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Why does unmounting the filesystem returns error "device is busy" when lsof does not show any files held open in the memory?

Solution Verified - Updated 2015-11-30T17:36:47+00:00 -

Issue

After stopping oracle 12.1.0 on any node in the rac cluster, /oracle can only be unmounted by issuing umount -l /oracle although lsof and fuser do not show any processes accessing /oracle.
Once umount -l /oracle has been issued one single time, further starts & stops of oracle result in expected behaviour, e.g. umount /oracle is successful.
nfs related services are not running.

Environment

Red Hat Enterprise Linux 6

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