podman: rootless podman containers Error: unable to obtain cgroup stats:

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

/kind feature

Description podman stats not working : Error: unable to obtain cgroup stats: open /sys/fs/cgroup/libpod_parent/libpod-06e04ef2d62db292f5981bcb9edbfab7947c22f6c0da8234a9e076d130af858d/pids.current: open /sys/fs/cgroup/libpod_parent/libpod-06e04ef2d62db292f5981bcb9edbfab7947c22f6c0da8234a9e076d130af858d/pids.current: no such file or directory

Steps to reproduce the issue:

1.Run Podman under rootless user with cgroupv2

1. install crun

3.Change OCI runtime to crun

Describe the results you received:

Describe the results you expected:

Additional information you deem important (e.g. issue happens only occasionally):

Output of podman version:

podman version
Version:      2.0.6
API Version:  1
Go Version:   go1.13.14
Built:        Tue Sep  1 15:27:34 2020
OS/Arch:      linux/amd64

Output of podman info --debug:

host:
  arch: amd64
  buildahVersion: 1.15.1
  cgroupVersion: v2
  conmon:
    package: conmon-2.0.20-3.el7.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.0.20, commit: 148f083d9a283b8784940e52b749bf8af63f0efe-dirty'
  cpus: 8
  distribution:
    distribution: '"centos"'
    version: "8"
  eventLogger: file
  hostname: dev174
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1005
      size: 1
    - container_id: 1
      host_id: 427680
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1005
      size: 1
    - container_id: 1
      host_id: 427680
      size: 65536
  kernel: 4.18.0-193.14.2.el8_2.x86_64
  linkmode: dynamic
  memFree: 5886853120
  memTotal: 8187670528
  ociRuntime:
    name: crun
    package: Unknown
    path: /usr/local/bin/crun
    version: |-
      crun version 0.10.3.96-a8c5
      commit: a8c50bedd3a70d614b27135a19688a4aa9351f70
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJL
  os: linux
  remoteSocket:
    path: /tmp/run-1005/podman/podman.sock
  rootless: true
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-0.4.2-3.git21fdece.module_el8.1.0+298+41f9343a.x86_64
    version: |-
      slirp4netns version 0.4.2+dev
      commit: 21fdece2737dc24ffa3f01a341b8a6854f8b13b4
  swapFree: 8497655808
  swapTotal: 8497655808
  uptime: 1h 9m 30.66s (Approximately 0.04 days)
registries:
  search:
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - registry.centos.org
  - docker.io
store:
  configFile: /home/user/.config/containers/storage.conf
  containerStore:
    number: 4
    paused: 0
    running: 1
    stopped: 3
  graphDriverName: overlay
  graphOptions:
    overlay.mount_program:
      Executable: /bin/fuse-overlayfs
      Package: fuse-overlayfs-0.7.2-5.module_el8.1.0+298+41f9343a.x86_64
      Version: |-
        fuse-overlayfs: version 0.7.2
        FUSE library version 3.2.1
        using FUSE kernel interface version 7.26
  graphRoot: /home/user/.local/share/containers/storage
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "false"
  imageStore:
    number: 5
  runRoot: /tmp/run-1005
  volumePath: /home/user/.local/share/containers/storage/volumes
version:
  APIVersion: 1
  Built: 1598988454
  BuiltTime: Tue Sep  1 15:27:34 2020
  GitCommit: ""
  GoVersion: go1.13.14
  OsArch: linux/amd64
  Version: 2.0.6

Package info (e.g. output of rpm -q podman or apt list podman):

rpm -q podman
podman-2.0.6-1.el7.x86_64

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide?

Yes

Additional environment details (AWS, VirtualBox, physical, etc.):