diff --git a/CHANGES-4.3.md b/CHANGES-4.3.md
index 59391ce5f..858fc00e6 100644
--- a/CHANGES-4.3.md
+++ b/CHANGES-4.3.md
@@ -41,6 +41,7 @@ File format:
   [ekka-158](https://github.com/emqx/ekka/pull/158)
 * Add regular expression check ^[0-9A-Za-z_\-]+$ for node name [#7979]
 * Fix `node_dump` variable sourcing. [#8026]
+* Fix heap size is growing too fast when trace large message.
 * Support customized timestamp format of the log messages.
 
 ## v4.3.14
diff --git a/src/emqx.appup.src b/src/emqx.appup.src
index e55fda58e..cc913072e 100644
--- a/src/emqx.appup.src
+++ b/src/emqx.appup.src
@@ -8,6 +8,7 @@
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
      {add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_session,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
@@ -24,6 +25,7 @@
    {"4.3.14",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
      {load_module,emqx_session,brutal_purge,soft_purge,[]},
      {load_module,emqx_channel,brutal_purge,soft_purge,[]},
@@ -44,6 +46,7 @@
    {"4.3.13",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_session,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
@@ -70,6 +73,7 @@
    {"4.3.12",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
@@ -100,6 +104,7 @@
    {"4.3.11",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
@@ -132,6 +137,7 @@
    {"4.3.10",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
@@ -164,6 +170,7 @@
    {"4.3.9",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
@@ -200,6 +207,7 @@
    {"4.3.8",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
@@ -236,6 +244,7 @@
    {"4.3.7",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
@@ -272,6 +281,7 @@
    {"4.3.6",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
@@ -308,6 +318,7 @@
    {"4.3.5",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
      {load_module,emqx_plugins,brutal_purge,soft_purge,[]},
@@ -344,6 +355,7 @@
    {"4.3.4",
     [{add_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
      {load_module,emqx_plugins,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
@@ -540,6 +552,7 @@
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
      {delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
@@ -555,6 +568,7 @@
    {"4.3.14",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
@@ -574,6 +588,7 @@
    {"4.3.13",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_session,brutal_purge,soft_purge,[]},
@@ -599,6 +614,7 @@
    {"4.3.12",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
@@ -627,6 +643,7 @@
    {"4.3.11",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
@@ -657,6 +674,7 @@
    {"4.3.10",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
@@ -687,6 +705,7 @@
    {"4.3.9",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
@@ -721,6 +740,7 @@
    {"4.3.8",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
@@ -755,6 +775,7 @@
    {"4.3.7",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
@@ -789,6 +810,7 @@
    {"4.3.6",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_access_rule,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
@@ -823,6 +845,7 @@
    {"4.3.5",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
      {load_module,emqx_plugins,brutal_purge,soft_purge,[]},
@@ -857,6 +880,7 @@
    {"4.3.4",
     [{delete_module,emqx_calendar},
      {load_module,emqx_logger_textfmt,brutal_purge,soft_purge,[]},
+     {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_hooks,brutal_purge,soft_purge,[]},
      {load_module,emqx_plugins,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
diff --git a/src/emqx_packet.erl b/src/emqx_packet.erl
index 4665e7733..889619f05 100644
--- a/src/emqx_packet.erl
+++ b/src/emqx_packet.erl
@@ -442,18 +442,18 @@ format_header(#mqtt_packet_header{type = Type,
                                   dup = Dup,
                                   qos = QoS,
                                   retain = Retain}, S) ->
-    S1 = case S == undefined of
-             true -> <<>>;
-             false -> [", ", S]
-         end,
-    io_lib:format("~s(Q~p, R~p, D~p~s)", [type_name(Type), QoS, i(Retain), i(Dup), S1]).
+    Header = io_lib:format("~s(Q~p, R~p, D~p", [type_name(Type), QoS, i(Retain), i(Dup)]),
+    case S == undefined of
+        true -> [Header, ")"];
+        false -> [Header, S, ")"]
+    end.
 
 format_variable(undefined, _) ->
     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,
@@ -520,4 +520,3 @@ format_password(_Password) -> '******'.
 i(true)  -> 1;
 i(false) -> 0;
 i(I) when is_integer(I) -> I.
-