umount command fails during system shutdown.

Solution Verified - Updated -

Issue

  • umount command fails during system shutdown.
Unmounting pipe file systems:                               [  OK  ]
  Unmounting file systems:  umount : /backup: device is busy
  umount: /backup: device is busy
                                                              [FAILED]
  Unmounting file systems (retry):  umount2: Device or resource busy
  umount: /backup: device is busy
  umount2: Device or resource busy
  umount: /backup: device is busy
                                                              [FAILED]
  Unmounting file systems (retry):  umount2: Device or resource busy
  umount: /backup: device is busy
  umount2: Device or resource busy
  umount: /backup: device is busy
                                                              [FAILED]
  umount2: Device or resource busy
  umount: /backup: device is busy
  umount2: Device or resource busy
  umount: /backup: device is busy
  Please stand by while rebooting the system...
  • This problem does not occur in Red Hat Enterprise Linux 5.7.

Environment

  • Red Hat Enterprise Linux 5.8, 5.9
  • nfs-utils versions prior to 1.0.9-68.el5

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