Core: bluetooth_tracker stops working after some time (HA 0.96.x)

[bieniu]

Home Assistant release with the issue:
0.96.1 and 0.96.2

Last working Home Assistant release (if known):
0.95.4

Operating environment (Hass.io/Docker/Windows/etc.):
RPi3, Raspbain Stretch, Python 3.7.2, venv

Component/platform:
device_tracker/bluetooth_tracker

Description of problem:
After update HA to 0.96.x bluetooth_tracker works only some time after restart. Sometimes few minutes, sometimes few hours. Debug log shows that the component scans for the devices every minute and stops suddenly without any error.

2019-07-19 23:37:45 DEBUG (SyncWorker_16) [homeassistant.components.bluetooth_tracker.device_tracker] Bluetooth devices discovered = 2
2019-07-19 23:37:45 DEBUG (SyncWorker_16) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:83:E0
2019-07-19 23:37:50 DEBUG (SyncWorker_16) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:D8:0E
2019-07-19 23:37:55 DEBUG (SyncWorker_16) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:F6:3B
2019-07-19 23:38:00 DEBUG (SyncWorker_16) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:AC:4C
2019-07-19 23:38:05 DEBUG (SyncWorker_16) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:4A:4C
2019-07-19 23:38:11 DEBUG (SyncWorker_16) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:AB:2D
2019-07-19 23:38:59 DEBUG (SyncWorker_7) [homeassistant.components.bluetooth_tracker.device_tracker] Bluetooth devices discovered = 0
2019-07-19 23:38:59 DEBUG (SyncWorker_7) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:83:E0
2019-07-19 23:39:04 DEBUG (SyncWorker_7) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:D8:0E
2019-07-19 23:39:07 DEBUG (SyncWorker_7) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:F6:3B
2019-07-19 23:39:12 DEBUG (SyncWorker_7) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:AC:4C
2019-07-19 23:39:17 DEBUG (SyncWorker_7) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:4A:4C
2019-07-19 23:39:22 DEBUG (SyncWorker_7) [homeassistant.components.bluetooth_tracker.device_tracker] Scanning xx:xx:xx:xx:AB:2D

Sometimes an error is displayed during the scan:

2019-07-19 16:19:04 ERROR (SyncWorker_14) [homeassistant.components.bluetooth_tracker.device_tracker] Error looking up Bluetooth device
Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.7/site-packages/bluetooth/bluez.py", line 31, in discover_devices
    lookup_class=lookup_class, device_id=device_id)
_bluetooth.error: (110, 'Connection timed out')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.7/site-packages/homeassistant/components/bluetooth_tracker/device_tracker.py", line 102, in update_bluetooth_once
    for dev in discover_devices():
  File "/srv/homeassistant/lib/python3.7/site-packages/homeassistant/components/bluetooth_tracker/device_tracker.py", line 57, in discover_devices
    lookup_class=False, device_id=device_id)
  File "/srv/homeassistant/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

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):

device_tracker:
  - platform: bluetooth_tracker

[bieniu]

When the bluetooth_tracker stops working, starting the pairing of the BT device from the Raspbian desktop causes the scans in HA work again for some time.

[serapol]

Yes, I confirm that. I have the same problem, but in my case, Bluetooth doesn't work at all. I always get this error.
My configuration:
RPI3, Raspbian, Docker, HA 0.96.2

[Wampukas]

I can confirm the issue. I have rolled back to 0.95.4 till this will be fixed.

[Wampukas]

Will anyone take a look at this issue ?

[bieniu]

Do you have this error in dmesg | grep -i blue:

Bluetooth: hci0: Frame reassembly failed (-84)

If yes this is a kernel related issue https://github.com/raspberrypi/firmware/issues/1150

My dmesg is full of this.

[bieniu]

Issue is kernel related. After downgrade kernel to version 4.14.98, the bluetooth_tracker works without any problems. All kernels 4.19.x have this issue. Fix will be in version 4.19.58 but for now this is not stable kernel.