the substring is until the end of the buffer. But it should also work wherever the substring starts and ends. Yes, it means RSTRING_PTR() might need to allocate to \0-terminate, so be it, it's worth it. There is already code for this (`SHARABLE_MIDDLE_SUBSTRING`), but it's disabled by default and `RSTRING_PTR()` needs to be changed to deal with this. It seems a good idea to introduce a variant of `RSTRING_PTR` which doesn't guarantee \0-termination, so such callers can then use the existing bytes always without copy. There are countless workarounds for this missing optimization, all not worth and all less readable: * https://bugs.ruby-lang.org/issues/19314 * https://github.com/ruby/net-protocol/pull/14 * Manual lazy substrings which track string + index + length * More but I don't remember all now, feel free to comment or link more urls/tickets. -- https://bugs.ruby-lang.org/

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[ruby-core:125714] [Ruby Misc#22107] DevMeeting-2026-07-09
by mame (Yusuke Endoh) 08 Jul '26

08 Jul '26

Issue #22107 has been reported by mame (Yusuke Endoh). ---------------------------------------- Misc #22107: DevMeeting-2026-07-09 https://bugs.ruby-lang.org/issues/22107 * Author: mame (Yusuke Endoh) * Status: Open ---------------------------------------- # The next dev meeting **Date: 2026/07/09 13:00-17:00** (JST) Log: *TBD* - Dev meeting *IS NOT* a decision-making place. All decisions should be done at the bug tracker. - Dev meeting is a place we can ask Matz, nobu, nurse and other developers directly. - Matz is a very busy person. Take this opportunity to ask him. If you can not attend, other attendees can ask instead of you (if attendees can understand your issue). - We will write a record of the discussion in the file or to each ticket in English. - All activities are best-effort (keep in mind that most of us are volunteer developers). - The date, time and place of the meeting are scheduled according to when/where we can reserve Matz's time. - *DO NOT* discuss then on this ticket, please. # Call for agenda items If you have a ticket that you want matz and committers to discuss, please post it into this ticket in the following format: ``` * [Ticket ref] Ticket title (your name) * Comment (A summary of the ticket, why you put this ticket here, what point should be discussed, etc.) ``` Example: ``` * [Feature #14609] `Kernel#p` without args shows the receiver (ko1) * I feel this feature is very useful and some people say :+1: so let discuss this feature. ``` - It is recommended to add a comment by 2026/07/06. We hold a preparatory meeting to create an agenda a few days before the dev-meeting. - The format is strict. We'll use [this script to automatically create an markdown-style agenda](https://gist.github.com/mame/b0390509ce1491b43610b9ebb665eb86). We may ignore a comment that does not follow the format. - Your comment is mandatory. We cannot read all discussion of the ticket in a limited time. We appreciate it if you could write a short summary and update from a previous discussion. -- https://bugs.ruby-lang.org/

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