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  1. Qt
  2. QTBUG-111116

QT BLE scanner example causes high cpu usage

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Details

    • Windows
    • 21
    • 4eac30923 (dev), fd9c9a6ea (6.5), c54f4e26a (tqtc/lts-6.2)
    • Foundation Sprint 76, Foundation Sprint 77, Foundation Sprint 78

    Description

      Using latest build of Windows 10 + Qt 6.4.2. Built and ran Qt Bluetooth Low Energy Scanner example. It's causing 100% cpu usage in process "Service Host: Device Association Service", makes the computer virtually unusable. The scan takes several minutes to complete and only addresses of BLE devices are displayed - not their names?

      OTOH, I tried sample Windows Universal Ble scanner. It doesn't result in high cpu usage, scan completes quickly and it also displays name of the ble peripheral.

      Considering QBluetooth in 6.4.2 uses winrt backend, such huge difference implies possible implementation bug in Qt?

      Link to Windows Official Ble Sample app: https://learn.microsoft.com/en-us/samples/microsoft/windows-universal-samples/bluetoothle/ 

      Note: Following errors are output when Qt Ble sample is run in debug mode.
       

      onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(1) tid(3c4c0) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(2) tid(3c4c0) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(1) tid(3c4c0) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(3) tid(39234) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(4) tid(39234) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(2) tid(39234) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(5) tid(3abdc) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(6) tid(3abdc) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(3) tid(3abdc) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(7) tid(3a834) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(8) tid(3a834) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(4) tid(3a834) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(9) tid(3b8ac) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(10) tid(3b8ac) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(5) tid(3b8ac) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(11) tid(39c60) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(12) tid(39c60) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(6) tid(39c60) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(13) tid(3830c) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(14) tid(3830c) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(7) tid(3830c) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(15) tid(393bc) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(16) tid(393bc) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(8) tid(393bc) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(17) tid(30940) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(18) tid(30940) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(9) tid(30940) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(19) tid(35a8c) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(20) tid(35a8c) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(10) tid(35a8c) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(21) tid(3ca50) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(22) tid(3ca50) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(11) tid(3ca50) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(297)\Windows.Devices.Bluetooth.dll!00007FF854E20C10: (caller: 00007FF854E20698) ReturnHr(23) tid(3d8ac) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\common\devquerydevpropprovider.cpp(131)\Windows.Devices.Bluetooth.dll!00007FF854E206EC: (caller: 00007FF854E35B5A) ReturnHr(24) tid(3d8ac) 80070490 Element not found.
onecoreuap\drivers\wdm\bluetooth\user\winrt\device\bluetoothledevice.cpp(1597)\Windows.Devices.Bluetooth.dll!00007FF854E35B72: (caller: 00007FF854E30BC0) LogHr(12) tid(3d8ac) 80070490 Element not found.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.
Exception thrown at 0x00007FF87DEFCD29 (KernelBase.dll) in lowenergyscanner.exe: WinRT originate error - 0x80010108 : 'The object invoked has disconnected from its clients.'.

       

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        Issue Links

          resulted in

          Suggestion - Public suggestions QTBUG-112382 Manufacturer ID and Service Uuid Filtering support in QBluetoothServiceDiscoveryAgent

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported

          Suggestion - Public suggestions QTBUG-112771 [Bluetooth] Conditionally disable detailed service discovery during device discovery on Windows

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Reported
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              ivan.solovev Ivan Solovev
              taytoo Mike Flanigan
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
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                Updated:
                Resolved:

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