Selenium hanging with xvfb - selenium

Question

I am attempting to run automated selenium headless tests, and I'm running into the issue where the tests hang for some inexplicable reason. The full snippet is on pastebin, but the relevant portion of the code is reproduced below:
# stress testing
i = 0
while True:
print i
d = webdriver.Remote(
service.service_url,
desired_capabilities=DesiredCapabilities.CHROME
)
print i, "started driver"
d.get("http://www.facebook.com")
print i, "got fb"
d.quit()
print i, "quit"
i += 1
Sample output is
0
0 started driver
0 got fb
0 quit
...
11 <hang>
Which indicates that webdriver.Remote is refusing to properly initiate the driver. This also occurs when the driver instance is constructed directly with webdriver.Chrome (instead of running the ChromeDriver as a service).
After sending SIGINT to the hanging program, I get a stacktrace (pastebin) indicating a blocking socket read somewhere in the constructor.
ChromeDriver's log (dropcanvas) doesn't seem to indicate anything amiss, and I'm quite puzzled as to what is happening here.
Similar questions have been asked previously, the most relevant being Selenium Chromedriver Hangs?; however, I cannot reproduce the accepted solution (starting Xvfb anew for each instantiation of webdriver...). Here, the equivalent would be calling Xvfb.start immediately preceding d = webdriver.Remote... and calling Xvfb.stop at the end of the loop; I have tried this to no success.
Any help would be greatly appreciated.
Edit: As indicated by the stacktrace, webdriver.Remote was hanging on some socket read function; I traced the request to be
POST 'http://127.0.0.1:<chromedriver_port>/session'
with body
'{"desiredCapabilities": {"platform": "ANY", "browserName": "chrome", "version": "", "javascriptEnabled": true}}'
So it seems like ChromeDriver isn't responding for some reason. Will continue debugging.