fix: handle internal timeout errors in client Mqueue/Inflight APIs

apps/emqx_management/src/emqx_mgmt.erl

@@ -713,5 +713,17 @@ call_conn(ConnMod, Pid, Req) ->
         exit:{R, _} when R =:= shutdown; R =:= noproc ->
             {error, shutdown};
         exit:{{shutdown, _OOMInfo}, _Location} ->
-            {error, shutdown}
+            {error, shutdown};
+        exit:timeout ->
+            ?SLOG(
+                warning,
+                #{
+                    msg => "call_client_connection_process_timeout",
+                    request => Req,
+                    pid => Pid,
+                    module => ConnMod,
+                    stacktrace => erlang:process_info(Pid, current_stacktrace)
+                }
+            ),
+            {error, timeout}
     end.

apps/emqx_management/src/emqx_mgmt_api_clients.erl

@@ -1232,6 +1232,8 @@ list_client_msgs(MsgType, ClientID, QString) ->
                         code => 'NOT_IMPLEMENTED',
                         message => <<"API not implemented for persistent sessions">>
                     }};
+                {error, Reason} ->
+                    ?INTERNAL_ERROR(Reason);
                 {Msgs, Meta = #{}} when is_list(Msgs) ->
                     format_msgs_resp(MsgType, Msgs, Meta, QString)
             end