diff --git a/src/emqx.appup.src b/src/emqx.appup.src
index ae06cfc32..326c0aaf0 100644
--- a/src/emqx.appup.src
+++ b/src/emqx.appup.src
@@ -1,7 +1,8 @@
 %% -*- mode: erlang -*-
 {VSN,
   [{"4.3.9",
-    [{load_module,emqx_cm,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_pqueue,brutal_purge,soft_purge,[]},
      {load_module,emqx_mqueue,brutal_purge,soft_purge,[]},
@@ -9,7 +10,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.8",
-    [{load_module,emqx_cm,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_pqueue,brutal_purge,soft_purge,[]},
      {load_module,emqx_mqueue,brutal_purge,soft_purge,[]},
@@ -17,7 +19,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.7",
-    [{load_module,emqx_cm,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
@@ -27,7 +30,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.6",
-    [{load_module,emqx_cm,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
@@ -38,7 +42,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.5",
-    [{load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
      {load_module,emqx_cm,brutal_purge,soft_purge,[]},
@@ -50,7 +55,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.4",
-    [{load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
      {load_module,emqx_cm,brutal_purge,soft_purge,[]},
@@ -63,7 +69,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.3",
-    [{load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
      {load_module,emqx_packet,brutal_purge,soft_purge,[]},
      {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
@@ -141,7 +148,8 @@
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}],
   [{"4.3.9",
-    [{load_module,emqx_cm,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_pqueue,brutal_purge,soft_purge,[]},
      {load_module,emqx_mqueue,brutal_purge,soft_purge,[]},
@@ -149,7 +157,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.8",
-    [{load_module,emqx_cm,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_pqueue,brutal_purge,soft_purge,[]},
      {load_module,emqx_mqueue,brutal_purge,soft_purge,[]},
@@ -157,7 +166,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.7",
-    [{load_module,emqx_cm,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_pqueue,brutal_purge,soft_purge,[]},
      {load_module,emqx_mqueue,brutal_purge,soft_purge,[]},
@@ -167,7 +177,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.6",
-    [{load_module,emqx_cm,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_pqueue,brutal_purge,soft_purge,[]},
      {load_module,emqx_mqueue,brutal_purge,soft_purge,[]},
@@ -178,7 +189,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.5",
-    [{load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_pqueue,brutal_purge,soft_purge,[]},
      {load_module,emqx_mqueue,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
@@ -190,7 +202,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.4",
-    [{load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_pqueue,brutal_purge,soft_purge,[]},
      {load_module,emqx_mqueue,brutal_purge,soft_purge,[]},
      {load_module,emqx_alarm_handler,brutal_purge,soft_purge,[]},
@@ -203,7 +216,8 @@
      {load_module,emqx_rpc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.3.3",
-    [{load_module,emqx_pqueue,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_pqueue,brutal_purge,soft_purge,[]},
      {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,[]},
diff --git a/src/emqx_channel.erl b/src/emqx_channel.erl
index e3cbff692..7bfef472d 100644
--- a/src/emqx_channel.erl
+++ b/src/emqx_channel.erl
@@ -977,8 +977,11 @@ handle_info({sock_closed, Reason}, Channel =
         Shutdown -> Shutdown
     end;
 
-handle_info({sock_closed, Reason}, Channel = #channel{conn_state = disconnected}) ->
-    ?LOG(error, "Unexpected sock_closed: ~p", [Reason]),
+handle_info({sock_closed, _Reason}, Channel = #channel{conn_state = disconnected}) ->
+    %% Since sock_closed messages can be generated multiple times,
+    %% we can simply ignore errors of this type in the disconnected state.
+    %% e.g. when the socket send function returns an error, there is already
+    %% a tcp_closed delivered to the process mailbox
     {ok, Channel};
 
 handle_info(clean_acl_cache, Channel) ->