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docker-autotest reporting this failure on docker-1.10.3-55.el7.x86_64 et al:

    # docker run --rm --cgroup-parent=foo-bar.slice centos cat /proc/1/cgroup
    11:perf_event:/foo.slice/foo-bar.slice/docker-<sha>.scope
    ...
    5:cpuacct,cpu:/foo.slice/foo-bar.slice/docker-<sha>.scope
 >> 4:pids:/
    3:cpuset:/foo.slice/foo-bar.slice/docker-<sha>.scope
    ...

What OS are you testing on? I do not see the pids cgroup enabled on my RHEL 7.2 VM.

RHEL 7.3, kernel 3.10.0-513.el7.x86_64

Thanks! I checked the code. We don't have the pids cgroups support for libcontainer in our docker 1.10.x branches. So, if we really want it in docker 1.10 then we need a backport which should be straight forward. 

Dan, wdyt about backporting to 1.10 or should we just support it in 1.12+?

I think we should just support this in docker-1.12 unless we are forced by OpenShift.  For now lets close this as fixed in docker-1.12.

In docker-1.12.3-4.el7.x86_64

# docker run --rm --cgroup-parent=foo-bar.slice rhel7 cat /proc/1/cgroup
.....
10:pids:/foo.slice/foo-bar.slice/docker-9788efa1b06cfa3dd86ad523c79dde6143740908b030d434fbeda03939b7365d.scope

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2017-0116.html