Unable to unmount ext4 filesystem due to "device is busy" error.
Issue
- While shutting down the system, hitting the message:
umount: /common: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
Environment
- Red Hat Enterprise Linux 6
- ext4
- Third party 'dbcfs' filesystem
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