Hi all, We have been experiencing some devicemapper issues with Docker since the last few weeks on CentOS CI and CentOS in general. This issue is reported here: https://github.com/moby/moby/issues/23089, however the workaround does not work. Did anyone face similar issue? Does anyone know how to workaround it. Debug info ======== [root at nxx ~]# docker --version Docker version 1.12.6, build 1398f24/1.12.6 [root at nxx ~]# systemctl status docker -l ● docker.service - Docker Application Container Engine Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since Mon 2017-06-12 08:14:41 BST; 1min 22s ago Docs: http://docs.docker.com Process: 300 ExecStart=/usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc --exec-opt native.cgroupdriver=systemd --userland-proxy-path=/usr/libexec/docker/docker-proxy-current $OPTIONS $DOCKER_STORAGE_OPTIONS $DOCKER_NETWORK_OPTIONS $ADD_REGISTRY $BLOCK_REGISTRY $INSECURE_REGISTRY (code=exited, status=1/FAILURE) Main PID: 300 (code=exited, status=1/FAILURE) Jun 12 08:14:40 n41.pufty.ci.centos.org systemd[1]: Starting Docker Application Container Engine... Jun 12 08:14:40 n41.pufty.ci.centos.org dockerd-current[300]: time="2017-06-12T08:14:40.732651146+01:00" level=warning msg="[!] DON'T BIND ON ANY IP ADDRESS WITHOUT setting -tlsverify IF YOU DON'T KNOW WHAT YOU'RE DOING [!]" Jun 12 08:14:40 n41.pufty.ci.centos.org dockerd-current[300]: time="2017-06-12T08:14:40.742206601+01:00" level=info msg="libcontainerd: new containerd process, pid: 308" Jun 12 08:14:41 n41.pufty.ci.centos.org dockerd-current[300]: time="2017-06-12T08:14:41.758615859+01:00" level=warning msg="devmapper: Usage of loopback devices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man docker` to refer to dm.thinpooldev section." Jun 12 08:14:41 n41.pufty.ci.centos.org dockerd-current[300]: time="2017-06-12T08:14:41.759174439+01:00" level=error msg="[graphdriver] prior storage driver \"devicemapper\" failed: devmapper: Base Device UUID and Filesystem verification failed: devicemapper: Can't set cookie dm_task_set_cookie failed" Jun 12 08:14:41 n41.pufty.ci.centos.org dockerd-current[300]: time="2017-06-12T08:14:41.759576207+01:00" level=fatal msg="Error starting daemon: error initializing graphdriver: devmapper: Base Device UUID and Filesystem verification failed: devicemapper: Can't set cookie dm_task_set_cookie failed" Jun 12 08:14:41 n41.pufty.ci.centos.org systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE Jun 12 08:14:41 n41.pufty.ci.centos.org systemd[1]: Failed to start Docker Application Container Engine. Jun 12 08:14:41 n41.pufty.ci.centos.org systemd[1]: Unit docker.service entered failed state. Jun 12 08:14:41 n41.pufty.ci.centos.org systemd[1]: docker.service failed. Thanks, rtnpro -- Ratnadeep Debnath, https://www.waartaa.com GPG Fingerprint: 033C 8041 A0E9 CDBA 2E02 B785 2119 5486 F245 DFD6