Describe the bug

Failed to create cephfs PVC

Environment details

• Image/version of Ceph CSI driver: canary
• helm chart version
• Kubernetes cluster version: 1.15.0
• Logs

E0722 08:26:57.932549       1 volume.go:100] failed to create subvolume group csi, for the vol csi-vol-77ecd37e-ac5a-11e9-8a38-22008e3300de(an error occurred while running (597) ceph [fs subvolumegroup create myfs csi --mode 777 --pool_layout myfs-data0 -m 10.106.133.206:6789 -c /etc/ceph/ceph.conf -n client.admin --key=***stripped***]: exit status 22: 2019-07-22 08:26:57.543 7f97e93ba700 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,: (2) No such file or directory
2019-07-22 08:26:57.543 7f97e93ba700 -1 AuthRegistry(0x7f97e4063b98) no keyring found at /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,, disabling cephx
2019-07-22 08:26:57.580 7f97e93ba700 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,: (2) No such file or directory
2019-07-22 08:26:57.580 7f97e93ba700 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,: (2) No such file or directory
2019-07-22 08:26:57.580 7f97e93ba700 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,: (2) No such file or directory
2019-07-22 08:26:57.614 7f97e93ba700 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,: (2) No such file or directory
2019-07-22 08:26:57.614 7f97e93ba700 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,: (2) No such file or directory
2019-07-22 08:26:57.614 7f97e93ba700 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,: (2) No such file or directory
2019-07-22 08:26:57.614 7f97e93ba700 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,: (2) No such file or directory
Error EINVAL: Traceback (most recent call last):
  File "/usr/share/ceph/mgr/mgr_module.py", line 909, in _handle_command
    return self.handle_command(inbuf, cmd)
  File "/usr/share/ceph/mgr/volumes/module.py", line 182, in handle_command
    return handler(inbuf, cmd)
  File "/usr/share/ceph/mgr/volumes/module.py", line 208, in _cmd_fs_subvolumegroup_create
    return self.vc.create_subvolume_group(vol_name, group_name, mode=mode, pool=pool_layout)
  File "/usr/share/ceph/mgr/volumes/fs/volume.py", line 305, in create_subvolume_group
    sv.create_group(spec, pool=pool, mode=self.octal_str_to_decimal_int(mode))
  File "/usr/share/ceph/mgr/volumes/fs/subvolume.py", line 178, in create_group
    self._mkdir_p(path, mode)
  File "/usr/share/ceph/mgr/volumes/fs/subvolume.py", line 58, in _mkdir_p
    self.fs.mkdir(subpath, mode)
  File "cephfs.pyx", line 801, in cephfs.LibCephFS.mkdir (/home/jenkins-build/build/workspace/ceph-dev-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos7/DIST/centos7/MACHINE_SIZE/huge/release/14.2.1-636-g64f035c/rpm/el7/BUILD/ceph-14.2.1-636-g64f035c/build/src/pybind/cephfs/pyrex/cephfs.c:8613)
Error: (13, "error in mkdir 'volumes': error code 13")

Steps to reproduce

deploy cephfs plugin and create PVC