[Bug 1455358] [NEW] cgroup: new mount options do not match the existing superblock, will be ignored

[jdfalk]

Public bug reported:

This is actually a upstream kernel warning message and should be filed
against linux kernel but since I am running a mainline kernel I didn't
want to file directly against the kernel.

May 14 22:21:31 kernel: cgroup: new mount options do not match the
existing superblock, will be ignored

Looks like systemd is using xattr and /sys/fs/cgroup is not if I am
reading this right http://www.spinics.net/lists/cgroups/msg07467.html

/var/log# mount  | grep cgroup
tmpfs on /sys/fs/cgroup type tmpfs (rw,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset,clone_children)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/cgm-release-agent.hugetlb)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agents/cgm-release-agent.perf_event)

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: cgroup-bin (not installed)
Uname: Linux 4.1.0-040100rc3-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
Date: Fri May 15 00:01:42 2015
InstallationDate: Installed on 2015-05-10 (5 days ago)
InstallationMedia: Ubuntu-Server 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: libcgroup
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: libcgroup (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

** Attachment added: "uname-a.log"
   https://bugs.launchpad.net/bugs/1455358/+attachment/4397922/+files/uname-a.log

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Title:
  cgroup: new mount options do not match the existing superblock, will
  be ignored

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