core: Bluetooth tracker crash wlan

Home Assistant release with the issue: 0.77.3 (also 0.77.2) hassio version 1.3.1

Last working Home Assistant release (if known): N.A.

Operating environment (Hass.io/Docker/Windows/etc.): hassio version 1.3.1, Raspberry pi 3 connected via wlan.

Telldus and a bunch of switches. Apple tv and remote. Pioneer VSX 923. Mqtt broker, Script in router publish message to MQTT broker when a new wifi node connect mqtt subscribes on these messages.

Component/platform: https://www.home-assistant.io/components/device_tracker.bluetooth_tracker/

Description of problem: The bluetooth_tracker seems to break the wlan0 (link not ready). The system becomes rather un responsive probably because the wlan0 goes up and down, e.g. log entry IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready brcmfmac: powermanagement disabled IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready … IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

I’m unable to provide the complete log from the console that is connected to the Raspberry pi 3. The console log can be added if I get instructions how to capture it to a file.

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

device_tracker:
  - platform: nmap_tracker
    hosts:
     - 192.168.10.24
     - 192.168.10.45
    exclude:
     - 192.168.10.43
     - 192.168.10.44
    interval_seconds: 20
    consider_home: 300
    track_new_devices: true
  - platform: mqtt_json
    devices:
          android1examplecom: 'location/xx'
          android2examplecom: 'location/yy'
  - platform: bluetooth_tracker
    interval_seconds: 10

Traceback (if applicable):

N.A.

Additional information: There is no warning in the documentaion regarding this compared to the bluetooth LTE tracker documentation, see https://www.home-assistant.io/components/device_tracker.bluetooth_le_tracker/