A few other things I don't understand:

* Why does setting OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES only seem to work when it's set in the shell before the parent process executes?  AFAICT, it does *not* work if you set that in os.environ in the parent process before the os.fork().

* Why does it only crash on the first invocation of our app?  Does getproxies() cache the results somehow?  There's too much internal application code in the way to know if we're doing something that prevents getproxies() from getting called in subsequent calls.

* I can't seem to produce a smaller test case.