RHEL6: Umount returns "device is busy" due to "sfs" module

Solution Unverified - Updated -

Issue

Umount of filesystem returns EBUSY and neither fuser nor lsof return any output :

# umount /mytest
umount: /mytest: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
# lsof +D /mytest
#

Environment

  • RHEL6

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