diff --git a/rebar.config b/rebar.config
index ee58d3dac..a60982c65 100644
--- a/rebar.config
+++ b/rebar.config
@@ -7,7 +7,7 @@
   {jiffy, {git, "https://github.com/emqx/jiffy", {tag, "1.0.5"}}},
   {cowboy, {git, "https://github.com/emqx/cowboy", {tag, "2.7.1"}}},
   {esockd, {git, "https://github.com/emqx/esockd", {tag, "5.7.6"}}},
-  {ekka, {git, "https://github.com/emqx/ekka", {tag, "0.7.10"}}},
+  {ekka, {git, "https://github.com/emqx/ekka", {tag, "0.7.11"}}},
   {gen_rpc, {git, "https://github.com/emqx/gen_rpc", {tag, "2.5.0"}}},
   {cuttlefish, {git, "https://github.com/emqx/cuttlefish", {tag, "v3.0.0"}}}
  ]}.
diff --git a/src/emqx.appup.src b/src/emqx.appup.src
index dbaeae143..b6148a095 100644
--- a/src/emqx.appup.src
+++ b/src/emqx.appup.src
@@ -3,9 +3,10 @@
 {VSN,
  [
    {"4.2.0", [
-     {load_module, emqx_message, brutal_purge, soft_purge, []},
-     {add_module, emqx_congestion},
      {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []},
+     {load_module, emqx_message, brutal_purge, soft_purge, []},
+     {add_module, emqx_congestion},     
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
      {load_module, emqx_session, brutal_purge, soft_purge, []},
      {load_module, emqx_metrics, brutal_purge, soft_purge, []},
@@ -30,12 +31,14 @@
      {load_module, emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module, emqx_app, brutal_purge, soft_purge, []},
      {load_module, emqx_misc,brutal_purge,soft_purge,[]},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {"4.2.1", [
-     {load_module, emqx_message, brutal_purge, soft_purge, []},
-     {add_module, emqx_congestion},
      {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []},
+     {load_module, emqx_message, brutal_purge, soft_purge, []},
+     {add_module, emqx_congestion},     
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
      {load_module, emqx_session, brutal_purge, soft_purge, []},
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
@@ -59,13 +62,15 @@
      {load_module, emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module, emqx_app, brutal_purge, soft_purge, []},
      {load_module, emqx_misc,brutal_purge,soft_purge,[]},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.[23]">>, [
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []},
      {load_module, emqx_message, brutal_purge, soft_purge, []},
      {add_module, emqx_congestion},
-     {load_module, emqx_frame, brutal_purge, soft_purge, []},
-     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_frame, brutal_purge, soft_purge, []},     
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
      {load_module, emqx_session, brutal_purge, soft_purge, []},
      {update, emqx_connection, {advanced, []}},
@@ -86,9 +91,12 @@
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.4">>, [
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []},
      {load_module, emqx_message, brutal_purge, soft_purge, []},
      {load_module, emqx_frame, brutal_purge, soft_purge, []},
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
@@ -96,8 +104,7 @@
      {load_module, emqx_congestion, brutal_purge, soft_purge, []},
      {update, emqx_connection, {advanced, []}},
      {load_module, emqx_ws_connection, brutal_purge, soft_purge, []},
-     {load_module, emqx_os_mon, brutal_purge, soft_purge, []},
-     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_os_mon, brutal_purge, soft_purge, []},     
      {load_module, emqx_router_sup, soft_purge, soft_purge, []},
      {load_module, emqx_broker, soft_purge, soft_purge, []},
      {load_module, emqx_trie, soft_purge, soft_purge, []},
@@ -112,9 +119,12 @@
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.5">>, [
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []},
      {load_module, emqx_message, brutal_purge, soft_purge, []},
      {load_module, emqx_frame, brutal_purge, soft_purge, []},
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
@@ -122,8 +132,7 @@
      {load_module, emqx_congestion, brutal_purge, soft_purge, []},
      {update, emqx_connection, {advanced, []}},
      {load_module, emqx_ws_connection, brutal_purge, soft_purge, []},
-     {load_module, emqx_os_mon, brutal_purge, soft_purge, []},
-     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_os_mon, brutal_purge, soft_purge, []},    
      {load_module, emqx_router_sup, soft_purge, soft_purge, []},
      {load_module, emqx_broker, soft_purge, soft_purge, []},
      {load_module, emqx_trie, soft_purge, soft_purge, []},
@@ -137,9 +146,12 @@
      {load_module, emqx_app, brutal_purge, soft_purge, []},
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.[6-7]">>, [
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []},
      {load_module, emqx_message, brutal_purge, soft_purge, []},
      {load_module, emqx_frame, brutal_purge, soft_purge, []},
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
@@ -151,15 +163,18 @@
      {load_module, emqx_mqueue,brutal_purge,soft_purge,[]},
      {load_module, emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module, emqx_misc,brutal_purge,soft_purge,[]},
-     {load_module, emqx_app, brutal_purge, soft_purge, []},
-     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_app, brutal_purge, soft_purge, []},     
      {load_module, emqx_os_mon, brutal_purge, soft_purge, []},
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.8">>, [
+     {load_module, emqx_access_rule, brutal_purge, soft_purge, []},
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []},
      {load_module, emqx_message, brutal_purge, soft_purge, []},
      {load_module, emqx_frame, brutal_purge, soft_purge, []},
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
@@ -169,12 +184,15 @@
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
-     {load_module, emqx_app, brutal_purge, soft_purge, []},
-     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_app, brutal_purge, soft_purge, []},     
      {load_module, emqx_os_mon, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.9">>, [
+     {load_module, emqx_access_rule, brutal_purge, soft_purge, []},
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []},
      {load_module, emqx_message, brutal_purge, soft_purge, []},
      {load_module, emqx_frame, brutal_purge, soft_purge, []},
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
@@ -183,23 +201,38 @@
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
-     {load_module, emqx_app, brutal_purge, soft_purge, []},
-     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_app, brutal_purge, soft_purge, []},     
      {load_module, emqx_os_mon, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.10">>, [
+     {load_module, emqx_access_rule, brutal_purge, soft_purge, []},
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []},
      {load_module, emqx_message, brutal_purge, soft_purge, []},
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
      {load_module, emqx_frame, brutal_purge, soft_purge, []},
      {load_module, emqx_app, brutal_purge, soft_purge, []},
-     {load_module, emqx_os_mon, brutal_purge, soft_purge, []},
-     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_os_mon, brutal_purge, soft_purge, []},    
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
+   {<<"4.2.11">>, [
+     {load_module, emqx_access_rule, brutal_purge, soft_purge, []},
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []}
+   ]},
+   {<<"4.2.12">>, [     
+     {load_module, emqx_access_rule, brutal_purge, soft_purge, []},
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []}    
+   ]}
    {<<".*">>, []}
  ],
  [
@@ -231,6 +264,7 @@
      {load_module, emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module, emqx_app, brutal_purge, soft_purge, []},
      {load_module, emqx_misc,brutal_purge,soft_purge,[]},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {"4.2.1", [
@@ -260,6 +294,7 @@
      {load_module, emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module, emqx_app, brutal_purge, soft_purge, []},
      {load_module, emqx_misc,brutal_purge,soft_purge,[]},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.[23]">>, [
@@ -287,6 +322,7 @@
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.4">>, [
@@ -313,6 +349,7 @@
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.5">>, [
@@ -339,6 +376,7 @@
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.[6-7]">>, [
@@ -359,9 +397,11 @@
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.8">>, [
+     {load_module, emqx_access_rule, brutal_purge, soft_purge, []},
      {load_module, emqx_message, brutal_purge, soft_purge, []},
      {load_module, emqx_frame, brutal_purge, soft_purge, []},
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
@@ -374,9 +414,11 @@
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.9">>, [
+     {load_module, emqx_access_rule, brutal_purge, soft_purge, []},
      {load_module, emqx_message, brutal_purge, soft_purge, []},
      {load_module, emqx_frame, brutal_purge, soft_purge, []},
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
@@ -388,9 +430,11 @@
      {load_module, emqx_app, brutal_purge, soft_purge, []},
      {load_module, emqx_os_mon, brutal_purge, soft_purge, []},
      {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
    {<<"4.2.10">>, [
+     {load_module, emqx_access_rule, brutal_purge, soft_purge, []},
      {load_module, emqx_message, brutal_purge, soft_purge, []},
      {load_module, emqx_channel, brutal_purge, soft_purge, []},
      {load_module, emqx_frame, brutal_purge, soft_purge, []},
@@ -400,8 +444,21 @@
      {load_module, emqx_limiter, brutal_purge, soft_purge, []},
      {load_module, emqx_listeners, brutal_purge, soft_purge, []},
      {load_module, emqx_sys, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
      {load_module, emqx_plugins, brutal_purge, soft_purge, []}
    ]},
+   {<<"4.2.11">>, [
+     {load_module, emqx_access_rule, brutal_purge, soft_purge, []},
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []}
+   ]},
+   {<<"4.2.12">>, [     
+     {load_module, emqx_access_rule, brutal_purge, soft_purge, []},
+     {load_module, emqx_alarm, brutal_purge, soft_purge, []},
+     {load_module, emqx_packet, brutal_purge, soft_purge, []},
+     {load_module, emqx_banned, brutal_purge, soft_purge, []}
+   ]}
    {<<".*">>, []}
  ]
 }.
diff --git a/src/emqx_access_rule.erl b/src/emqx_access_rule.erl
index b0e1aeb0b..2cfec4f9b 100644
--- a/src/emqx_access_rule.erl
+++ b/src/emqx_access_rule.erl
@@ -133,9 +133,13 @@ match_who(_ClientInfo, _Who) ->
 match_topics(_ClientInfo, _Topic, []) ->
     false;
 match_topics(ClientInfo, Topic, [{pattern, PatternFilter}|Filters]) ->
-    TopicFilter = feed_var(ClientInfo, PatternFilter),
-    match_topic(emqx_topic:words(Topic), TopicFilter)
-        orelse match_topics(ClientInfo, Topic, Filters);
+    case feed_var(ClientInfo, PatternFilter) of
+        nomatch ->
+            false;
+        TopicFilter ->
+            match_topic(emqx_topic:words(Topic), TopicFilter)
+                orelse match_topics(ClientInfo, Topic, Filters)
+    end;
 match_topics(ClientInfo, Topic, [TopicFilter|Filters]) ->
    match_topic(emqx_topic:words(Topic), TopicFilter)
        orelse match_topics(ClientInfo, Topic, Filters).
@@ -149,14 +153,13 @@ feed_var(ClientInfo, Pattern) ->
     feed_var(ClientInfo, Pattern, []).
 feed_var(_ClientInfo, [], Acc) ->
     lists:reverse(Acc);
-feed_var(ClientInfo = #{clientid := undefined}, [<<"%c">>|Words], Acc) ->
-    feed_var(ClientInfo, Words, [<<"%c">>|Acc]);
+feed_var(#{clientid := undefined}, [<<"%c">>|_Words], _Acc) ->
+    nomatch;
 feed_var(ClientInfo = #{clientid := ClientId}, [<<"%c">>|Words], Acc) ->
     feed_var(ClientInfo, Words, [ClientId |Acc]);
-feed_var(ClientInfo = #{username := undefined}, [<<"%u">>|Words], Acc) ->
-    feed_var(ClientInfo, Words, [<<"%u">>|Acc]);
+feed_var(#{username := undefined}, [<<"%u">>|_Words], _Acc) ->
+    nomatch;
 feed_var(ClientInfo = #{username := Username}, [<<"%u">>|Words], Acc) ->
     feed_var(ClientInfo, Words, [Username|Acc]);
 feed_var(ClientInfo, [W|Words], Acc) ->
     feed_var(ClientInfo, Words, [W|Acc]).
-
diff --git a/src/emqx_alarm.erl b/src/emqx_alarm.erl
index d07354105..a2c51134d 100644
--- a/src/emqx_alarm.erl
+++ b/src/emqx_alarm.erl
@@ -113,8 +113,8 @@ mnesia(boot) ->
               {record_name, deactivated_alarm},
               {attributes, record_info(fields, deactivated_alarm)}]);
 mnesia(copy) ->
-    ok = ekka_mnesia:copy_table(?ACTIVATED_ALARM),
-    ok = ekka_mnesia:copy_table(?DEACTIVATED_ALARM).
+    ok = ekka_mnesia:copy_table(?ACTIVATED_ALARM, disc_copies),
+    ok = ekka_mnesia:copy_table(?DEACTIVATED_ALARM, disc_copies).
 
 %%--------------------------------------------------------------------
 %% API
diff --git a/src/emqx_banned.erl b/src/emqx_banned.erl
index 80f93be70..cbcd2e15f 100644
--- a/src/emqx_banned.erl
+++ b/src/emqx_banned.erl
@@ -62,7 +62,7 @@ mnesia(boot) ->
                 {storage_properties, [{ets, [{read_concurrency, true}]}]}]);
 
 mnesia(copy) ->
-    ok = ekka_mnesia:copy_table(?BANNED_TAB).
+    ok = ekka_mnesia:copy_table(?BANNED_TAB, disc_copies).
 
 %% @doc Start the banned server.
 -spec(start_link() -> startlink_ret()).
diff --git a/src/emqx_packet.erl b/src/emqx_packet.erl
index 015f95e0d..8d90a3edc 100644
--- a/src/emqx_packet.erl
+++ b/src/emqx_packet.erl
@@ -429,7 +429,7 @@ format_variable(undefined, _) ->
 format_variable(Variable, undefined) ->
     format_variable(Variable);
 format_variable(Variable, Payload) ->
-    io_lib:format("~s, Payload=~0p", [format_variable(Variable), Payload]).
+    [format_variable(Variable), "Payload=", Payload].
 
 format_variable(#mqtt_packet_connect{
                  proto_ver    = ProtoVer,