Merge branch '2.3' into 2.4

server/modules/protocol/MySQL/mariadbclient/mysql_client.cc

@@ -1709,6 +1709,11 @@ static int gw_client_hangup_event(DCB* dcb)
                 session_dump_statements(session);
             }
 
+            if (session_get_session_trace())
+            {
+                session_dump_log(session);
+            }
+
             // The client did not send a COM_QUIT packet
             std::string errmsg {"Connection killed by MaxScale"};
             std::string extra {session_get_close_reason(dcb->session)};

server/modules/protocol/MySQL/rwbackend.cc

@@ -304,6 +304,7 @@ void RWBackend::process_packets(GWBUF* result)
     auto it = buffer.begin();
     MXB_AT_DEBUG(size_t total_len = buffer.length());
     MXB_AT_DEBUG(size_t used_len = 0);
+    mxb_assert(dcb()->session->service->capabilities & (RCAP_TYPE_PACKET_OUTPUT | RCAP_TYPE_STMT_OUTPUT));
 
     while (it != buffer.end())
     {