Qnap, Docker and Bluetooth USB dongle error

Hi,

I upgrade my previous version of Home Assistant (docker image for QNAP) and now, i have error at startup for bluetooth.

Error setting up platform legacy
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/bluetooth/bluez.py", line 31, in discover_devices
    lookup_class=lookup_class, device_id=device_id)
_bluetooth.error: (4, 'Interrupted system call')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/device_tracker/setup.py", line 77, in async_setup_legacy
    discovery_info,
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/src/homeassistant/homeassistant/components/bluetooth_tracker/device_tracker.py", line 97, in setup_scanner
    for dev in discover_devices():
  File "/usr/src/homeassistant/homeassistant/components/bluetooth_tracker/device_tracker.py", line 72, in discover_devices
    device_id=device_id,
  File "/usr/local/lib/python3.7/site-packages/bluetooth/bluez.py", line 34, in discover_devices
    raise BluetoothError ("error communicating with local "
bluetooth.btcommon.BluetoothError: error communicating with local bluetooth adapter

This is my setup:

With a previous version, know_devices.yaml contains my Bluetooth devices (connection with bluetooth OK)

I do some tests:

*** Host see USB bluetooth and work**

 hciconfig dev
hci0:   Type: USB
        BD Address: 00:19:86:00:10:BC ACL MTU: 1017:8 SCO MTU: 64:0
        UP RUNNING PSCAN
        RX bytes:7524 acl:0 sco:0 events:347 errors:0
        TX bytes:572 acl:0 sco:0 commands:52 errors:0
 hcitool scan
Scanning ...
        50:A0:09:B0:68:AA       MIBOX3
        3C:BD:3E:0F:77:6A       小米互联网音箱(580151104

*** Home Assistant see USB Bluetooth and work**

hciconfig dev                                                                                                                                                                                                                                                                                                                                                 
hci0:   Type: Primary  Bus: USB                                                                                                                                                                                                                                                                                                                                         
        BD Address: 00:19:86:00:10:BC  ACL MTU: 1017:8  SCO MTU: 64:0                                                                                                                                                                                                                                                                                                   
        UP RUNNING PSCAN                                                                                                                                                                                                                                                                                                                                                
        RX bytes:7524 acl:0 sco:0 events:347 errors:0                                                                                                                                                                                                                                                                                                                   
        TX bytes:572 acl:0 sco:0 commands:52 errors:0
hcitool scan                                                                                                                                                                                                                                                                                                                                                  
Scanning ...                                                                                                                                                                                                                                                                                                                                                            
        3C:BD:3E:0F:77:6A       小米互联网音箱(580151104                                                                                                                                                                                                                                                                                                                       
        50:A0:09:B0:68:AA       MIBOX3

Can you help me ?

Have you ever figured it out? I am having the exact same problem but running on a raspberry pi 4 in docker. Also the bluetooth scan works also tried it in the homeassistant container.

what also want to know if you got it to work and how? regards