https://bugzilla.redhat.com/show_bug.cgi?id=1096280
--- Comment #3 from Lukas Doktor ldoktor@redhat.com --- Retested on RHEL-7.0-20140507.0 with the same error:
[root@cisco-b200m1-04 ~]# docker top elegant_bohr 2014/05/09 12:09:06 Error: open /sys/fs/cgroup/devices/docker-a1c00b36178aaa4bd35a1aa60a8707569dd65ffcc1c6168f9af084779846af9a.scope/tasks: no such file or directory
[root@cisco-b200m1-04 ~]# ls /sys/fs/cgroup/devices/system.slice/ cgroup.clone_children cgroup.procs devices.deny docker-a1c00b36178aaa4bd35a1aa60a8707569dd65ffcc1c6168f9af084779846af9a.scope tasks cgroup.event_control devices.allow devices.list notify_on_release
[root@cisco-b200m1-04 ~]# ls /sys/fs/cgroup/devices cgroup.clone_children cgroup.event_control cgroup.procs cgroup.sane_behavior devices.allow devices.deny devices.list notify_on_release release_agent system.slice tasks