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
  • 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 4, 5, 6 or 7

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