[rootless] kernel 5.13rc6: not using native diff for overlay

[tobwen]

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

/kind bug

Description
Podman throws an error about kernel lower than 4.8 would not using native diff for overlay, but I'm on a newer kernel.

Steps to reproduce the issue:

podman --log-level debug run -it --rm bash

Describe the results you received:

time="2021-06-21T09:57:33Z" level=debug msg="[graphdriver] trying provided driver \"overlay\""
time="2021-06-21T09:57:33Z" level=debug msg="cached value indicated that overlay is supported"
time="2021-06-21T09:57:34Z" level=debug msg="overlay test mount indicated that metacopy is not being used"
time="2021-06-21T09:57:34Z" level=info msg="Not using native diff for overlay, this may cause degraded performance for building images: opaque flag erroneously copied up, consider update to kernel 4.8 or later to fix"
time="2021-06-21T09:57:34Z" level=debug msg="backingFs=extfs, projectQuotaSupported=false, useNativeDiff=false, usingMetacopy=false"

Describe the results you expected:
Since I'm on a later kernel than 4.8, it should use native diff for overlay.

Additional information you deem important (e.g. issue happens only occasionally):
I'm running podman rootless. I'm on kernel 5.13.0-051300rc6-generic.

Output of podman version:

Version:      3.3.0-dev
API Version:  3.3.0-dev
Go Version:   go1.16.5
Git Commit:   928687e1dab6b0dd57f5673791f33a3b336830d8
Built:        Sun Jun 20 17:49:01 2021
OS/Arch:      linux/amd64

Output of podman info --debug:

host:
  arch: amd64
  buildahVersion: 1.21.1
  cgroupControllers: []
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: Unknown
    path: /usr/local/bin/conmon
    version: 'conmon version 2.0.30-dev, commit: '
  cpus: 8
  distribution:
    distribution: debian
    version: "11"
  eventLogger: journald
  hostname: debian
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1001
      size: 1
    - container_id: 1
      host_id: 165536
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1001
      size: 1
    - container_id: 1
      host_id: 165536
      size: 65536
  kernel: 5.13.0-051300rc6-generic
  linkmode: dynamic
  memFree: 7854641152
  memTotal: 8336752640
  ociRuntime:
    name: crun
    package: Unknown
    path: /usr/local/bin/crun
    version: |-
      crun version UNKNOWN
      commit: 7ef74c9330033cb884507c28fd8c267861486633
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJL
  os: linux
  remoteSocket:
    path: /run/user/1001/podman/podman.sock
  security:
    apparmorEnabled: false
    capabilities: CAP_AUDIT_WRITE,CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_MKNOD,CAP_NET_BIND_SERVICE,CAP_NET_RAW,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: true
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: false
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/local/bin/slirp4netns
    package: Unknown
    version: |-
      slirp4netns version 1.1.11+dev
      commit: 33eb5f7852e772f30ee8d5ac667fe35c796b4a94
      libslirp: 4.4.0
      SLIRP_CONFIG_VERSION_MAX: 3
      libseccomp: 2.5.1
  swapFree: 1022357504
  swapTotal: 1022357504
  uptime: 27m 10.14s
registries:
  search:
  - docker.io
store:
  configFile: /home/podman/.config/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /home/podman/.local/share/containers/storage
  graphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "false"
  imageStore:
    number: 1
  runRoot: /run/user/1001/containers
  volumePath: /home/podman/.local/share/containers/storage/volumes
version:
  APIVersion: 3.3.0-dev
  Built: 1624211341
  BuiltTime: Sun Jun 20 17:49:01 2021
  GitCommit: 928687e1dab6b0dd57f5673791f33a3b336830d8
  GoVersion: go1.16.5
  OsArch: linux/amd64
  Version: 3.3.0-dev

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide? (https://github.com/containers/podman/blob/master/troubleshooting.md)
Yes

Additional environment details (AWS, VirtualBox, physical, etc.):
Frankendebian: Debian Bullseye RC1 with Ubuntu Mainline kernel 5.13.0-051300rc6-generic on VirtualBox (AMD64)

[giuseppe]

have you tried the command with a fresh storage (podman system reset)?

[tobwen]

Yes:

podman@debian:/tmp$ podman system reset

WARNING! This will remove:
        - all containers
        - all pods
        - all images
        - all build cache
Are you sure you want to continue? [y/N] y

podman@debian:/tmp$ podman --log-level debug run -it --rm bash
[...]

DEBU[0000] [graphdriver] trying provided driver "overlay"
DEBU[0000] cached value indicated that overlay is supported
DEBU[0000] overlay test mount indicated that metacopy is not being used
INFO[0000] Not using native diff for overlay, this may cause degraded performance for building images: opaque flag erroneously copied up, consider update to kernel 4.8 or later to fix
DEBU[0000] backingFs=extfs, projectQuotaSupported=false, useNativeDiff=false, usingMetacopy=false
[...]

It does NOT appear when being root.