for version db4o v6.1.602
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A simple sode query as follows throws stackoverflow exception.

 IQuery query = db.Query();
 IConstraint a = query.Constrain(typeof(A));
 IConstraint b = query.Descend("Arry").Descend("B_Name").Constrain("BName");
 IConstraint c = query.Descend("Arry").Descend("C_Name").Constrain("CName");
a.And(b);
a.And(c);

If the order of ANDing is changed and writen as,
  a.And(c);
  a.And(b);

the query is executed sucessfully.

If more complex query is writen for example
   IQuery query = db.Query();
            IConstraint a = query.Constrain(typeof(A));
            IConstraint b = query.Descend("Arry").Descend("B_Name").Constrain("BName");
            IConstraint c = query.Descend("Arry").Descend("C_Name").Constrain("CName");
            IConstraint x1 = a.And(c);
            IConstraint x2 = a.And(b);
            IConstraint x3 = x1.And(x2);

            IConstraint a1 = query.Constrain(typeof(A));
            IConstraint b1 = query.Descend("Arry1").Descend("B_Name").Constrain("BNamex");
            IConstraint c1 = query.Descend("Arry1").Descend("C_Name").Constrain("CNamey");
            IConstraint x11 = a1.And(c1);
            IConstraint x21 = a1.And(b1);
            IConstraint x31 = x11.And(x21);
            x31.And(x3);

            IObjectSet result = query.Execute();

It always throws stack overflow exception. A testcase to show both these scenario is attached alongwith.