core: 0.117 - RFXtrx serial error

The problem

RFXtrx stopped working since upgrading to HA 0.117.
Error message from the log

2020-10-31 17:48:08 ERROR (Thread-8) [root] Uncaught thread exception
Traceback (most recent call last):
  File "/usr/local/share/hass/lib/python3.8/site-packages/serial/serialposix.py", line 500, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/share/hass/lib/python3.8/site-packages/RFXtrx/__init__.py", line 862, in _connect
    self._status = self.send_get_status()
  File "/usr/local/share/hass/lib/python3.8/site-packages/RFXtrx/__init__.py", line 928, in send_get_status
    return self.transport.receive_blocking()
  File "/usr/local/share/hass/lib/python3.8/site-packages/RFXtrx/__init__.py", line 684, in receive_blocking
    data = self.serial.read(pkt[0])
  File "/usr/local/share/hass/lib/python3.8/site-packages/serial/serialposix.py", line 509, in read
    raise SerialException('read failed: {}'.format(e))
serial.serialutil.SerialException: read failed: device reports readiness to read but returned no data (device disconnected or multiple access on port?)

Downgrading to 0.116.x fixes the issue

Environment

• Home Assistant Core release with the issue: 0.117.1
• Last working Home Assistant Core release (if known): 0.116.4
• Operating environment (OS/Container/Supervised/Core): FreeBSD 12.2-RELEASE
• Integration causing this issue: RFXtrx
• Link to integration documentation on our website: https://www.home-assistant.io/integrations/rfxtrx/

Problem-relevant configuration.yaml

Note this is the entry as it was for 0.116.4. I’ve also tried to remove it for 0.117.1, did not fix the issue

rfxtrx:
  device: /dev/rfx
  devices:
    0a520d52fd0100d8430189: # Outside Alecto sensor
    115a02018bf2010000092e00000000000089: # Electricity sensor
    0b11003b020A100801010f60: # Lighting Terrace Garland
    0b11003b020A100901010f60: # Lighting Entrance Side
    0b11003b020A100701010f60: # Lighting Entrance Main door
    0b11003b020A101001010f60: # Lighting Terrace Lamps    
    0b11003b0101023202010f60: # Extractor Bathroom
    0b11003b0104091116010f60: # Lighting Sleigh
    0b11003b000C050005010f60: # Lighting Entrance Parking

Traceback/Error logs

See above. Also captured IO to RFXtrx device below. /dev/rfx is a symlink to /dev/cuaU0

openat(AT_FDCWD,"/dev/rfx",O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC,00) = 41 (0x29)
ioctl(41,TIOCGETA,0x7fffdf7f9c40)                = 0 (0x0)
ioctl(41,TIOCGETA,0x7fffdf7f9c40)                = 0 (0x0)
ioctl(41,TIOCSETA,0x7fffdf7f9c40)                = 0 (0x0)
ioctl(41,TIOCMBIS,0x7fffdf7f9a30)                = 0 (0x0)
ioctl(41,TIOCMBIS,0x7fffdf7f9a30)                = 0 (0x0)
ioctl(41,TIOCFLUSH,0x7fffdf7f9dcc)               = 0 (0x0)
write(41,"\r\0\0\0\0\0\0\0\0\0\0\0\0\0",14)      = 14 (0xe)
ioctl(41,TIOCFLUSH,0x7fffd8fe0e9c)               = 0 (0x0)
write(41,"\r\0\0\^A\^B\0\0\0\0\0\0\0\0\0",14)    = 14 (0xe)
read(41,0x80643e3b0,1)                           = 0 (0x0)

Additional information

Downgrading to 0.116.4 fixes the issue. Device permissions are correct. May be related to pyRFXtrx version change (0.116 uses pyRFXtrx==0.25, 0.117 uses pyRFXtrx==0.26) Tested pyRFXtrx with the included test program pyRFXtrx/examples/receive.py , both versions 0.25 and 0.26 work fine, able to see rfx device and messages from sensors. Also tried to remove and add again the RFXtrx integration, no improvement.