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From:   John Klug <John.Klug@multitech.com>
To:     Linux-Bluetooth MailingList <linux-bluetooth@vger.kernel.org>
Subject: scan stops after multiple BLE connect/disconnect
Thread-Topic: scan stops after multiple BLE connect/disconnect
Thread-Index: AQHYiCKQV61I2nbW5kmBvaiLVBeB9g==
Date:   Fri, 24 Jun 2022 23:49:29 +0000
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Software versions:=0A=
Kernel v5.4.199 with patch "Bluetooth: hci_event: Ignore multiple conn comp=
lete events" from Soenke Huster.=0A=
Bluez 5.64=0A=
=0A=
After running multiple concurrent connect/info/disconnect/remove cycles whi=
le scan is turned on (all done with bluetoothctl), scan eventually stops wo=
rking, and it is no longer possible to turn scan on or off. The show comman=
d indicates that the device is still scanning, and the state cannot be chan=
ged.=0A=
=0A=
The scan was turned on with "scan le" in bluetoothctl.=A0 bluetoothctl was =
also used to connect to the endpoint devices.=0A=
=0A=
In the bluetoothd log, there are messages like this:=0A=
=A0   update_discovery_filter() filters were equal, deciding to not restart=
 the scan. =A0 =0A=
This message does not occur when the test is running normally.=0A=
=0A=
Here is the tail end of btmon which halts after the problem occurs:=0A=
=0A=
@ MGMT Command: S.. (0x0024) plen 1 =A0{0x0001} [hci0] 2022-06-24 18:17:12.=
624762=0A=
=A0 =A0 =A0 =A0 Address type: 0x06=0A=
=A0 =A0 =A0 =A0 =A0 LE Public=0A=
=A0 =A0 =A0 =A0 =A0 LE Random=0A=
< HCI Command:.. (0x08|0x000c) plen 2 =A0#24633 [hci0] 2022-06-24 18:17:12.=
627487=0A=
=A0 =A0 =A0 =A0 Scanning: Disabled (0x00)=0A=
=A0 =A0 =A0 =A0 Filter duplicates: Disabled (0x00)=0A=
> HCI Event: Command... (0x0e) plen 4 =A0#24634 [hci0] 2022-06-24 18:17:12.=
629378=0A=
=A0 =A0 =A0 LE Set Scan Enable (0x08|0x000c) ncmd 1=0A=
=A0 =A0 =A0 =A0 Status: Success (0x00)=0A=
@ MGMT Event: Dis.. (0x0013) plen 2 =A0{0x0001} [hci0] 2022-06-24 18:17:12.=
629839=0A=
=A0 =A0 =A0 =A0 Address type: 0x06=0A=
=A0 =A0 =A0 =A0 =A0 LE Public=0A=
=A0 =A0 =A0 =A0 =A0 LE Random=0A=
=A0 =A0 =A0 =A0 Discovery: Disabled (0x00)=0A=
< HCI Command:.. (0x08|0x0005) plen 6 =A0#24635 [hci0] 2022-06-24 18:17:12.=
630071=0A=
=A0 =A0 =A0 =A0 Address: C8:8E:7B:1E:9A:58 (Static)=0A=
> HCI Event: LE Meta.. (0x3e) plen 43 =A0#24636 [hci0] 2022-06-24 18:17:12.=
630361=0A=
=A0 =A0 =A0 LE Advertising Report (0x02)=0A=
=A0 =A0 =A0 =A0 Num reports: 1=0A=
=A0 =A0 =A0 =A0 Event type: Non connectable undirected - ADV_NONCONN_IND (0=
x03)=0A=
=A0 =A0 =A0 =A0 Address type: Random (0x01)=0A=
=A0 =A0 =A0 =A0 Address: 34:42:82:95:CB:3D (Non-Resolvable)=0A=
=A0 =A0 =A0 =A0 Data length: 31=0A=
=A0 =A0 =A0 =A0 Company: Microsoft (6)=0A=
=A0 =A0 =A0 =A0 =A0 Data: 01092002f69644aca805d759f0b1220b44947a78f52828a5b=
a9387=0A=
=A0 =A0 =A0 =A0 RSSI: -58 dBm (0xc6)=0A=
> HCI Event: Command... (0x0e) plen 4 =A0#24637 [hci0] 2022-06-24 18:17:12.=
631360=0A=
=A0 =A0 =A0 LE Set Random Address (0x08|0x0005) ncmd 1=0A=
=A0 =A0 =A0 =A0 Status: Success (0x00)=0A=
< HCI Command:.. (0x08|0x000b) plen 7 =A0#24638 [hci0] 2022-06-24 18:17:12.=
631790=0A=
=A0 =A0 =A0 =A0 Type: Passive (0x00)=0A=
=A0 =A0 =A0 =A0 Interval: 60.000 msec (0x0060)=0A=
=A0 =A0 =A0 =A0 Window: 30.000 msec (0x0030)=0A=
=A0 =A0 =A0 =A0 Own address type: Random (0x01)=0A=
=A0 =A0 =A0 =A0 Filter policy: Ignore not in accept list (0x01)=0A=
> HCI Event: Command... (0x0e) plen 4 =A0#24639 [hci0] 2022-06-24 18:17:12.=
633365=0A=
=A0 =A0 =A0 LE Set Scan Parameters (0x08|0x000b) ncmd 1=0A=
=A0 =A0 =A0 =A0 Status: Success (0x00)=0A=
< HCI Command:.. (0x08|0x000c) plen 2 =A0#24640 [hci0] 2022-06-24 18:17:12.=
633787=0A=
=A0 =A0 =A0 =A0 Scanning: Enabled (0x01)=0A=
=A0 =A0 =A0 =A0 Filter duplicates: Enabled (0x01)=0A=
> HCI Event: Command... (0x0e) plen 4 =A0#24641 [hci0] 2022-06-24 18:17:12.=
635411=0A=
=A0 =A0 =A0 LE Set Scan Enable (0x08|0x000c) ncmd 1=0A=
=A0 =A0 =A0 =A0 Status: Success (0x00)=0A=
=0A=
Here is the bluetoothd debug output near the time when the error first occu=
rs:=0A=
=0A=
Jun 24 18:17:36 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:device_remove() Removing device /org/bluez/hci0/dev_C8_7B_FB_0E_8C_BC =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=0A=
Jun 24 18:17:36 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:btd_device_unref() Freeing device /org/bluez/hci0/dev_C8_7B_FB_0E_8C_B=
C =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=0A=
Jun 24 18:17:36 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:device_free() 0xc09df0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=0A=
Jun 24 18:17:36 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:start_discovery() sender :1.9921 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A=
Jun 24 18:17:36 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:update_discovery_filter() =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A=
Jun 24 18:17:36 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:discovery_filter_to_mgmt_cp() =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A=
Jun 24 18:17:36 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:update_discovery_filter() filters were equal, deciding to not restart=
 the scan. =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A=
Jun 24 18:17:39 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:device_remove() Removing device /org/bluez/hci0/dev_C6_F9_1C_2E_EA_E1 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=0A=
Jun 24 18:17:39 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:btd_device_unref() Freeing device /org/bluez/hci0/dev_C6_F9_1C_2E_EA_E=
1 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=0A=
Jun 24 18:17:39 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:device_free() 0xc0aed8 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=0A=
Jun 24 18:17:39 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:device_remove() Removing device /org/bluez/hci0/dev_C9_47_35_4D_C3_EC =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=0A=
Jun 24 18:17:39 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:btd_device_unref() Freeing device /org/bluez/hci0/dev_C9_47_35_4D_C3_E=
C =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=0A=
Jun 24 18:17:39 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:device_free() 0xc1a218 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=0A=
Jun 24 18:17:42 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:device_remove() Removing device /org/bluez/hci0/dev_D3_87_9A_19_E7_BE =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=0A=
Jun 24 18:17:42 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:btd_device_unref() Freeing device /org/bluez/hci0/dev_D3_87_9A_19_E7_B=
E =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=0A=
Jun 24 18:17:42 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/devi=
ce.c:device_free() 0xc5ae88 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=0A=
Jun 24 18:17:46 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:discovery_disconnect() owner :1.9921 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A=
Jun 24 18:17:46 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:discovery_remove() owner :1.9921 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=A0 =0A=
Jun 24 18:17:46 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:discovery_free() 0xc1b130 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=A0 =0A=
Jun 24 18:17:46 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:update_discovery_filter() =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A=
Jun 24 18:17:46 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:discovery_filter_to_mgmt_cp() =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=A0 =0A=
Jun 24 18:17:46 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:update_discovery_filter() filters were equal, deciding to not restart=
 the scan. =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A=
Jun 24 18:18:10 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:start_discovery() sender :1.9922 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A=
Jun 24 18:18:10 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:update_discovery_filter() =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A=
Jun 24 18:18:10 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:discovery_filter_to_mgmt_cp() =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A=
Jun 24 18:18:10 ecc8 daemon.debug bluetoothd[28264]: ../bluez-5.64/src/adap=
ter.c:update_discovery_filter() filters were equal, deciding to not restart=
 the scan. =A0 =0A=
=0A=
Any suggestions for further analysis would be appreciated.=0A=
=0A=
John Klug=0A=