### Summary Random jobs fail with error: > ERROR: Preparation failed: Error response from daemon: Conflict. The container name "/runner-Jqo2y6XZ-project-23-concurrent-0-docker-0" is already in use by container "26b20f2f80f52b47c3ae6595a6b83e0c9c94456ca04700a04fa33761328d40c6". You have to remove (or rename) that container to be able to reuse that name. (executor_docker.go:709:0s) ### Steps to reproduce Happens randomly. ### Example Project None, since we run on premise Gitlab EE version. ### What is the current *bug* behavior? When trying to run a job, we encounter this error. ### What is the expected *correct* behavior? The job should run. ### Relevant logs and/or screenshots Full error: Running with gitlab-runner 11.8.0 (4745a6f3) on i-09e8604903824a119 Jqo2y6XZ Using Docker executor with image x/cicd-base ... Starting service docker:dind ... Pulling docker image docker:dind ... Using docker image sha256:85e924caedbd3e5245ad95cc7471168e923391b22dcb559decebe4a378a06939 for docker:dind ... ERROR: Preparation failed: Error response from daemon: Conflict. The container name "/runner-Jqo2y6XZ-project-23-concurrent-0-docker-0" is already in use by container "26b20f2f80f52b47c3ae6595a6b83e0c9c94456ca04700a04fa33761328d40c6". You have to remove (or rename) that container to be able to reuse that name. (executor_docker.go:709:0s) Will be retried in 3s ... Using Docker executor with image x/cicd-base ... Starting service docker:dind ... Pulling docker image docker:dind ... Using docker image sha256:85e924caedbd3e5245ad95cc7471168e923391b22dcb559decebe4a378a06939 for docker:dind ... ERROR: Preparation failed: Error response from daemon: Conflict. The container name "/runner-Jqo2y6XZ-project-23-concurrent-0-docker-0" is already in use by container "26b20f2f80f52b47c3ae6595a6b83e0c9c94456ca04700a04fa33761328d40c6". You have to remove (or rename) that container to be able to reuse that name. (executor_docker.go:709:0s) Will be retried in 3s ... Using Docker executor with image x/cicd-base ... Starting service docker:dind ... Pulling docker image docker:dind ... Using docker image sha256:85e924caedbd3e5245ad95cc7471168e923391b22dcb559decebe4a378a06939 for docker:dind ... ERROR: Preparation failed: Error response from daemon: Conflict. The container name "/runner-Jqo2y6XZ-project-23-concurrent-0-docker-0" is already in use by container "26b20f2f80f52b47c3ae6595a6b83e0c9c94456ca04700a04fa33761328d40c6". You have to remove (or rename) that container to be able to reuse that name. (executor_docker.go:709:0s) Will be retried in 3s ... ERROR: Job failed (system failure): Error response from daemon: Conflict. The container name "/runner-Jqo2y6XZ-project-23-concurrent-0-docker-0" is already in use by container "26b20f2f80f52b47c3ae6595a6b83e0c9c94456ca04700a04fa33761328d40c6". You have to remove (or rename) that container to be able to reuse that name. (executor_docker.go:709:0s) ### Output of checks None #### Results of GitLab environment info <details> <pre> System information System: Ubuntu 16.04 Proxy: no Current User: git Using RVM: no Ruby Version: 2.5.3p105 Gem Version: 2.7.6 Bundler Version:1.16.6 Rake Version: 12.3.2 Redis Version: 3.2.12 Git Version: 2.18.1 Sidekiq Version:5.2.5 Go Version: unknown GitLab information Version: 11.8.1-ee Revision: 39d0b2e Directory: /opt/gitlab/embedded/service/gitlab-rails DB Adapter: postgresql DB Version: 9.6.11 URL: x HTTP Clone URL: x SSH Clone URL: x Elasticsearch: yes Geo: no Using LDAP: no Using Omniauth: yes Omniauth Providers: GitLab Shell Version: 8.4.4 Repository storage paths: - default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git </pre> </details> #### Results of GitLab application Check <details> <pre> Checking GitLab subtasks ... Checking GitLab Shell ... GitLab Shell: ... GitLab Shell version >= 8.4.4 ? ... OK (8.4.4) Running /opt/gitlab/embedded/service/gitlab-shell/bin/check Check GitLab API access: OK Redis available via internal API: OK Access to /var/opt/gitlab/.ssh/authorized_keys: OK gitlab-shell self-check successful Checking GitLab Shell ... Finished Checking Gitaly ... Gitaly: ... default ... OK Checking Gitaly ... Finished Checking Sidekiq ... Sidekiq: ... Running? ... yes Number of Sidekiq processes ... 1 Checking Sidekiq ... Finished Checking Incoming Email ... Incoming Email: ... Reply by email is disabled in config/gitlab.yml Checking Incoming Email ... Finished Checking LDAP ... LDAP: ... LDAP is disabled in config/gitlab.yml Checking LDAP ... Finished Checking GitLab App ... Git configured correctly? ... yes Database config exists? ... yes All migrations up? ... yes Database contains orphaned GroupMembers? ... no GitLab config exists? ... yes GitLab config up to date? ... yes Log directory writable? ... yes Tmp directory writable? ... yes Uploads directory exists? ... yes Uploads directory has correct permissions? ... yes Uploads directory tmp has correct permissions? ... yes Init script exists? ... skipped (omnibus-gitlab has no init script) Init script up-to-date? ... skipped (omnibus-gitlab has no init script) Projects have namespace: ... 16/3 ... yes 15/5 ... yes 5/8 ... yes 59/9 ... yes 59/10 ... yes 5/12 ... yes 20/13 ... yes 61/15 ... yes 61/16 ... yes 5/17 ... yes 3/18 ... yes 4/21 ... yes 5/23 ... yes 4/24 ... yes 5/26 ... yes 75/27 ... yes 76/28 ... yes 77/29 ... yes 75/30 ... yes 75/31 ... yes 75/32 ... yes 75/33 ... yes 75/35 ... yes 5/36 ... yes 5/37 ... yes 5/38 ... yes 5/39 ... yes 5/40 ... yes 5/41 ... yes 5/42 ... yes 5/43 ... yes 5/44 ... yes 5/45 ... yes 5/46 ... yes 5/47 ... yes 5/48 ... yes 5/49 ... yes 5/50 ... yes 3/53 ... yes 5/54 ... yes 5/55 ... yes 5/56 ... yes 80/57 ... yes 5/58 ... yes 5/59 ... yes 5/60 ... yes 5/61 ... yes 5/62 ... yes 59/63 ... yes 5/65 ... yes 5/66 ... yes 5/67 ... yes 5/68 ... yes 4/69 ... yes 81/70 ... yes 5/72 ... yes 3/73 ... yes 5/74 ... yes 5/75 ... yes 5/80 ... yes 3/81 ... yes 3/82 ... yes 3/83 ... yes 3/84 ... yes 5/85 ... yes 5/86 ... yes 84/89 ... yes 84/90 ... yes 84/91 ... yes 84/92 ... yes 84/93 ... yes 84/95 ... yes 84/96 ... yes 84/97 ... yes 84/98 ... yes 58/100 ... yes 15/102 ... yes 58/103 ... yes 90/105 ... yes 90/106 ... yes 90/107 ... yes 90/109 ... yes 20/110 ... yes 90/111 ... yes 90/112 ... yes 90/113 ... yes 90/114 ... yes 90/115 ... yes 17/116 ... yes 16/117 ... yes 84/118 ... yes 59/119 ... yes 4/120 ... yes 84/121 ... yes 5/122 ... yes 5/123 ... yes 5/125 ... yes 5/126 ... yes 5/127 ... yes 104/129 ... yes 104/130 ... yes 104/131 ... yes 104/132 ... yes 85/133 ... yes 85/134 ... yes 6/136 ... yes 5/169 ... yes 150/170 ... yes 5/172 ... yes 5/173 ... yes 85/174 ... yes 15/175 ... yes 5/176 ... yes 150/177 ... yes 82/178 ... yes 17/179 ... yes 4/180 ... yes 5/181 ... yes 4/182 ... yes 5/185 ... yes 16/186 ... yes 15/188 ... yes 17/189 ... yes 5/190 ... yes 104/191 ... yes 5/192 ... yes 5/193 ... yes 15/195 ... yes 15/196 ... yes 59/197 ... yes 16/198 ... yes 105/200 ... yes 84/201 ... yes 5/202 ... yes 5/203 ... yes 5/204 ... yes 16/205 ... yes Redis version >= 2.8.0? ... yes Ruby version >= 2.3.5 ? ... yes (2.5.3) Git version >= 2.18.0 ? ... yes (2.18.1) Git user has default SSH configuration? ... yes Active users: ... 87 Elasticsearch version 5.6 - 6.x? ... yes (6.3.1) Checking GitLab App ... Finished Checking GitLab subtasks ... Finished </pre> </details> ### Possible fixes Seems to happen mostly on longer running runners.