  We include a new 7-form ansatz in 11-dimensional supergravity over AdS_4 x
S^7/Z_k when the internal space is considered as a U(1) bundle on CP^3. After a
general analysis of the ansatz, we take a special form of it and obtain a
scalar equation from which we focus on a few massive bulk modes that are SU(4)
x U(1) R-singlet and break all supersymmetries. The mass term breaks the scale
invariance and so the (perturbative) solutions we obtain are SO(4) invariant in
Euclidean AdS_4 (or SO(3,1) in its dS_3 slicing). The corresponding bare
operators are irrelevant in probe approximation; and to realize the AdS_4/CFT_3
correspondence, we need to swap the fundamental representations of $SO(8)$ for
supercharges with those for scalars and fermions. In fact, we have domain-walls
arising from (anti)M5-branes wrapping around S^3/Z_k of the internal space with
parity breaking scheme. As a result, the duals may be in three-dimensional U(N)
or O(N) Chern-Simon models with matters in fundamental representations.
Accordingly, we present dual boundary operators and build instanton solutions
in a truncated version of the boundary ABJM action; and, because of the
unboundedness of bulk potential from below, it is thought that they lead to big
crunch singularities in the bulk.
