anchor.diff:                  end,
               ?assertMatch({_, {ok, _}}, MkAnsCheck),
               {Level3TmpDir, _} = MkAnsCheck,
  +            ct:print("Verify spawn2 ~p", [{Level3TmpDir}]),
               VerifyStats(Level3TmpDir, true)
           end, Workers)
       end, Level2TmpDirs),
  
positive.code: 
      lists:foreach(fun(W) ->
          Level2TmpDir = <<Dir/binary, "/", (generator:gen_name())/binary>>,
          ?assertMatch({ok, _}, lfm_proxy:mkdir(W, SessId(W), Level2TmpDir, 8#755)),
          VerifyStats(Level2TmpDir, true),
  
          lists:foreach(fun(W2) ->
              Level3TmpDir = <<Level2TmpDir/binary, "/", (generator:gen_name())/binary>>,
              ?assertMatch({ok, _}, lfm_proxy:mkdir(W2, SessId(W2), Level3TmpDir, 8#755)),
              VerifyStats(Level3TmpDir, true)
          end, Workers)
  
negative.code:             end,
          ?assertMatch({_, {ok, _}}, MkAnsCheck),
          {Level2TmpDir, _} = MkAnsCheck,
          ct:print("Verify spawn1 ~p", [{Level2TmpDir}]),
          VerifyStats(Level2TmpDir, true),
          [Level2TmpDir | Acc]
      end, [], Workers),
  