diff --git a/tests/msc_vlr/msc_vlr_test_rest.err b/tests/msc_vlr/msc_vlr_test_rest.err
index be96237..9989c66 100644
--- a/tests/msc_vlr/msc_vlr_test_rest.err
+++ b/tests/msc_vlr/msc_vlr_test_rest.err
@@ -19,7 +19,9 @@
 DRLL Dispatching 04.08 message SMS:0x01 (0x9:0x1)
 DRLL subscr unknown: Message not permitted for initial conn: SMS:0x01
 - fake: acceptance
-DREF VLR subscr unknown usage increases to: 1
+DREF VLR subscr unknown + conn: now used by 1 (conn)
+DVLR set IMSI on subscriber; IMSI=135111 id=135111
+DVLR New subscr, IMSI: 135111
 DMM RAN_conn{RAN_CONN_S_NEW}: state_chg to RAN_CONN_S_ACCEPTED
 DMM RAN_conn{RAN_CONN_S_ACCEPTED}: ran_conn_fsm_has_active_transactions: silent call still active
   llist_count(&net->ran_conns) == 1
@@ -27,21 +29,21 @@
 - CLOSE event marks conn_fsm as released and frees the conn
 DMM RAN_conn{RAN_CONN_S_ACCEPTED}: Received Event RAN_CONN_E_CN_CLOSE
 DMM RAN_conn{RAN_CONN_S_ACCEPTED}: state_chg to RAN_CONN_S_RELEASING
-DREF unknown: MSC conn use + release == 1 (0x100: release)
-DREF VLR subscr unknown usage increases to: 2
-DREF VLR subscr unknown usage decreases to: 1
+DREF IMSI-135111: MSC conn use + release == 1 (0x100: release)
+DREF VLR subscr IMSI-135111 + vlr_subscr_cancel_attach_fsm: now used by 2 (conn,vlr_subscr_cancel_attach_fsm)
+DREF VLR subscr IMSI-135111 - vlr_subscr_cancel_attach_fsm: now used by 1 (conn)
 - BSSAP Clear --GERAN-A--> MS
   bssap_clear_sent == 1
 - BSS sends BSSMAP Clear Complete
-DREF unknown: MSC conn use - release == 0 (0x0: )
+DREF IMSI-135111: MSC conn use - release == 0 (0x0: )
 DMM RAN_conn{RAN_CONN_S_RELEASING}: Received Event RAN_CONN_E_UNUSED
 DMM RAN_conn{RAN_CONN_S_RELEASING}: state_chg to RAN_CONN_S_RELEASED
 DMM RAN_conn{RAN_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DMM RAN_conn{RAN_CONN_S_RELEASED}: ran_conn_fsm_has_active_transactions: silent call still active
 DMM RAN_conn{RAN_CONN_S_RELEASED}: Deallocating despite active transactions
-DRLL unknown: Freeing RAN connection
-DREF VLR subscr unknown usage decreases to: 0
-DREF freeing VLR subscr unknown
+DRLL IMSI-135111: Freeing RAN connection
+DREF VLR subscr IMSI-135111 - conn: now used by 0 (-)
+DREF freeing VLR subscr IMSI-135111
 DMM RAN_conn{RAN_CONN_S_RELEASED}: Deallocated, including all deferred deallocations
   llist_count(&net->ran_conns) == 0
 ===== test_early_stage: SUCCESS
@@ -104,12 +106,12 @@
 DVLR vlr_lu_fsm(IMSI-901700000004620:GERAN-A-0:LU){VLR_ULA_S_IDLE}: is child of RAN_conn(IMSI-901700000004620:GERAN-A-0:LU)
 DVLR vlr_lu_fsm(IMSI-901700000004620:GERAN-A-0:LU){VLR_ULA_S_IDLE}: rev=GSM net=GERAN (no Auth)
 DVLR vlr_lu_fsm(IMSI-901700000004620:GERAN-A-0:LU){VLR_ULA_S_IDLE}: Received Event VLR_ULA_E_UPDATE_LA
-DREF VLR subscr unknown usage increases to: 1
+DREF VLR subscr unknown + _lu_fsm_associate_vsub: now used by 1 (_lu_fsm_associate_vsub)
 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 + conn: now used by 2 (_lu_fsm_associate_vsub,conn)
 DMM RAN_conn(IMSI-901700000004620:GERAN-A-0:LU){RAN_CONN_S_NEW}: Updated ID
-DREF VLR subscr IMSI-901700000004620 usage decreases to: 1
+DREF VLR subscr IMSI-901700000004620 - _lu_fsm_associate_vsub: now used by 1 (conn)
 DVLR vlr_lu_fsm(IMSI-901700000004620:GERAN-A-0:LU){VLR_ULA_S_IDLE}: vlr_loc_upd_node1()
 DVLR vlr_lu_fsm(IMSI-901700000004620:GERAN-A-0:LU){VLR_ULA_S_IDLE}: vlr_loc_upd_post_auth()
 DVLR vlr_lu_fsm(IMSI-901700000004620:GERAN-A-0:LU){VLR_ULA_S_IDLE}: vlr_loc_upd_post_ciph()
@@ -130,13 +132,13 @@
 - 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
+DREF VLR subscr IMSI-901700000004620 + vlr_gsupc_read_cb: now used by 2 (conn,vlr_gsupc_read_cb)
 DVLR IMSI:901700000004620 has MSISDN:46071
-DVLR SUBSCR(IMSI-901700000004620:MSISDN-46071) VLR: update for IMSI=901700000004620 (MSISDN=46071, used=2)
+DVLR SUBSCR(IMSI-901700000004620:MSISDN-46071) VLR: update for IMSI=901700000004620 (MSISDN=46071)
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){RAN_CONN_S_AUTH_CIPH}: Updated ID
 DVLR GSUP tx: 12010809710000004026f0
 GSUP --> HLR: OSMO_GSUP_MSGT_INSERT_DATA_RESULT: 12010809710000004026f0
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 1
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - vlr_gsupc_read_cb: now used by 1 (conn)
 <-- GSUP rx OSMO_GSUP_MSGT_INSERT_DATA_REQUEST: vlr_gsupc_read_cb() returns 0
   lu_result_sent == 0
 - having received subscriber data does not mean acceptance
@@ -154,7 +156,7 @@
 - HLR also sends GSUP _UPDATE_LOCATION_RESULT
 <-- GSUP rx OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: 06010809710000004026f0
 DVLR GSUP rx 11: 06010809710000004026f0
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage increases to: 2
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + vlr_gsupc_read_cb: now used by 2 (conn,vlr_gsupc_read_cb)
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){VLR_ULA_S_WAIT_HLR_UPD}: Received Event VLR_ULA_E_HLR_LU_RES
 DVLR upd_hlr_vlr_fsm(IMSI-901700000004620:GERAN-A-0:LU){UPD_HLR_VLR_S_WAIT_FOR_DATA}: Received Event UPD_HLR_VLR_E_UPD_LOC_ACK
 DVLR upd_hlr_vlr_fsm(IMSI-901700000004620:GERAN-A-0:LU){UPD_HLR_VLR_S_WAIT_FOR_DATA}: state_chg to UPD_HLR_VLR_S_DONE
@@ -168,7 +170,7 @@
 DVLR lu_compl_vlr_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){LU_COMPL_VLR_S_INIT}: state_chg to LU_COMPL_VLR_S_WAIT_SUB_PRES
 DVLR lu_compl_vlr_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){LU_COMPL_VLR_S_WAIT_SUB_PRES}: Received Event LU_COMPL_VLR_E_SUB_PRES_COMPL
 - sending LU Accept for IMSI-901700000004620:MSISDN-46071
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage increases to: 3
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + attached: now used by 3 (conn,vlr_gsupc_read_cb,attached)
 DVLR lu_compl_vlr_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){LU_COMPL_VLR_S_WAIT_SUB_PRES}: state_chg to LU_COMPL_VLR_S_DONE
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_LU_COMPL_SUCCESS
 DVLR lu_compl_vlr_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){LU_COMPL_VLR_S_DONE}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: upd_hlr_vlr_fsm(IMSI-901700000004620:GERAN-A-0:LU))
@@ -180,11 +182,11 @@
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){RAN_CONN_S_ACCEPTED}: Received Event RAN_CONN_E_UNUSED
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){RAN_CONN_S_ACCEPTED}: state_chg to RAN_CONN_S_RELEASING
 DREF IMSI-901700000004620:MSISDN-46071: MSC conn use + release == 1 (0x100: release)
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage increases to: 4
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 3
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + vlr_subscr_cancel_attach_fsm: now used by 4 (conn,vlr_gsupc_read_cb,attached,vlr_subscr_cancel_attach_fsm)
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - vlr_subscr_cancel_attach_fsm: now used by 3 (conn,vlr_gsupc_read_cb,attached)
 - BSSAP Clear --GERAN-A--> MS
 DVLR upd_hlr_vlr_fsm(IMSI-901700000004620:GERAN-A-0:LU){UPD_HLR_VLR_S_DONE}: Deallocated, including all deferred deallocations
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 2
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - vlr_gsupc_read_cb: now used by 2 (conn,attached)
 <-- GSUP rx OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: vlr_gsupc_read_cb() returns 0
   bssap_clear_sent == 1
 - LU was successful, and the conn has already been closed
@@ -199,7 +201,7 @@
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){VLR_ULA_S_DONE}: Deferring: will deallocate with RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU)
 DRLL IMSI-901700000004620:MSISDN-46071: Freeing RAN connection
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 1
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - conn: now used by 1 (attached)
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){RAN_CONN_S_RELEASED}: Deallocated, including all deferred deallocations
   llist_count(&net->ran_conns) == 0
 ---
@@ -217,10 +219,10 @@
 DVLR vlr_lu_fsm(IMSI-901700000004620:GERAN-A-0:LU){VLR_ULA_S_IDLE}: is child of RAN_conn(IMSI-901700000004620:GERAN-A-0:LU)
 DVLR vlr_lu_fsm(IMSI-901700000004620:GERAN-A-0:LU){VLR_ULA_S_IDLE}: rev=GSM net=GERAN (no Auth)
 DVLR vlr_lu_fsm(IMSI-901700000004620:GERAN-A-0:LU){VLR_ULA_S_IDLE}: Received Event VLR_ULA_E_UPDATE_LA
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage increases to: 2
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage increases to: 3
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + _lu_fsm_associate_vsub: now used by 2 (attached,_lu_fsm_associate_vsub)
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + conn: now used by 3 (attached,_lu_fsm_associate_vsub,conn)
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){RAN_CONN_S_NEW}: Updated ID
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 2
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - _lu_fsm_associate_vsub: now used by 2 (attached,conn)
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){VLR_ULA_S_IDLE}: vlr_loc_upd_node1()
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){VLR_ULA_S_IDLE}: vlr_loc_upd_post_auth()
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){VLR_ULA_S_IDLE}: vlr_loc_upd_post_ciph()
@@ -241,13 +243,13 @@
 - 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:MSISDN-46071 usage increases to: 3
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + vlr_gsupc_read_cb: now used by 3 (attached,conn,vlr_gsupc_read_cb)
 DVLR IMSI:901700000004620 has MSISDN:46071
-DVLR SUBSCR(IMSI-901700000004620:MSISDN-46071) VLR: update for IMSI=901700000004620 (MSISDN=46071, used=3)
+DVLR SUBSCR(IMSI-901700000004620:MSISDN-46071) VLR: update for IMSI=901700000004620 (MSISDN=46071)
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){RAN_CONN_S_AUTH_CIPH}: Updated ID
 DVLR GSUP tx: 12010809710000004026f0
 GSUP --> HLR: OSMO_GSUP_MSGT_INSERT_DATA_RESULT: 12010809710000004026f0
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 2
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - vlr_gsupc_read_cb: now used by 2 (attached,conn)
 <-- GSUP rx OSMO_GSUP_MSGT_INSERT_DATA_REQUEST: vlr_gsupc_read_cb() returns 0
   lu_result_sent == 0
 - having received subscriber data does not mean acceptance
@@ -265,7 +267,7 @@
 - HLR also sends GSUP _UPDATE_LOCATION_RESULT
 <-- GSUP rx OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: 06010809710000004026f0
 DVLR GSUP rx 11: 06010809710000004026f0
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage increases to: 3
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + vlr_gsupc_read_cb: now used by 3 (attached,conn,vlr_gsupc_read_cb)
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){VLR_ULA_S_WAIT_HLR_UPD}: Received Event VLR_ULA_E_HLR_LU_RES
 DVLR upd_hlr_vlr_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){UPD_HLR_VLR_S_WAIT_FOR_DATA}: Received Event UPD_HLR_VLR_E_UPD_LOC_ACK
 DVLR upd_hlr_vlr_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){UPD_HLR_VLR_S_WAIT_FOR_DATA}: state_chg to UPD_HLR_VLR_S_DONE
@@ -290,11 +292,11 @@
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){RAN_CONN_S_ACCEPTED}: Received Event RAN_CONN_E_UNUSED
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){RAN_CONN_S_ACCEPTED}: state_chg to RAN_CONN_S_RELEASING
 DREF IMSI-901700000004620:MSISDN-46071: MSC conn use + release == 1 (0x100: release)
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage increases to: 4
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 3
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + vlr_subscr_cancel_attach_fsm: now used by 4 (attached,conn,vlr_gsupc_read_cb,vlr_subscr_cancel_attach_fsm)
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - vlr_subscr_cancel_attach_fsm: now used by 3 (attached,conn,vlr_gsupc_read_cb)
 - BSSAP Clear --GERAN-A--> MS
 DVLR upd_hlr_vlr_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){UPD_HLR_VLR_S_DONE}: Deallocated, including all deferred deallocations
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 2
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - vlr_gsupc_read_cb: now used by 2 (attached,conn)
 <-- GSUP rx OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: vlr_gsupc_read_cb() returns 0
   bssap_clear_sent == 1
 - LU was successful, and the conn has already been closed
@@ -309,7 +311,7 @@
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){VLR_ULA_S_DONE}: Deferring: will deallocate with RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU)
 DRLL IMSI-901700000004620:MSISDN-46071: Freeing RAN connection
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 1
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - conn: now used by 1 (attached)
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:GERAN-A-0:LU){RAN_CONN_S_RELEASED}: Deallocated, including all deferred deallocations
   llist_count(&net->ran_conns) == 0
 ---
@@ -320,12 +322,12 @@
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1: compl_l3)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000004620
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage increases to: 2
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + gsm48_rx_mm_imsi_detach_ind: now used by 2 (attached,gsm48_rx_mm_imsi_detach_ind)
 DMM IMSI DETACH for IMSI-901700000004620:MSISDN-46071
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage increases to: 3
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 2
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 1
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071 usage decreases to: 0
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + vlr_subscr_cancel_attach_fsm: now used by 3 (attached,gsm48_rx_mm_imsi_detach_ind,vlr_subscr_cancel_attach_fsm)
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - vlr_subscr_cancel_attach_fsm: now used by 2 (attached,gsm48_rx_mm_imsi_detach_ind)
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - attached: now used by 1 (gsm48_rx_mm_imsi_detach_ind)
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071 - gsm48_rx_mm_imsi_detach_ind: now used by 0 (-)
 DREF freeing VLR subscr IMSI-901700000004620:MSISDN-46071
 DMM RAN_conn{RAN_CONN_S_NEW}: Received Event RAN_CONN_E_CN_CLOSE
 DMM RAN_conn{RAN_CONN_S_NEW}: state_chg to RAN_CONN_S_RELEASING
@@ -360,11 +362,11 @@
 DVLR vlr_lu_fsm(TMSI-0x23422342:GERAN-A-0:LU){VLR_ULA_S_IDLE}: is child of RAN_conn(TMSI-0x23422342:GERAN-A-0:LU)
 DVLR vlr_lu_fsm(TMSI-0x23422342:GERAN-A-0:LU){VLR_ULA_S_IDLE}: rev=GSM net=GERAN (no Auth)
 DVLR vlr_lu_fsm(TMSI-0x23422342:GERAN-A-0:LU){VLR_ULA_S_IDLE}: Received Event VLR_ULA_E_UPDATE_LA
-DREF VLR subscr unknown usage increases to: 1
+DREF VLR subscr unknown + _lu_fsm_associate_vsub: now used by 1 (_lu_fsm_associate_vsub)
 DVLR New subscr, TMSI: 0x23422342
-DREF VLR subscr TMSI-0x23422342 usage increases to: 2
+DREF VLR subscr TMSI-0x23422342 + conn: now used by 2 (_lu_fsm_associate_vsub,conn)
 DMM RAN_conn(TMSI-0x23422342:GERAN-A-0:LU){RAN_CONN_S_NEW}: Updated ID
-DREF VLR subscr TMSI-0x23422342 usage decreases to: 1
+DREF VLR subscr TMSI-0x23422342 - _lu_fsm_associate_vsub: now used by 1 (conn)
 DVLR vlr_lu_fsm(TMSI-0x23422342:GERAN-A-0:LU){VLR_ULA_S_IDLE}: vlr_loc_upd_want_imsi()
 DVLR vlr_lu_fsm(TMSI-0x23422342:GERAN-A-0:LU){VLR_ULA_S_IDLE}: state_chg to VLR_ULA_S_WAIT_IMSI
 DMSC msc_tx 3 bytes to TMSI-0x23422342 via GERAN-A
@@ -412,13 +414,13 @@
 - 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:TMSI-0x23422342 usage increases to: 2
+DREF VLR subscr IMSI-901700000004620:TMSI-0x23422342 + vlr_gsupc_read_cb: now used by 2 (conn,vlr_gsupc_read_cb)
 DVLR IMSI:901700000004620 has MSISDN:46071
-DVLR SUBSCR(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342) VLR: update for IMSI=901700000004620 (MSISDN=46071, used=2)
+DVLR SUBSCR(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342) VLR: update for IMSI=901700000004620 (MSISDN=46071)
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){RAN_CONN_S_AUTH_CIPH}: Updated ID
 DVLR GSUP tx: 12010809710000004026f0
 GSUP --> HLR: OSMO_GSUP_MSGT_INSERT_DATA_RESULT: 12010809710000004026f0
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 usage decreases to: 1
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 - vlr_gsupc_read_cb: now used by 1 (conn)
 <-- GSUP rx OSMO_GSUP_MSGT_INSERT_DATA_REQUEST: vlr_gsupc_read_cb() returns 0
   lu_result_sent == 0
 - having received subscriber data does not mean acceptance
@@ -436,7 +438,7 @@
 - HLR also sends GSUP _UPDATE_LOCATION_RESULT
 <-- GSUP rx OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: 06010809710000004026f0
 DVLR GSUP rx 11: 06010809710000004026f0
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 usage increases to: 2
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 + vlr_gsupc_read_cb: now used by 2 (conn,vlr_gsupc_read_cb)
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){VLR_ULA_S_WAIT_HLR_UPD}: Received Event VLR_ULA_E_HLR_LU_RES
 DVLR upd_hlr_vlr_fsm(TMSI-0x23422342:GERAN-A-0:LU){UPD_HLR_VLR_S_WAIT_FOR_DATA}: Received Event UPD_HLR_VLR_E_UPD_LOC_ACK
 DVLR upd_hlr_vlr_fsm(TMSI-0x23422342:GERAN-A-0:LU){UPD_HLR_VLR_S_WAIT_FOR_DATA}: state_chg to UPD_HLR_VLR_S_DONE
@@ -450,7 +452,7 @@
 DVLR lu_compl_vlr_fsm(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){LU_COMPL_VLR_S_INIT}: state_chg to LU_COMPL_VLR_S_WAIT_SUB_PRES
 DVLR lu_compl_vlr_fsm(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){LU_COMPL_VLR_S_WAIT_SUB_PRES}: Received Event LU_COMPL_VLR_E_SUB_PRES_COMPL
 - sending LU Accept for IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 usage increases to: 3
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 + attached: now used by 3 (conn,vlr_gsupc_read_cb,attached)
 DVLR lu_compl_vlr_fsm(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){LU_COMPL_VLR_S_WAIT_SUB_PRES}: state_chg to LU_COMPL_VLR_S_DONE
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_LU_COMPL_SUCCESS
 DVLR lu_compl_vlr_fsm(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){LU_COMPL_VLR_S_DONE}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: upd_hlr_vlr_fsm(TMSI-0x23422342:GERAN-A-0:LU))
@@ -462,11 +464,11 @@
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){RAN_CONN_S_ACCEPTED}: Received Event RAN_CONN_E_UNUSED
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){RAN_CONN_S_ACCEPTED}: state_chg to RAN_CONN_S_RELEASING
 DREF IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342: MSC conn use + release == 1 (0x100: release)
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 usage increases to: 4
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 usage decreases to: 3
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 + vlr_subscr_cancel_attach_fsm: now used by 4 (conn,vlr_gsupc_read_cb,attached,vlr_subscr_cancel_attach_fsm)
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 - vlr_subscr_cancel_attach_fsm: now used by 3 (conn,vlr_gsupc_read_cb,attached)
 - BSSAP Clear --GERAN-A--> MS
 DVLR upd_hlr_vlr_fsm(TMSI-0x23422342:GERAN-A-0:LU){UPD_HLR_VLR_S_DONE}: Deallocated, including all deferred deallocations
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 usage decreases to: 2
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 - vlr_gsupc_read_cb: now used by 2 (conn,attached)
 <-- GSUP rx OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: vlr_gsupc_read_cb() returns 0
   bssap_clear_sent == 1
 - LU was successful, and the conn has already been closed
@@ -481,7 +483,7 @@
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){VLR_ULA_S_DONE}: Deferring: will deallocate with RAN_conn(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU)
 DRLL IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342: Freeing RAN connection
-DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 usage decreases to: 1
+DREF VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342 - conn: now used by 1 (attached)
 DMM RAN_conn(IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342:GERAN-A-0:LU){RAN_CONN_S_RELEASED}: Deallocated, including all deferred deallocations
   llist_count(&net->ran_conns) == 0
 DREF freeing VLR subscr IMSI-901700000004620:MSISDN-46071:TMSI-0x23422342