If I start glusterfs with a volume file like:

volume posix1
    type storage/posix
#   option o-direct enable # (default: disable) boolean type only
#   option export-statfs-size no # (default: yes) boolean type only
#   option mandate-attribute off # (default: on) boolean type only
#   option span-devices 8 # (default: 0) integer value
#   option background-unlink yes # (default: no) boolean type
    option directory /exports/nfs
end-volume

volume posix-ac1
    type features/access-control
    subvolumes posix1
end-volume

volume locks1
    type features/locks
#   option mandatory on # Default off, used in specific applications
    subvolumes posix1
end-volume

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Error should be logged saying posix-ac1 is dangling, and if access-control is mandatory then GlusterFS should not start.

Instead GlusterFS starts with no errors. i.e starts without access-control.