I'm running into this error with pantsd rather frequently:

Exception in thread FSEventServiceThread:                                                                                                                                                                            
Traceback (most recent call last):                                                                        
  File "/home/gregs/code/pants/build-support/virtualenvs/Linux/pants_dev_deps.py38.venv/lib/python3.8/site-packages/pywatchman/__init__.py", line 339, in readBytes
    buf = [self.sock.recv(size)]                                                                          
socket.timeout: timed out