Rack::Timeout::RequestTimeoutException while adding new note/issue (comment)

Summary

Trying to post new issue or comment to issue with ~157000 chars (which is less than documented 1M limit) causes Rack::Timeout::RequestTimeoutException.
Example note attached.

Steps to reproduce

1. Copy text from attached note.
2. Try to add new comment to issue or fill new issue with copyed text.

Example text

packages-2020-09-22-1600780485.559266.txt

What is the current bug behavior?

HTTP/500 error due to Rack::Timeout::RequestTimeoutException.

What is the expected correct behavior?

Note is posted.

Relevant logs and/or screenshots

New issue backtrace:

Rack::Timeout::RequestTimeoutException (Request ran for longer than 60000ms):
 
lib/gitlab/quick_actions/extractor.rb:166:in `gsub'
lib/gitlab/quick_actions/extractor.rb:166:in `block in perform_substitutions'
lib/gitlab/quick_actions/extractor.rb:164:in `each'
lib/gitlab/quick_actions/extractor.rb:164:in `perform_substitutions'
lib/gitlab/quick_actions/extractor.rb:40:in `extract_commands'
app/services/quick_actions/interpret_service.rb:43:in `execute'
lib/gitlab/metrics/instrumentation.rb:161:in `block in execute'
lib/gitlab/metrics/method_call.rb:36:in `measure'
lib/gitlab/metrics/instrumentation.rb:161:in `execute'
app/services/issuable_base_service.rb:127:in `merge_quick_actions_into_params!'
app/services/issuable_base_service.rb:119:in `handle_quick_actions'
app/services/issuable_base_service.rb:140:in `create'
app/services/issues/create_service.rb:14:in `execute'
lib/gitlab/metrics/instrumentation.rb:161:in `block in execute'
lib/gitlab/metrics/method_call.rb:36:in `measure'
lib/gitlab/metrics/instrumentation.rb:161:in `execute'
app/controllers/projects/issues_controller.rb:117:in `create'
app/controllers/application_controller.rb:491:in `set_current_admin'
lib/gitlab/session.rb:11:in `with_session'
app/controllers/application_controller.rb:482: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:476:in `set_locale'
lib/gitlab/error_tracking.rb:50:in `with_context'
app/controllers/application_controller.rb:541:in `sentry_context'
app/controllers/application_controller.rb:469:in `block in set_current_context'
lib/gitlab/application_context.rb:52:in `block in use'
lib/gitlab/application_context.rb:52:in `use'
lib/gitlab/application_context.rb:20:in `with_context'
app/controllers/application_controller.rb:462:in `set_current_context'
lib/gitlab/metrics/elasticsearch_rack_middleware.rb:24:in `call'
lib/gitlab/metrics/redis_rack_middleware.rb:22:in `call'
lib/gitlab/middleware/rails_queue_duration.rb:29:in `call'
lib/gitlab/metrics/rack_middleware.rb:17:in `block in call'
lib/gitlab/metrics/transaction.rb:54:in `run'
lib/gitlab/metrics/rack_middleware.rb:17:in `call'
lib/gitlab/request_profiler/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/multipart.rb:140:in `call'
lib/gitlab/middleware/read_only/controller.rb:51:in `call'
lib/gitlab/middleware/read_only.rb:18:in `call'
lib/gitlab/middleware/same_site_cookies.rb:27:in `call'
lib/gitlab/middleware/basic_health_check.rb:25:in `call'
lib/gitlab/middleware/handle_ip_spoof_attack_error.rb:25:in `call'
lib/gitlab/middleware/request_context.rb:23:in `call'
config/initializers/fix_local_cache_middleware.rb:9:in `call'
lib/gitlab/metrics/requests_rack_middleware.rb:60:in `call'
lib/gitlab/middleware/release_env.rb:12:in `call'

New comment backtrace:

Rack::Timeout::RequestTimeoutException (Request ran for longer than 60000ms):
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/quick_actions/extractor.rb:166:in `gsub'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/quick_actions/extractor.rb:166:in `block in perform_substitutions'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/quick_actions/extractor.rb:164:in `each'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/quick_actions/extractor.rb:164:in `perform_substitutions'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/quick_actions/extractor.rb:40:in `extract_commands'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/quick_actions/interpret_service.rb:43:in `execute'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `block in execute'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/method_call.rb:36:in `measure'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `execute'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/notes/quick_actions_service.rb:44:in `execute'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/notes/create_service.rb:42:in `execute_quick_actions'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/notes/create_service.rb:21:in `execute'
  /opt/gitlab/embedded/service/gitlab-rails/lib/api/helpers/notes_helpers.rb:126:in `create_note'
  /opt/gitlab/embedded/service/gitlab-rails/lib/api/notes.rb:85:in `block (3 levels) in <class:Notes>'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/endpoint.rb:59:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/endpoint.rb:59:in `block (2 levels) in generate_api_method'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.1/lib/active_support/notifications.rb:182:in `instrument'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/endpoint.rb:58:in `block in generate_api_method'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/endpoint.rb:341:in `execute'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/endpoint.rb:267:in `block in run'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.1/lib/active_support/notifications.rb:182:in `instrument'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/endpoint.rb:247:in `run'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/endpoint.rb:322:in `block in build_stack'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/base.rb:35:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/base.rb:28:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/base.rb:35:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/base.rb:28:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/base.rb:35:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/base.rb:28:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-oauth2-1.9.3/lib/rack/oauth2/server/resource.rb:20:in `_call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-oauth2-1.9.3/lib/rack/oauth2/server/resource/bearer.rb:8:in `_call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-oauth2-1.9.3/lib/rack/oauth2/server/abstract/handler.rb:17:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/error.rb:39:in `block in call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/error.rb:38:in `catch'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/error.rb:38:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/base.rb:28:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape_logging-1.8.3/lib/grape_logging/middleware/request_logger.rb:60:in `block in call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape_logging-1.8.3/lib/grape_logging/middleware/request_logger.rb:58:in `catch'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape_logging-1.8.3/lib/grape_logging/middleware/request_logger.rb:58:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/middleware/base.rb:28:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/head.rb:12:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/endpoint.rb:231:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/endpoint.rb:225:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/router/route.rb:58:in `exec'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/router.rb:116:in `process_route'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/router.rb:72:in `block in identity'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/router.rb:91:in `transaction'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/router.rb:70:in `identity'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/router.rb:55:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/router.rb:132:in `with_optimization'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/router.rb:54:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/api/instance.rb:167:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/api/instance.rb:71:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.4.0/lib/grape/api/instance.rb:66:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/routing/mapper.rb:19:in `block in <class:Constraints>'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/routing/mapper.rb:48:in `serve'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/journey/router.rb:49:in `block in serve'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/journey/router.rb:32:in `each'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/journey/router.rb:32:in `serve'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/routing/route_set.rb:834:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/omniauth-1.9.0/lib/omniauth/strategy.rb:192:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/omniauth-1.9.0/lib/omniauth/strategy.rb:169:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/elasticsearch_rack_middleware.rb:24:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/redis_rack_middleware.rb:22:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/rails_queue_duration.rb:29:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/rack_middleware.rb:17:in `block in call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/transaction.rb:54:in `run'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/rack_middleware.rb:17:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/request_profiler/middleware.rb:17:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-labkit-0.12.1/lib/labkit/middleware/rack.rb:19:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-labkit-0.12.1/lib/labkit/context.rb:32:in `with_context'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-labkit-0.12.1/lib/labkit/middleware/rack.rb:18:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/go.rb:20:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/etag_caching/middleware.rb:13:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/batch-loader-1.4.0/lib/batch_loader/middleware.rb:11:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-attack-6.3.0/lib/rack/attack.rb:97:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/apollo_upload_server-2.0.0.beta.3/lib/apollo_upload_server/middleware.rb:20:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/multipart.rb:140:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-attack-6.3.0/lib/rack/attack.rb:111:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/warden-1.2.8/lib/warden/manager.rb:36:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/warden-1.2.8/lib/warden/manager.rb:34:in `catch'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/warden-1.2.8/lib/warden/manager.rb:34:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-cors-1.0.6/lib/rack/cors.rb:98:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/tempfile_reaper.rb:15:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/etag.rb:25:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/conditional_get.rb:38:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/head.rb:12:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/http/content_security_policy.rb:18:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/read_only/controller.rb:51:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/read_only.rb:18:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/session/abstract/id.rb:259:in `context'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/session/abstract/id.rb:253:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/middleware/cookies.rb:648:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/same_site_cookies.rb:27:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.1/lib/active_support/callbacks.rb:101:in `run_callbacks'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/middleware/callbacks.rb:26:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/middleware/actionable_exceptions.rb:17:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/basic_health_check.rb:25:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-6.0.3.1/lib/rails/rack/logger.rb:37:in `call_app'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-6.0.3.1/lib/rails/rack/logger.rb:26:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.1/lib/active_support/tagged_logging.rb:80:in `block in tagged'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.1/lib/active_support/tagged_logging.rb:28:in `tagged'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.1/lib/active_support/tagged_logging.rb:80:in `tagged'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-6.0.3.1/lib/rails/rack/logger.rb:26:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/handle_ip_spoof_attack_error.rb:25:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/request_context.rb:23:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/request_store-1.5.0/lib/request_store/middleware.rb:19:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/middleware/request_id.rb:27:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/method_override.rb:22:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/runtime.rb:22:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-timeout-0.5.2/lib/rack/timeout/core.rb:123:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-timeout-0.5.2/lib/rack/timeout/support/timeout.rb:19:in `timeout'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-timeout-0.5.2/lib/rack/timeout/core.rb:122:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/config/initializers/fix_local_cache_middleware.rb:9:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/middleware/executor.rb:14:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/sendfile.rb:111:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-6.0.3.1/lib/action_dispatch/middleware/host_authorization.rb:76:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/requests_rack_middleware.rb:60:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/sentry-raven-2.9.0/lib/raven/integrations/rack.rb:51:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-6.0.3.1/lib/rails/engine.rb:527:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-6.0.3.1/lib/rails/railtie.rb:190:in `public_send'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-6.0.3.1/lib/rails/railtie.rb:190:in `method_missing'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/release_env.rb:12:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/urlmap.rb:68:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/urlmap.rb:53:in `each'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.9/lib/rack/urlmap.rb:53:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-puma-4.3.3.gitlab.2/lib/puma/configuration.rb:228:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-puma-4.3.3.gitlab.2/lib/puma/server.rb:691:in `handle_request'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-puma-4.3.3.gitlab.2/lib/puma/server.rb:481:in `process_client'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-puma-4.3.3.gitlab.2/lib/puma/server.rb:335:in `block in run'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-puma-4.3.3.gitlab.2/lib/puma/thread_pool.rb:138:in `block in spawn_thread'

Results of GitLab environment info

Gitlab CE 13.2.9 Docker image.