How to unmount a stale NFS mount that fails to unmount with 'device is busy' after network disconnectivity?

Solution Verified - Updated -

Issue

  • Temporarily losing network connection to the NFS Server some times causes the NFS client mount to go stale.
  • Standard attempts to umount fails with the "EBUSY" message: umount: /mnt/nfs: device is busy when using any of the following commands:
 # mount -t nfs -o remount /mnt/nfs
 # umount /mnt/nfs
 # umount -f /mnt/nfs
 # umount -l /mnt/nfs
 # umount -lf /mnt/nfs

Environment

  • Red Hat Enterprise Linux

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