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Why rbd map is failing when exclusive-lock, object-map, fast-diff and deep-flatten features are enabled in RBD image ?

Solution In Progress - Updated 2016-12-14T15:01:08+00:00 -

Issue

Why rbd map command is failing when exclusive-lock, object-map, fast-diff and deep-flatten features are enabled in RBD image ?
KRBD : rbd map command is failing, we should log correct error message either in system logs or in standard error output.

$rbd map rbd/test
rbd: sysfs write failed
rbd: map failed: (6) No such device or address

Environment

Red Hat Enterprise Linux 7.2
kernel-3.10.0-327.el7.x86_64

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