Unable to unmount a filesystem

Solution Verified - Updated -

Issue

  • Using the umount command to unmount a filesystem does not work and shows an error:

    # umount /appl/cmsicacc/project_files
    umount: /appl/cmsicacc/project_files: device is busy
    
    # umount /opt
    umount: /opt: target is busy.
            (In some cases useful info about processes that use
             the device is found by lsof(8) or fuser(1))
    
  • Autofs does not work for mount point, and attempting to restart autofs gives the following error in /var/log/messages:

    automount[20340]: do_umount_autofs_direct: ask umount returned busy for /mnt/point
    

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 4

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