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UndefinedConversionError GitLab Wiki -> Mattermost

  • GitLab Omnibus 11.2.3

  • Editing a wiki page

  • Mattermost notification enabled

  • The text of the wiki page contains a German umlaut

Started PUT "/ComNets/Organization/wikis/Protocols/Institute-meeting" for 134.28.162.198 at 2018-08-29 13:05:08 +0000
Processing by Projects::WikisController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"[FILTERED]", "wiki"=>{"last_commit_sha"=>"4431d9c7db3118d7933c2f196072db8853229ab6", "title"=>"Institute meeting", "format"=>"markdown", "content"=>"[FILTERED]", "message"=>"Update Institute meeting"}, "namespace_id"=>"ComNets", "project_id"=>"Organization", "id"=>"Protocols/Institute-meeting"}
Started POST "/api/v4/internal/allowed" for 127.0.0.1 at 2018-08-29 13:05:08 +0000
Started POST "/api/v4/internal/pre_receive" for 127.0.0.1 at 2018-08-29 13:05:08 +0000
Started POST "/api/v4/internal/post_receive" for 127.0.0.1 at 2018-08-29 13:05:08 +0000
Completed 500 Internal Server Error in 446ms (ActiveRecord: 7.3ms)

Encoding::UndefinedConversionError ("\xC3" from ASCII-8BIT to UTF-8):
  config/initializers/forbid_sidekiq_in_transactions.rb:35:in `block (2 levels) in <module:NoEnqueueingFromTransactions>'
  app/models/service.rb:239:in `async_execute'
  app/models/project.rb:1156:in `block (2 levels) in execute_services'
  app/models/project.rb:1155:in `block in execute_services'
  lib/after_commit_queue.rb:27:in `instance_eval'
  lib/after_commit_queue.rb:27:in `run_after_commit_or_now'
  app/models/project.rb:1154:in `execute_services'
  app/services/wiki_pages/base_service.rb:10:in `execute_hooks'
  app/services/wiki_pages/update_service.rb:7:in `execute'
  app/controllers/projects/wikis_controller.rb:52:in `update'
  lib/gitlab/i18n.rb:51:in `with_locale'
  lib/gitlab/i18n.rb:57:in `with_user_locale'
  app/controllers/application_controller.rb:401:in `set_locale'
  lib/gitlab/middleware/multipart.rb:97:in `call'
  lib/gitlab/request_profiler/middleware.rb:14:in `call'
  lib/gitlab/middleware/go.rb:17:in `call'
  lib/gitlab/etag_caching/middleware.rb:11:in `call'
  lib/gitlab/middleware/read_only/controller.rb:38:in `call'
  lib/gitlab/middleware/read_only.rb:16:in `call'
  lib/gitlab/middleware/basic_health_check.rb:25:in `call'
  lib/gitlab/request_context.rb:18:in `call'
  lib/gitlab/metrics/requests_rack_middleware.rb:27:in `call'
  lib/gitlab/middleware/release_env.rb:10:in `call'