diff --git a/daemon/albatrossd.ml b/daemon/albatrossd.ml
index 6a97dfd..00d2f6a 100644
--- a/daemon/albatrossd.ml
+++ b/daemon/albatrossd.ml
@@ -27,7 +27,7 @@ let rec create stat_out log_out cons_out data_out hdr name config =
    | Error `Msg msg ->
      Logs.err (fun m -> m "failed to create %a: %s" Name.pp name msg) ;
      Lwt.return (None, (hdr, `Failure msg))
-   | Ok (state', `Create (cons, succ_cont, fail_cont)) ->
+   | Ok (state', (cons, succ_cont, fail_cont)) ->
      state := state';
      cons_out "create" cons >>= function
      | Error () -> Lwt.return (None, fail_cont ())
diff --git a/src/vmm_vmmd.ml b/src/vmm_vmmd.ml
index 1c2ae28..eae669f 100644
--- a/src/vmm_vmmd.ml
+++ b/src/vmm_vmmd.ml
@@ -179,12 +179,13 @@ let handle_create t hdr name vm_config =
       (hdr, `Failure m)
   in
   Ok ({ t with console_counter = Int64.succ t.console_counter },
-      `Create (cons_out, success, fail))
+      (cons_out, success, fail))
 
 let handle_shutdown t name vm r =
   (match Vmm_unix.free_system_resources name vm.Unikernel.taps with
    | Ok () -> ()
-   | Error (`Msg e) -> Logs.warn (fun m -> m "%s while shutdown vm %a" e Unikernel.pp vm)) ;
+   | Error (`Msg e) ->
+     Logs.err (fun m -> m "%s while shutdown vm %a" e Unikernel.pp vm));
   let t, log_out = log t name (`Unikernel_stop (name, vm.Unikernel.pid, r)) in
   let t, stat_out = remove_stats t name in
   (t, stat_out, log_out)
diff --git a/src/vmm_vmmd.mli b/src/vmm_vmmd.mli
index f63b5d3..64f21fc 100644
--- a/src/vmm_vmmd.mli
+++ b/src/vmm_vmmd.mli
@@ -8,13 +8,14 @@ val init : Vmm_commands.version -> 'a t
 
 val waiter : 'a t -> Name.t -> 'a t * 'a option
 
-val register : 'a t -> Name.t -> (unit -> 'b * 'a) -> ('a t * 'b)
+val register : 'a t -> Name.t -> (unit -> 'b * 'a) -> 'a t * 'b
 
 val register_restart : 'a t -> Name.t -> (unit -> 'b * 'a) -> ('a t * 'b) option
 
 type 'a create =
   Vmm_commands.wire *
-  ('a t -> ('a t * Vmm_commands.wire * Vmm_commands.wire * Vmm_commands.wire * Name.t * Unikernel.t, [ `Msg of string ]) result) *
+  ('a t -> ('a t * Vmm_commands.wire * Vmm_commands.wire * Vmm_commands.wire *
+            Name.t * Unikernel.t, [ `Msg of string ]) result) *
   (unit -> Vmm_commands.wire)
 
 val handle_shutdown : 'a t -> Name.t -> Unikernel.t ->
@@ -22,7 +23,7 @@ val handle_shutdown : 'a t -> Name.t -> Unikernel.t ->
 
 val handle_create : 'a t -> Vmm_commands.header ->
   Name.t -> Unikernel.config ->
-  ('a t * [ `Create of 'a create ], [> `Msg of string ]) result
+  ('a t * 'a create, [> `Msg of string ]) result
 
 val handle_command : 'a t -> Vmm_commands.wire ->
   ('a t *