Filesystem was unmounted cleanly, however attempting to run repair/fsck operation returns "Device or resource busy"

Issue

• A FS corruption took place, which required running further recovery actions.
• The FS was unmounted cleanly without using -l flag, i.e. without lazy unmount.

• However, attempting to run repair operations on the FS returns "Device or resource busy".

  # xfs_repair /path/to/dev/device
  xfs_repair: cannot open /path/to/dev/device: Device or resource busy