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From:   John Klug <John.Klug@multitech.com>
To:     "linux-bluetooth@vger.kernel.org Bluez Kernel" 
        <linux-bluetooth@vger.kernel.org>
Subject: [BUG] Use of gatttool causes scan to stop (permanently?)
Thread-Topic: [BUG] Use of gatttool causes scan to stop (permanently?)
Thread-Index: AQHYhaAmP1kRJIC1nEyd0lQ+AaX93w==
Date:   Tue, 21 Jun 2022 18:58:52 +0000
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I am using 5.4.199 currently with bluez 5.64 on an arm 32.  The same proble=
m occurs in earlier versions and kernels.=0A=
=0A=
In bluetoothctl after the issue occurs the "show" command always says:=0A=
=A0 =A0 Discovering: yes=0A=
=0A=
And no scan data follows, even though we have many devices.=0A=
=0A=
I have tried turning on duplicate data with bluetoothctl.=0A=
=0A=
I see (manually typed in):=0A=
=A0 [bluetooth]# scan on=0A=
=A0 SetDiscoveryFilter success=0A=
=A0 [bluetooth]# scan off=0A=
=A0 Failed to stop discovery: org.bluez.Error.InProgress=0A=
=A0 [bluetooth]# scan on=0A=
=A0 Failed to start discovery: org.bluez.Error.InProgress=0A=
=A0 [bluetooth]# scan off=0A=
=A0 Failed to stop discovery: org.bluez.Error.InProgress=0A=
=A0 [bluetooth]# scan on=0A=
=A0 Failed to start discovery: org.bluez.Error.InProgress=0A=
=A0 [bluetooth]# scan off=0A=
=A0 Failed to stop discovery: org.bluez.Error.InProgress=0A=
=A0 Failed to start discovery: org.freedesktop.DBus.Error.NoReply=0A=
=0A=
gatttool can still connect and retrieve data.=0A=
=0A=
btmon shows no activty except from gatttool, and none from scan=0A=
=0A=
Here is a snippet of debug from bluetoothd:=0A=
=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
agent.c:agent_disconnect() Agent :1.1113 disconnected=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
agent.c:remove_default_agent() Default agent cleared=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
adapter.c:set_mode() sending set mode command for index 0=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
agent.c:agent_destroy() agent :1.1113=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
agent.c:agent_unref() 0x13285c8: ref=3D3D0=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
adapter.c:discovery_disconnect() owner :1.1113=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
adapter.c:discovery_remove() owner :1.1113=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
adapter.c:discovery_free() 0x1321050=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
adapter.c:update_discovery_filter()=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
adapter.c:discovery_filter_to_mgmt_cp()=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
adapter.c:trigger_start_discovery()=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
adapter.c:cancel_passive_scanning()=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
adapter.c:start_discovery_timeout()=0A=
=A0 =A0 Jun 21 13:33:30 ecc8 daemon.debug bluetoothd[32170]: ../bluez-5.64/=
src/=3D=0A=
adapter.c:start_discovery_timeout() adapter->current_discovery_filter=0A=
=0A=
Do you have any suggestions for further research into this problem?=0A=
=0A=
John Klug=0A=