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we have rhel 7.2 server with docker service and docker container

docker ps
CONTAINER ID        IMAGE                   COMMAND                  CREATED             STATUS              PORTS               NAMES
9fcdfcd76932        linux-exporter:v1.2.0   "/bin/linux_exporter…"   3 days ago          Up 3 days                               linux-exporter

from the dmesg we get many lines with Unmounting Filesystem / Mounting V4 Filesystem

as the following

[Wed Dec 23 05:52:11 2020] XFS (dm-4): Ending clean mount
[Wed Dec 23 05:52:12 2020] XFS (dm-4): Unmounting Filesystem
[Wed Dec 23 05:53:12 2020] XFS (dm-4): Mounting V4 Filesystem
[Wed Dec 23 05:53:12 2020] XFS (dm-4): Ending clean mount
[Wed Dec 23 05:53:13 2020] XFS (dm-4): Unmounting Filesystem
[Wed Dec 23 05:54:13 2020] XFS (dm-4): Mounting V4 Filesystem
[Wed Dec 23 05:54:13 2020] XFS (dm-4): Ending clean mount
[Wed Dec 23 05:54:14 2020] XFS (dm-4): Unmounting Filesystem
[Wed Dec 23 05:55:14 2020] XFS (dm-4): Mounting V4 Filesystem
[Wed Dec 23 05:55:14 2020] XFS (dm-4): Ending clean mount
[Wed Dec 23 05:55:15 2020] XFS (dm-4): Unmounting Filesystem
[Wed Dec 23 05:56:15 2020] XFS (dm-4): Mounting V4 Filesystem
[Wed Dec 23 05:56:15 2020] XFS (dm-4): Ending clean mount
[Wed Dec 23 05:56:16 2020] XFS (dm-4): Unmounting Filesystem
[Wed Dec 23 05:57:16 2020] XFS (dm-4): Mounting V4 Filesystem
[Wed Dec 23 05:57:16 2020] XFS (dm-4): Ending clean mount
[Wed Dec 23 05:57:17 2020] XFS (dm-4): Unmounting Filesystem
[Wed Dec 23 05:58:17 2020] XFS (dm-4): Mounting V4 Filesystem
[Wed Dec 23 05:58:17 2020] XFS (dm-4): Ending clean mount
[Thu Dec 24 05:13:42 2020] XFS (dm-4): Unmounting Filesystem
[Thu Dec 24 05:13:42 2020] device-mapper: thin: Deletion of thin device 44 failed.
[Thu Dec 24 05:13:43 2020] device-mapper: ioctl: remove_all left 4 open device(s)
[Thu Dec 24 05:13:45 2020] XFS (dm-4): Mounting V4 Filesystem
[Thu Dec 24 05:13:45 2020] XFS (dm-4): Ending clean mount
[Thu Dec 24 05:13:45 2020] XFS (dm-4): Unmounting Filesystem
[Thu Dec 24 05:13:46 2020] XFS (dm-4): Mounting V4 Filesystem
[Thu Dec 24 05:13:46 2020] XFS (dm-4): Ending clean mount
[Thu Dec 24 05:13:46 2020] XFS (dm-4): Unmounting Filesystem
[Thu Dec 24 05:13:46 2020] XFS (dm-4): Mounting V4 Filesystem
[Thu Dec 24 05:13:46 2020] XFS (dm-4): Ending clean mount

we checked the info from xfs_info

xfs_info /var/lib/docker
meta-data=/dev/mapper/vg-linux_var isize=256    agcount=26, agsize=1039872 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=26441728, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

what we can see is that ftype=0 when we have rhel 7.2

but not sure if this related to our problem

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