fix paging: add timeout to discard unsuccessful paging

Currently, if there is no reply from the BSS / RNC, a subscriber will remain as
"already paged" forever, and is never going to be paged again. Even on IMSI
Detach, the pending request will keep a ref count on the vlr_subscr.

Add a paging timeout, as gsm_network->paging_timeout and in the VTY on the
'msc' node as 'paging timeout (default|<1-65535>'. (There is a 'network' /
'T3113' in OsmoBSC, but to not confuse the two, give this a different name.)

Add test_ms_timeout_paging() test to verify the timeout works.

I hit this while testing Paging across multiple hNodeB, when a UE lost
connection to the hNodeB. I noticed that no matter how long I wait, no Paging
is sent out anymore, and found this embarrassing issue. Good grief...

The choice of 10 seconds is taken from https://osmocom.org/issues/2756

Change-Id: I2db6f1e2ad341cf9c2cc7a21ec2fca0bae5b2db5

include/osmocom/msc/gsm_data.h

@@ -344,6 +344,7 @@ enum gsm_auth_policy {
 	GSM_AUTH_POLICY_REGEXP, /* accept IMSIs matching given regexp */
 };
 
+#define MSC_PAGING_RESPONSE_TIMER_DEFAULT 10
 
 struct gsm_tz {
 	int override; /* if 0, use system's time zone instead. */
@@ -408,6 +409,7 @@ struct gsm_network {
 	unsigned int num_bts;
 	struct llist_head bts_list;
 
+	unsigned int paging_response_timer;
 
 	/* timer to expire old location updates */
 	struct osmo_timer_list subscr_expire_timer;

include/osmocom/msc/vlr.h

@@ -157,6 +157,7 @@ struct vlr_subscr {
 	struct {
 		/* pending requests */
 		bool is_paging;
+		struct osmo_timer_list paging_response_timer;
 		/* list of struct subscr_request */
 		struct llist_head requests;
 		uint8_t lac;

src/libcommon-cs/common_cs.c

@@ -60,6 +60,8 @@ struct gsm_network *gsm_network_init(void *ctx,
 	/* Use 30 min periodic update interval as sane default */
 	net->t3212 = 5;
 
+	net->paging_response_timer = MSC_PAGING_RESPONSE_TIMER_DEFAULT;
+
 	INIT_LLIST_HEAD(&net->trans_list);
 	INIT_LLIST_HEAD(&net->upqueue);
 	INIT_LLIST_HEAD(&net->subscr_conns);

src/libmsc/gsm_subscriber.c

@@ -76,7 +76,10 @@ int subscr_paging_dispatch(unsigned int hooknum, unsigned int event,
 		return -EINVAL;
 	}
 
-	if (event == GSM_PAGING_SUCCEEDED)
+	osmo_timer_del(&vsub->cs.paging_response_timer);
+
+	if (event == GSM_PAGING_SUCCEEDED
+	    || event == GSM_PAGING_EXPIRED)
 		msc_stop_paging(vsub);
 
 	/* Inform parts of the system we don't know */
@@ -126,6 +129,12 @@ int msc_paging_request(struct vlr_subscr *vsub)
 	return -EINVAL;
 }
 
+static void paging_response_timer_cb(void *data)
+{
+	struct vlr_subscr *vsub = data;
+	subscr_paging_dispatch(GSM_HOOK_RR_PAGING, GSM_PAGING_EXPIRED, NULL, NULL, vsub);
+}
+
 /*! \brief Start a paging request for vsub, call cbfn(param) when done.
  * \param vsub  subscriber to page.
  * \param cbfn  function to call when the conn is established.
@@ -138,6 +147,7 @@ struct subscr_request *subscr_request_conn(struct vlr_subscr *vsub,
 {
 	int rc;
 	struct subscr_request *request;
+	struct gsm_network *net = vsub->vlr->user_ctx;
 
 	/* Start paging.. we know it is async so we can do it before */
 	if (!vsub->cs.is_paging) {
@@ -152,6 +162,8 @@ struct subscr_request *subscr_request_conn(struct vlr_subscr *vsub,
 		/* reduced on the first paging callback */
 		vlr_subscr_get(vsub);
 		vsub->cs.is_paging = true;
+		osmo_timer_setup(&vsub->cs.paging_response_timer, paging_response_timer_cb, vsub);
+		osmo_timer_schedule(&vsub->cs.paging_response_timer, net->paging_response_timer, 0);
 	} else {
 		LOGP(DMM, LOGL_DEBUG, "Subscriber %s already paged.\n",
 			vlr_subscr_name(vsub));

src/libmsc/msc_vty.c

@@ -109,6 +109,22 @@ DEFUN(cfg_msc_auth_tuple_reuse_on_error, cfg_msc_auth_tuple_reuse_on_error_cmd,
 	return CMD_SUCCESS;
 }
 
+DEFUN(cfg_msc_paging_response_timer, cfg_msc_paging_response_timer_cmd,
+      "paging response-timer (default|<1-65535>)",
+      "Configure Paging\n"
+      "Set Paging timeout, the minimum time to pass between (unsuccessful) Pagings sent towards"
+      " BSS or RNC\n"
+      "Set to default timeout (" OSMO_STRINGIFY_VAL(MSC_PAGING_RESPONSE_TIMER_DEFAULT) " seconds)\n"
+      "Set paging timeout in seconds\n")
+{
+	struct gsm_network *gsmnet = gsmnet_from_vty(vty);
+	if (!strcmp(argv[1], "default"))
+		gsmnet->paging_response_timer = MSC_PAGING_RESPONSE_TIMER_DEFAULT;
+	else
+		gsmnet->paging_response_timer = atoi(argv[0]);
+	return CMD_SUCCESS;
+}
+
 static int config_write_msc(struct vty *vty)
 {
 	struct gsm_network *gsmnet = gsmnet_from_vty(vty);
@@ -130,6 +146,9 @@ static int config_write_msc(struct vty *vty)
 		vty_out(vty, " auth-tuple-reuse-on-error 1%s",
 			VTY_NEWLINE);
 
+	if (gsmnet->paging_response_timer != MSC_PAGING_RESPONSE_TIMER_DEFAULT)
+		vty_out(vty, " paging response-timer %u%s", gsmnet->paging_response_timer, VTY_NEWLINE);
+
 	mgcp_client_config_write(vty, " ");
 #ifdef BUILD_IU
 	ranap_iu_vty_config_write(vty, " ");
@@ -186,6 +205,7 @@ void msc_vty_init(struct gsm_network *msc_network)
 	install_element(MSC_NODE, &cfg_msc_auth_tuple_reuse_on_error_cmd);
 	install_element(MSC_NODE, &cfg_msc_cs7_instance_a_cmd);
 	install_element(MSC_NODE, &cfg_msc_cs7_instance_iu_cmd);
+	install_element(MSC_NODE, &cfg_msc_paging_response_timer_cmd);
 
 	mgcp_client_vty_init(msc_network, MSC_NODE, &msc_network->mgw.conf);
 #ifdef BUILD_IU

tests/msc_vlr/msc_vlr_test_ms_timeout.c

@@ -182,8 +182,101 @@ void test_ms_timeout_cm_auth_resp()
 	comment_end();
 }
 
+void test_ms_timeout_paging()
+{
+	struct vlr_subscr *vsub;
+	const char *imsi = "901700000004620";
+
+	rx_from_ran = RAN_GERAN_A;
+
+	comment_start();
+
+	fake_time_start();
+
+	btw("Location Update request causes a GSUP LU request to HLR");
+	lu_result_sent = RES_NONE;
+	gsup_expect_tx("04010809710000004026f0");
+	ms_sends_msg("050802008168000130089910070000006402");
+	OSMO_ASSERT(gsup_tx_confirmed);
+	VERBOSE_ASSERT(lu_result_sent, == RES_NONE, "%d");
+
+	btw("HLR sends _INSERT_DATA_REQUEST, VLR responds with _INSERT_DATA_RESULT");
+	gsup_rx("10010809710000004026f00804036470f1",
+		"12010809710000004026f0");
+	VERBOSE_ASSERT(lu_result_sent, == RES_NONE, "%d");
+
+	btw("HLR also sends GSUP _UPDATE_LOCATION_RESULT");
+	expect_bssap_clear();
+	gsup_rx("06010809710000004026f0", NULL);
+
+	btw("LU was successful, and the conn has already been closed");
+	VERBOSE_ASSERT(lu_result_sent, == RES_ACCEPT, "%d");
+	VERBOSE_ASSERT(bssap_clear_sent, == true, "%d");
+	EXPECT_CONN_COUNT(0);
+
+	BTW("an SMS is sent, MS is paged");
+	paging_expect_imsi(imsi);
+	paging_sent = false;
+	vsub = vlr_subscr_find_by_imsi(net->vlr, imsi);
+	OSMO_ASSERT(vsub);
+	VERBOSE_ASSERT(llist_count(&vsub->cs.requests), == 0, "%d");
+
+	send_sms(vsub, vsub,
+		 "Privacy in residential applications is a desirable"
+		 " marketing option.");
+
+	VERBOSE_ASSERT(llist_count(&vsub->cs.requests), == 1, "%d");
+	vlr_subscr_put(vsub);
+	vsub = NULL;
+	VERBOSE_ASSERT(paging_sent, == true, "%d");
+	VERBOSE_ASSERT(paging_stopped, == false, "%d");
+
+	btw("time passes and no paging result is received");
+
+	fake_time_passes(MSC_PAGING_RESPONSE_TIMER_DEFAULT - 1, 0);
+
+	btw("the paging timeout has not yet expired");
+	VERBOSE_ASSERT(paging_stopped, == false, "%d");
+	vsub = vlr_subscr_find_by_imsi(net->vlr, imsi);
+	OSMO_ASSERT(vsub);
+	VERBOSE_ASSERT(vsub->cs.is_paging, == true, "%d");
+	btw("another request is added to the list but does not cause another paging");
+	paging_sent = false;
+	paging_expect_imsi(NULL);
+	send_sms(vsub, vsub,
+		 "One paging ought to be enough for anyone.");
+	VERBOSE_ASSERT(llist_count(&vsub->cs.requests), == 2, "%d");
+	vlr_subscr_put(vsub);
+	vsub = NULL;
+	VERBOSE_ASSERT(paging_sent, == false, "%d");
+
+	btw("the paging timeout expires, the paging as well as the requests are canceled");
+	fake_time_passes(2, 0);
+	VERBOSE_ASSERT(paging_stopped, == true, "%d");
+
+	vsub = vlr_subscr_find_by_imsi(net->vlr, imsi);
+	OSMO_ASSERT(vsub);
+	VERBOSE_ASSERT(vsub->cs.is_paging, == false, "%d");
+	VERBOSE_ASSERT(llist_count(&vsub->cs.requests), == 0, "%d");
+	vlr_subscr_put(vsub);
+	vsub = NULL;
+
+	BTW("subscriber detaches");
+	expect_bssap_clear();
+	ms_sends_msg("050130089910070000006402");
+	VERBOSE_ASSERT(bssap_clear_sent, == true, "%d");
+
+	vsub = vlr_subscr_find_by_imsi(net->vlr, imsi);
+	OSMO_ASSERT(!vsub);
+
+	EXPECT_CONN_COUNT(0);
+	clear_vlr();
+	comment_end();
+}
+
 msc_vlr_test_func_t msc_vlr_tests[] = {
 	test_ms_timeout_lu_auth_resp,
 	test_ms_timeout_cm_auth_resp,
+	test_ms_timeout_paging,
 	NULL
 };

tests/msc_vlr/msc_vlr_test_ms_timeout.err

@@ -337,6 +337,173 @@ DREF freeing VLR subscr MSISDN:46071
 full talloc report on 'msgb' (total      0 bytes in   1 blocks)
 talloc_total_blocks(tall_bsc_ctx) == 9
 
+===== test_ms_timeout_paging
+- Total time passed: 0.000000 s
+- Location Update request causes a GSUP LU request to HLR
+  MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
+  new conn
+DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
+DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
+DREF unknown: MSC conn use + fsm == 2 (0x5)
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_INIT}: Allocated
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
+DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000004620 type=IMSI ATTACH
+DMM LU/new-LAC: 1/23
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_IDLE}: Allocated
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_IDLE}: is child of Subscr_Conn(901700000004620)
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_IDLE}: rev=GSM net=GERAN (no Auth)
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_IDLE}: Received Event VLR_ULA_E_UPDATE_LA
+DREF VLR subscr unknown usage increases to: 1
+DVLR set IMSI on subscriber; IMSI=901700000004620 id=901700000004620
+DVLR New subscr, IMSI: 901700000004620
+DREF VLR subscr IMSI:901700000004620 usage increases to: 2
+DREF VLR subscr IMSI:901700000004620 usage decreases to: 1
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_IDLE}: vlr_loc_upd_node1()
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_IDLE}: vlr_loc_upd_post_auth()
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_IDLE}: vlr_loc_upd_post_ciph()
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_IDLE}: vlr_loc_upd_node_4()
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_IDLE}: state_chg to VLR_ULA_S_WAIT_HLR_UPD
+DVLR upd_hlr_vlr_fsm(901700000004620){UPD_HLR_VLR_S_INIT}: Allocated
+DVLR upd_hlr_vlr_fsm(901700000004620){UPD_HLR_VLR_S_INIT}: is child of vlr_lu_fsm(901700000004620)
+DVLR upd_hlr_vlr_fsm(901700000004620){UPD_HLR_VLR_S_INIT}: Received Event UPD_HLR_VLR_E_START
+DVLR GSUP tx: 04010809710000004026f0
+GSUP --> HLR: OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST: 04010809710000004026f0
+DVLR upd_hlr_vlr_fsm(901700000004620){UPD_HLR_VLR_S_INIT}: state_chg to UPD_HLR_VLR_S_WAIT_FOR_DATA
+DMM IMSI:901700000004620: bump: conn still being established (SUBSCR_CONN_S_NEW)
+DREF IMSI:901700000004620: MSC conn use - compl_l3 == 1 (0x4)
+  lu_result_sent == 0
+- HLR sends _INSERT_DATA_REQUEST, VLR responds with _INSERT_DATA_RESULT
+<-- GSUP rx OSMO_GSUP_MSGT_INSERT_DATA_REQUEST: 10010809710000004026f00804036470f1
+DVLR GSUP rx 17: 10010809710000004026f00804036470f1
+DREF VLR subscr IMSI:901700000004620 usage increases to: 2
+DVLR IMSI:901700000004620 has MSISDN:46071
+DVLR GSUP tx: 12010809710000004026f0
+GSUP --> HLR: OSMO_GSUP_MSGT_INSERT_DATA_RESULT: 12010809710000004026f0
+DREF VLR subscr MSISDN:46071 usage decreases to: 1
+<-- GSUP rx OSMO_GSUP_MSGT_INSERT_DATA_REQUEST: vlr_gsupc_read_cb() returns 0
+  lu_result_sent == 0
+- HLR also sends GSUP _UPDATE_LOCATION_RESULT
+<-- GSUP rx OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: 06010809710000004026f0
+DVLR GSUP rx 11: 06010809710000004026f0
+DREF VLR subscr MSISDN:46071 usage increases to: 2
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_WAIT_HLR_UPD}: Received Event VLR_ULA_E_HLR_LU_RES
+DVLR upd_hlr_vlr_fsm(901700000004620){UPD_HLR_VLR_S_WAIT_FOR_DATA}: Received Event UPD_HLR_VLR_E_UPD_LOC_ACK
+DVLR upd_hlr_vlr_fsm(901700000004620){UPD_HLR_VLR_S_WAIT_FOR_DATA}: state_chg to UPD_HLR_VLR_S_DONE
+DVLR upd_hlr_vlr_fsm(901700000004620){UPD_HLR_VLR_S_DONE}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
+DVLR upd_hlr_vlr_fsm(901700000004620){UPD_HLR_VLR_S_DONE}: Removing from parent vlr_lu_fsm(901700000004620)
+DVLR upd_hlr_vlr_fsm(901700000004620){UPD_HLR_VLR_S_DONE}: Freeing instance
+DVLR upd_hlr_vlr_fsm(901700000004620){UPD_HLR_VLR_S_DONE}: Deallocated
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_WAIT_HLR_UPD}: Received Event VLR_ULA_E_UPD_HLR_COMPL
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_WAIT_HLR_UPD}: state_chg to VLR_ULA_S_WAIT_LU_COMPL
+DVLR lu_compl_vlr_fsm(901700000004620){LU_COMPL_VLR_S_INIT}: Allocated
+DVLR lu_compl_vlr_fsm(901700000004620){LU_COMPL_VLR_S_INIT}: is child of vlr_lu_fsm(901700000004620)
+DVLR lu_compl_vlr_fsm(901700000004620){LU_COMPL_VLR_S_INIT}: Received Event LU_COMPL_VLR_E_START
+DVLR lu_compl_vlr_fsm(901700000004620){LU_COMPL_VLR_S_INIT}: state_chg to LU_COMPL_VLR_S_WAIT_SUB_PRES
+DVLR sub_pres_vlr_fsm(901700000004620){SUB_PRES_VLR_S_INIT}: Allocated
+DVLR sub_pres_vlr_fsm(901700000004620){SUB_PRES_VLR_S_INIT}: is child of lu_compl_vlr_fsm(901700000004620)
+DVLR sub_pres_vlr_fsm(901700000004620){SUB_PRES_VLR_S_INIT}: Received Event SUB_PRES_VLR_E_START
+DVLR sub_pres_vlr_fsm(901700000004620){SUB_PRES_VLR_S_INIT}: state_chg to SUB_PRES_VLR_S_DONE
+DVLR sub_pres_vlr_fsm(901700000004620){SUB_PRES_VLR_S_DONE}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
+DVLR sub_pres_vlr_fsm(901700000004620){SUB_PRES_VLR_S_DONE}: Removing from parent lu_compl_vlr_fsm(901700000004620)
+DVLR sub_pres_vlr_fsm(901700000004620){SUB_PRES_VLR_S_DONE}: Freeing instance
+DVLR sub_pres_vlr_fsm(901700000004620){SUB_PRES_VLR_S_DONE}: Deallocated
+DVLR lu_compl_vlr_fsm(901700000004620){LU_COMPL_VLR_S_WAIT_SUB_PRES}: Received Event LU_COMPL_VLR_E_SUB_PRES_COMPL
+- sending LU Accept for MSISDN:46071
+DREF VLR subscr MSISDN:46071 usage increases to: 3
+DVLR lu_compl_vlr_fsm(901700000004620){LU_COMPL_VLR_S_WAIT_SUB_PRES}: state_chg to LU_COMPL_VLR_S_DONE
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_LU_COMPL_SUCCESS
+DVLR lu_compl_vlr_fsm(901700000004620){LU_COMPL_VLR_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
+DVLR lu_compl_vlr_fsm(901700000004620){LU_COMPL_VLR_S_DONE}: Removing from parent vlr_lu_fsm(901700000004620)
+DVLR lu_compl_vlr_fsm(901700000004620){LU_COMPL_VLR_S_DONE}: Freeing instance
+DVLR lu_compl_vlr_fsm(901700000004620){LU_COMPL_VLR_S_DONE}: Deallocated
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_NEW}: SUBSCR_CONN_FROM_LU
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_BUMP
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_ACCEPTED}: bump: releasing conn
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000004620)
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_DONE}: Freeing instance
+DVLR vlr_lu_fsm(901700000004620){VLR_ULA_S_DONE}: Deallocated
+DMM msc_subscr_conn_close(vsub=MSISDN:46071, cause=2): no conn fsm, releasing directly without release event.
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF MSISDN:46071: MSC conn use - fsm == 0 (0x0)
+DRLL subscr MSISDN:46071: Freeing subscriber connection
+DREF VLR subscr MSISDN:46071 usage decreases to: 2
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_RELEASED}: Freeing instance
+DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_RELEASED}: Deallocated
+DREF VLR subscr MSISDN:46071 usage decreases to: 1
+<-- GSUP rx OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: vlr_gsupc_read_cb() returns 0
+- LU was successful, and the conn has already been closed
+  lu_result_sent == 1
+  bssap_clear_sent == 1
+  llist_count(&net->subscr_conns) == 0
+---
+- an SMS is sent, MS is paged
+DREF VLR subscr MSISDN:46071 usage increases to: 2
+  llist_count(&vsub->cs.requests) == 0
+DREF VLR subscr MSISDN:46071 usage increases to: 3
+DMM Subscriber MSISDN:46071 not paged yet, start paging.
+  RAN_GERAN_A sends out paging request to IMSI 901700000004620, TMSI 0xffffffff, LAC 23
+  strcmp(paging_expecting_imsi, imsi) == 0
+DREF VLR subscr MSISDN:46071 usage increases to: 4
+  llist_count(&vsub->cs.requests) == 1
+DREF VLR subscr MSISDN:46071 usage decreases to: 3
+  paging_sent == 1
+  paging_stopped == 0
+- time passes and no paging result is received
+- Total time passed: 9.000000 s
+- the paging timeout has not yet expired
+  paging_stopped == 0
+DREF VLR subscr MSISDN:46071 usage increases to: 4
+  vsub->cs.is_paging == 1
+- another request is added to the list but does not cause another paging
+DREF VLR subscr MSISDN:46071 usage increases to: 5
+DMM Subscriber MSISDN:46071 already paged.
+  llist_count(&vsub->cs.requests) == 2
+DREF VLR subscr MSISDN:46071 usage decreases to: 4
+  paging_sent == 0
+- the paging timeout expires, the paging as well as the requests are canceled
+- Total time passed: 11.000000 s
+DPAG Paging failure for MSISDN:46071 (event=1)
+DPAG Calling paging cbfn.
+DREF VLR subscr MSISDN:46071 usage decreases to: 3
+DPAG Calling paging cbfn.
+DREF VLR subscr MSISDN:46071 usage decreases to: 2
+DREF VLR subscr MSISDN:46071 usage decreases to: 1
+  paging_stopped == 1
+DREF VLR subscr MSISDN:46071 usage increases to: 2
+  vsub->cs.is_paging == 0
+  llist_count(&vsub->cs.requests) == 0
+DREF VLR subscr MSISDN:46071 usage decreases to: 1
+---
+- subscriber detaches
+  MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_IMSI_DETACH_IND
+  new conn
+DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
+DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
+DMM IMSI DETACH INDICATION: MI(IMSI)=901700000004620
+DREF VLR subscr MSISDN:46071 usage increases to: 2
+DMM IMSI DETACH for MSISDN:46071
+DREF VLR subscr MSISDN:46071 usage decreases to: 1
+DREF VLR subscr MSISDN:46071 usage decreases to: 0
+DREF freeing VLR subscr MSISDN:46071
+DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
+- BSSAP Clear --RAN_GERAN_A--> MS
+DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
+DRLL Freeing subscriber connection with NULL subscriber
+  bssap_clear_sent == 1
+  llist_count(&net->subscr_conns) == 0
+===== test_ms_timeout_paging: SUCCESS
+
+full talloc report on 'msgb' (total      0 bytes in   1 blocks)
+talloc_total_blocks(tall_bsc_ctx) == 9
+
 full talloc report on 'msgb' (total      0 bytes in   1 blocks)
 talloc_total_blocks(tall_bsc_ctx) == 9