Add linux kernel interval tree

src/session/session_manager.cpp

@@ -527,6 +527,7 @@ static struct session *session_manager_new_tcp_session(struct session_manager *m
           return NULL;
      }
      mgr->stat.tcp_sess.nr_sess_used++;
+     SESSION_LOG_DEBUG("session %lu, c2s reassembler %p, s2c reassembler %p", session_get_id(sess), sess->c2s_reassembly, sess->s2c_reassembly);
 
      enum session_dir dir = tcp_hdr_get_ack_flag(hdr) ? SESSION_DIR_S2C : SESSION_DIR_C2S;
      enum session_state next_state = session_transition_run(SESSION_STATE_INIT, TCP_SYN);