500 error when fetching dependencies on some projects

Summary

When accessing certain projects, accessing the Dependency List produces the error screen rather than the empty state, or some other 'successful' state.

The only thing these projects seem to have in common is that they have no successful pipelines, or no pipelines at all. Any project that has at least one successful pipeline seems to behave as expected.

This is the trace of the error:

NoMethodError at /root/mandelbrot/security/dependencies
=======================================================

> undefined method `builds' for nil:NilClass

ee/app/controllers/projects/security/dependencies_controller.rb, line 20
------------------------------------------------------------------------

   15         end
   16   
   17         private
   18   
   19         def build
>  20           @build ||= pipeline.builds.latest
   21                     .with_reports(::Ci::JobArtifact.dependency_list_reports)
   22                     .last
   23         end
   24   
   25         def ensure_dependency_list_feature_available


App backtrace
-------------

 - ee/app/controllers/projects/security/dependencies_controller.rb:20:in `build'
 - ee/app/controllers/projects/security/dependencies_controller.rb:30:in `dependencies'
 - ee/app/controllers/projects/security/dependencies_controller.rb:34:in `paginated_dependencies'
 - ee/app/controllers/projects/security/dependencies_controller.rb:12:in `block (2 levels) in index'
 - ee/app/controllers/projects/security/dependencies_controller.rb:9:in `index'
 - lib/gitlab/session.rb:11:in `with_session'
 - app/controllers/application_controller.rb:445:in `set_session_storage'
 - lib/gitlab/i18n.rb:55:in `with_locale'
 - lib/gitlab/i18n.rb:61:in `with_user_locale'
 - app/controllers/application_controller.rb:439:in `set_locale'
 - lib/gitlab/middleware/rails_queue_duration.rb:27:in `call'
 - lib/gitlab/metrics/rack_middleware.rb:17:in `block in call'
 - lib/gitlab/metrics/transaction.rb:57:in `run'
 - lib/gitlab/metrics/rack_middleware.rb:17:in `call'
 - lib/gitlab/middleware/multipart.rb:103:in `call'
 - lib/gitlab/request_profiler/middleware.rb:16:in `call'
 - lib/gitlab/query_limiting/middleware.rb:17:in `block in call'
 - lib/gitlab/query_limiting/transaction.rb:39:in `run'
 - lib/gitlab/query_limiting/middleware.rb:16:in `call'
 - ee/lib/gitlab/jira/middleware.rb:17:in `call'
 - lib/gitlab/middleware/go.rb:20:in `call'
 - lib/gitlab/etag_caching/middleware.rb:13:in `call'
 - lib/gitlab/middleware/correlation_id.rb:16:in `block in call'
 - lib/gitlab/middleware/correlation_id.rb:15:in `call'
 - lib/gitlab/middleware/read_only/controller.rb:42:in `call'
 - lib/gitlab/middleware/read_only.rb:18:in `call'
 - lib/gitlab/middleware/basic_health_check.rb:25:in `call'
 - lib/gitlab/request_context.rb:26:in `call'
 - lib/gitlab/middleware/static.rb:11:in `call'
 - lib/gitlab/webpack/dev_server_middleware.rb:27:in `perform_request'
 - lib/gitlab/metrics/requests_rack_middleware.rb:29:in `call'
 - lib/gitlab/middleware/release_env.rb:12:in `call'

Full backtrace
--------------

 - ee/app/controllers/projects/security/dependencies_controller.rb:20:in `build'
 - ee/app/controllers/projects/security/dependencies_controller.rb:30:in `dependencies'
 - ee/app/controllers/projects/security/dependencies_controller.rb:34:in `paginated_dependencies'
 - ee/app/controllers/projects/security/dependencies_controller.rb:12:in `block (2 levels) in index'
 - actionpack (5.1.7) lib/action_controller/metal/mime_responds.rb:201:in `respond_to'
 - ee/app/controllers/projects/security/dependencies_controller.rb:9:in `index'
 - actionpack (5.1.7) lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action'
 - actionpack (5.1.7) lib/abstract_controller/base.rb:186:in `process_action'
 - actionpack (5.1.7) lib/action_controller/metal/rendering.rb:30:in `process_action'
 - actionpack (5.1.7) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
 - activesupport (5.1.7) lib/active_support/callbacks.rb:108:in `block in run_callbacks'
 - lib/gitlab/session.rb:11:in `with_session'
 - app/controllers/application_controller.rb:445:in `set_session_storage'
 - activesupport (5.1.7) lib/active_support/callbacks.rb:117:in `block in run_callbacks'
 - lib/gitlab/i18n.rb:55:in `with_locale'
 - lib/gitlab/i18n.rb:61:in `with_user_locale'
 - app/controllers/application_controller.rb:439:in `set_locale'
 - activesupport (5.1.7) lib/active_support/callbacks.rb:117:in `block in run_callbacks'
 - sentry-raven (2.9.0) lib/raven/integrations/rails/controller_transaction.rb:7:in `block in included'
 - activesupport (5.1.7) lib/active_support/callbacks.rb:117:in `block in run_callbacks'
 - activesupport (5.1.7) lib/active_support/callbacks.rb:135:in `run_callbacks'
 - actionpack (5.1.7) lib/abstract_controller/callbacks.rb:19:in `process_action'
 - actionpack (5.1.7) lib/action_controller/metal/rescue.rb:20:in `process_action'
 - actionpack (5.1.7) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
 - activesupport (5.1.7) lib/active_support/notifications.rb:166:in `block in instrument'
 - activesupport (5.1.7) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
 - activesupport (5.1.7) lib/active_support/notifications.rb:166:in `instrument'
 - actionpack (5.1.7) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
 - actionpack (5.1.7) lib/action_controller/metal/params_wrapper.rb:252:in `process_action'
 - activerecord (5.1.7) lib/active_record/railties/controller_runtime.rb:22:in `process_action'
 - actionpack (5.1.7) lib/abstract_controller/base.rb:124:in `process'
 - actionview (5.1.7) lib/action_view/rendering.rb:30:in `process'
 - actionpack (5.1.7) lib/action_controller/metal.rb:189:in `dispatch'
 - actionpack (5.1.7) lib/action_controller/metal.rb:253:in `dispatch'
 - actionpack (5.1.7) lib/action_dispatch/routing/route_set.rb:49:in `dispatch'
 - actionpack (5.1.7) lib/action_dispatch/routing/route_set.rb:31:in `serve'
 - actionpack (5.1.7) lib/action_dispatch/routing/mapper.rb:16:in `block in <class:Constraints>'
 - actionpack (5.1.7) lib/action_dispatch/routing/mapper.rb:46:in `serve'
 - actionpack (5.1.7) lib/action_dispatch/journey/router.rb:50:in `block in serve'
 - actionpack (5.1.7) lib/action_dispatch/journey/router.rb:33:in `serve'
 - actionpack (5.1.7) lib/action_dispatch/routing/route_set.rb:844:in `call'
 - lib/gitlab/middleware/rails_queue_duration.rb:27:in `call'
 - lib/gitlab/metrics/rack_middleware.rb:17:in `block in call'
 - lib/gitlab/metrics/transaction.rb:57:in `run'
 - lib/gitlab/metrics/rack_middleware.rb:17:in `call'
 - lib/gitlab/middleware/multipart.rb:103:in `call'
 - lib/gitlab/request_profiler/middleware.rb:16:in `call'
 - lib/gitlab/query_limiting/middleware.rb:17:in `block in call'
 - lib/gitlab/query_limiting/transaction.rb:39:in `run'
 - lib/gitlab/query_limiting/middleware.rb:16:in `call'
 - ee/lib/gitlab/jira/middleware.rb:17:in `call'
 - lib/gitlab/middleware/go.rb:20:in `call'
 - lib/gitlab/etag_caching/middleware.rb:13:in `call'
 - gitlab-labkit (0.2.0) lib/labkit/tracing/rack_middleware.rb:26:in `block in call'
 - gitlab-labkit (0.2.0) lib/labkit/tracing/tracing_utils.rb:20:in `with_tracing'
 - gitlab-labkit (0.2.0) lib/labkit/tracing/rack_middleware.rb:25:in `call'
 - lib/gitlab/middleware/correlation_id.rb:16:in `block in call'
 - gitlab-labkit (0.2.0) lib/labkit/correlation/correlation_id.rb:18:in `use_id'
 - lib/gitlab/middleware/correlation_id.rb:15:in `call'
 - batch-loader (1.4.0) lib/batch_loader/middleware.rb:11:in `call'
 - apollo_upload_server (2.0.0.beta.3) lib/apollo_upload_server/middleware.rb:20:in `call'
 - rack-attack (4.4.1) lib/rack/attack.rb:107:in `call'
 - warden (1.2.7) lib/warden/manager.rb:36:in `block in call'
 - warden (1.2.7) lib/warden/manager.rb:35:in `call'
 - rack-cors (1.0.2) lib/rack/cors.rb:97:in `call'
 - rack (2.0.7) lib/rack/etag.rb:25:in `call'
 - rack (2.0.7) lib/rack/conditional_get.rb:25:in `call'
 - rack (2.0.7) lib/rack/head.rb:12:in `call'
 - lib/gitlab/middleware/read_only/controller.rb:42:in `call'
 - lib/gitlab/middleware/read_only.rb:18:in `call'
 - rack (2.0.7) lib/rack/session/abstract/id.rb:232:in `context'
 - rack (2.0.7) lib/rack/session/abstract/id.rb:226:in `call'
 - actionpack (5.1.7) lib/action_dispatch/middleware/cookies.rb:613:in `call'
 - activerecord (5.1.7) lib/active_record/migration.rb:556:in `call'
 - actionpack (5.1.7) lib/action_dispatch/middleware/callbacks.rb:26:in `block in call'
 - activesupport (5.1.7) lib/active_support/callbacks.rb:97:in `run_callbacks'
 - actionpack (5.1.7) lib/action_dispatch/middleware/callbacks.rb:24:in `call'
 - actionpack (5.1.7) lib/action_dispatch/middleware/executor.rb:12:in `call'
 - better_errors (2.5.0) lib/better_errors/middleware.rb:84:in `protected_app_call'
 - better_errors (2.5.0) lib/better_errors/middleware.rb:79:in `better_errors_call'
 - better_errors (2.5.0) lib/better_errors/middleware.rb:57:in `call'
 - actionpack (5.1.7) lib/action_dispatch/middleware/debug_exceptions.rb:59:in `call'
 - actionpack (5.1.7) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
 - lib/gitlab/middleware/basic_health_check.rb:25:in `call'
 - railties (5.1.7) lib/rails/rack/logger.rb:36:in `call_app'
 - railties (5.1.7) lib/rails/rack/logger.rb:24:in `block in call'
 - activesupport (5.1.7) lib/active_support/tagged_logging.rb:69:in `block in tagged'
 - activesupport (5.1.7) lib/active_support/tagged_logging.rb:26:in `tagged'
 - activesupport (5.1.7) lib/active_support/tagged_logging.rb:69:in `tagged'
 - railties (5.1.7) lib/rails/rack/logger.rb:24:in `call'
 - sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:13:in `call'
 - actionpack (5.1.7) lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
 - lib/gitlab/request_context.rb:26:in `call'
 - request_store (1.3.1) lib/request_store/middleware.rb:9:in `call'
 - actionpack (5.1.7) lib/action_dispatch/middleware/request_id.rb:25:in `call'
 - rack (2.0.7) lib/rack/method_override.rb:22:in `call'
 - rack (2.0.7) lib/rack/runtime.rb:22:in `call'
 - actionpack (5.1.7) lib/action_dispatch/middleware/executor.rb:12:in `call'
 - actionpack (5.1.7) lib/action_dispatch/middleware/static.rb:125:in `call'
 - lib/gitlab/middleware/static.rb:11:in `call'
 - lib/gitlab/webpack/dev_server_middleware.rb:27:in `perform_request'
 - rack-proxy (0.6.0) lib/rack/proxy.rb:57:in `call'
 - rack (2.0.7) lib/rack/sendfile.rb:111:in `call'
 - lib/gitlab/metrics/requests_rack_middleware.rb:29:in `call'
 - sentry-raven (2.9.0) lib/raven/integrations/rack.rb:51:in `call'
 - railties (5.1.7) lib/rails/engine.rb:522:in `call'
 - railties (5.1.7) lib/rails/railtie.rb:185:in `method_missing'
 - lib/gitlab/middleware/release_env.rb:12:in `call'
 - rack (2.0.7) lib/rack/urlmap.rb:68:in `block in call'
 - rack (2.0.7) lib/rack/urlmap.rb:53:in `call'
 - unicorn (5.4.1) lib/unicorn/http_server.rb:606:in `process_client'
 - unicorn (5.4.1) lib/unicorn/http_server.rb:701:in `worker_loop'
 - unicorn (5.4.1) lib/unicorn/http_server.rb:549:in `spawn_missing_workers'
 - unicorn (5.4.1) lib/unicorn/http_server.rb:142:in `start'
 - unicorn (5.4.1) bin/unicorn_rails:209:in `<top (required)>'
 -  () home/markrian/.gem/ruby/2.6.3/bin/unicorn_rails:23:in `<top (required)>'
 - /home/markrian/.rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/cli/exec.rb:74:in `kernel_load'
 - /home/markrian/.rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/cli/exec.rb:28:in `run'
 - /home/markrian/.rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/cli.rb:463:in `exec'
 - /home/markrian/.rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
 - /home/markrian/.rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
 - /home/markrian/.rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
 - /home/markrian/.rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/cli.rb:27:in `dispatch'
 - /home/markrian/.rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
 - /home/markrian/.rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/cli.rb:18:in `start'
 - bundler (1.17.2) exe/bundle:30:in `block in <top (required)>'
 - /home/markrian/.rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/friendly_errors.rb:124:in `with_friendly_errors'
 - bundler (1.17.2) exe/bundle:22:in `<top (required)>'
 - /home/markrian/.rubies/ruby-2.6.3/bin/bundle:23:in `<main>'

Steps to reproduce

TODO

(How one can reproduce the issue - this is very important)

Example Project

TODO

(If possible, please create an example project here on GitLab.com that exhibits the problematic behavior, and link to it here in the bug report)

(If you are using an older version of GitLab, this will also determine whether the bug is fixed in a more recent version)

What is the current bug behavior?

TODO

(What actually happens)

What is the expected correct behavior?

TODO

(What you should see instead)

Relevant logs and/or screenshots

TODO

(Paste any relevant logs - please use code blocks (```) to format console output, logs, and code as it's tough to read otherwise.)

Output of checks

(If you are reporting a bug on GitLab.com, write: This bug happens on GitLab.com)

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:env:info)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)

cc @brytannia

Edited Jun 10, 2019 by Mark Florian