Issue #21802 has been updated by ufuk (Ufuk Kayserilioglu). Please post the C level backtrace as well. Usually that's very helpful. ---------------------------------------- Bug #21802: segmentation fault when installing gems on CI https://bugs.ruby-lang.org/issues/21802#change-115864 * Author: luizkowalski (Luiz Kowalski) * Status: Open * ruby -v: ruby 3.4.8 (2025-12-17 revision 995b59f666) +YJIT +PRISM [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- hey! recently, we updated to Bundler v4 (currently running v4.0.3) and Ruby 3.4.8. Since then, one of our CircleCI steps has been failing repeatedly, often without logs. Sometimes it does fail with a log ``` Installing faraday-typhoeus 1.1.0 Fetching http 5.3.1 /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:369: [BUG] Segmentation fault at 0x00007f336df8c100 ruby 3.4.8 (2025-12-17 revision 995b59f666) +PRISM [x86_64-linux] -- Control frame information ----------------------------------------------- c:0026 p:---- s:0142 e:000141 CFUNC :each_value c:0025 p:0078 s:0138 e:000137 METHOD /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:369 c:0024 p:0030 s:0131 e:000130 METHOD /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:678 c:0023 p:0005 s:0125 e:000124 BLOCK /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:697 c:0022 p:0053 s:0121 e:000120 METHOD /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package/tar_reader.rb:67 c:0021 p:0005 s:0114 e:000113 METHOD /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:696 c:0020 p:0011 s:0108 e:000107 BLOCK /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:626 c:0019 p:0020 s:0104 e:000103 METHOD /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package/tar_reader.rb:25 c:0018 p:0007 s:0098 e:000097 BLOCK /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:623 [FINISH] c:0017 p:---- s:0094 e:000093 CFUNC :open c:0016 p:0013 s:0088 e:000087 METHOD /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package/file_source.rb:30 c:0015 p:0015 s:0083 e:000082 METHOD /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:622 c:0014 p:0008 s:0078 e:000077 METHOD /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:603 c:0013 p:0005 s:0074 e:000073 METHOD /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/installer.rb:254 c:0012 p:0020 s:0070 e:000069 METHOD /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/rubygems_gem_installer.rb:140 c:0011 p:0196 s:0066 e:000065 METHOD /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/source/rubygems.rb:195 c:0010 p:0025 s:0052 e:000051 METHOD /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/installer/gem_installer.rb:54 c:0009 p:0003 s:0048 e:000047 METHOD /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/installer/gem_installer.rb:17 c:0008 p:0037 s:0042 e:000041 METHOD /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/installer/parallel_installer.rb:133 c:0007 p:0007 s:0033 e:000032 BLOCK /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/installer/parallel_installer.rb:124 c:0006 p:0009 s:0028 e:000027 METHOD /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/worker.rb:62 c:0005 p:0030 s:0021 e:000019 BLOCK /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/worker.rb:57 c:0004 p:0017 s:0016 e:000015 METHOD <internal:kernel>:168 c:0003 p:0004 s:0011 e:000010 METHOD /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/worker.rb:54 c:0002 p:0005 s:0006 e:000005 BLOCK /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/worker.rb:90 [FINISH] c:0001 p:---- s:0003 e:000002 DUMMY [FINISH] -- Ruby level backtrace information ---------------------------------------- /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/worker.rb:90:in 'block (2 levels) in create_threads' /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/worker.rb:54:in 'process_queue' <internal:kernel>:168:in 'loop' /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/worker.rb:57:in 'block in process_queue' /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/worker.rb:62:in 'apply_func' /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/installer/parallel_installer.rb:124:in 'block in worker_pool' /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/installer/parallel_installer.rb:133:in 'do_install' /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/installer/gem_installer.rb:17:in 'install_from_spec' /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/installer/gem_installer.rb:54:in 'install' /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/source/rubygems.rb:195:in 'install' /home/circleci/.rubygems/gems/bundler-4.0.2/lib/bundler/rubygems_gem_installer.rb:140:in 'spec' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/installer.rb:254:in 'spec' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:603:in 'spec' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:622:in 'verify' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package/file_source.rb:30:in 'with_read_io' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package/file_source.rb:30:in 'open' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:623:in 'block in verify' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package/tar_reader.rb:25:in 'new' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:626:in 'block (2 levels) in verify' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:696:in 'verify_files' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package/tar_reader.rb:67:in 'each' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:697:in 'block in verify_files' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:678:in 'verify_entry' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:369:in 'digest' /usr/*****/lib/ruby/site_ruby/3.4.0/rubygems/package.rb:369:in 'each_value' -- Threading information --------------------------------------------------- Total ractor count: 1 Ruby thread count for this ractor: 44 -- Machine register context ------------------------------------------------ RIP: 0x00007f336df8bffe RBP: 0x00007f333dd38270 RSP: 0x00007f333dd38190 RAX: 0x00007f336df8c100 RBX: 0x000055fb7a768350 RCX: 0x000055fb7956d330 RDX: 0x0000000000000000 RDI: 0x00007f336e501740 RSI: 0x0000000000000000 R8: 0x0000000000000003 R9: 0x000055fb7fd9ab78 R10: 0x0000000055550083 R11: 0x000055fb7fe9a1c1 R12: 0x00007f328c55e568 R13: 0x00007f328c55e568 R14: 0x000055fb7fe9a1a8 R15: 0x0000000000000000 EFL: 0x0000000000010202 -- C level backtrace information ------------------------------------------- /bin/bash: line 5: 1060 Killed bundle install ``` while trying to find the root cause, I noticed that **rolling back to Ruby 3.4.7 solves the issue** . there's not a lot going on with the CI step, too: ```yaml verify-contract: docker: - image: cimg/ruby:3.4.8-node environment: RAILS_ENV: test MYSQL_HOST: 127.0.0.1 MYSQL_STATSDB_HOST: 127.0.0.1 CONTRACT_URL: << pipeline.parameters.contract_url >> CONSUMER_NAME: << pipeline.parameters.consumer_name >> CONSUMER_VERSION: << pipeline.parameters.consumer_version >> PROVIDER_VERSION: << pipeline.parameters.provider_version >> PUBLISH_VERIFICATION_RESULTS: true DYNAMODB_AWS_REGION: us-east-1 DYNAMODB_AWS_ACCESS_KEY_ID: local DYNAMODB_AWS_SECRET_ACCESS_KEY: local DYNAMODB_AWS_ENDPOINT: http://dynamodb:8000 - image: cimg/mysql:8.0.42 environment: MYSQL_ALLOW_EMPTY_PASSWORD: 1 - image: cimg/redis:8.4.0 - image: amazon/dynamodb-local:latest name: dynamodb command: ["-jar", "DynamoDBLocal.jar", "-sharedDb"] steps: - checkout - vault/get-secrets: template-preset: "ruby-gem-read" - run: name: Install bundler command: | gem install bundler - run: name: Ruby Environment Information command: | gem env bundle config - run: name: Install deps and verify contracts command: | if [ ! -z "${PROVIDER_VERSION}" ]; then git checkout ${PROVIDER_VERSION} fi bundle config https://rubygems.pkg.github.com/xxxxx "${RUBYGEMS_USER}:${RUBYGEMS_PASSWORD}" bundle install bundle clean --force bundle exec rake database:recreate_all if [[ -z "$CONTRACT_URL" ]]; then bundle exec rake pact:verify else bundle exec rake pact:verify:at[$CONTRACT_URL] || true fi ``` -- https://bugs.ruby-lang.org/