Gunicorn crashing on closing file descriptors.

gistfile1.txt

Traceback (most recent call last):
  File "test-env/bin/gunicorn", line 8, in <module>
    load_entry_point('gunicorn==0.16.1', 'console_scripts', 'gunicorn')()
  File "/Users/graham/Work/python_agent-1.10.X/test-env/lib/python2.6/site-packages/gunicorn/app/wsgiapp.py", line 32, in run
    WSGIApplication("%prog [OPTIONS] APP_MODULE").run()
  File "/Users/graham/Work/python_agent-1.10.X/test-env/lib/python2.6/site-packages/gunicorn/app/base.py", line 127, in run
    Arbiter(self).run()
  File "/Users/graham/Work/python_agent-1.10.X/test-env/lib/python2.6/site-packages/gunicorn/arbiter.py", line 162, in run
    self.start()
  File "/Users/graham/Work/python_agent-1.10.X/test-env/lib/python2.6/site-packages/gunicorn/arbiter.py", line 122, in start
    self.init_signals()
  File "/Users/graham/Work/python_agent-1.10.X/test-env/lib/python2.6/site-packages/gunicorn/arbiter.py", line 149, in init_signals
    self.log.close_on_exec()
  File "/Users/graham/Work/python_agent-1.10.X/test-env/lib/python2.6/site-packages/gunicorn/glogging.py", line 275, in close_on_exec
    util.close_on_exec(handler.stream.fileno())
  File "/Users/graham/Work/python_agent-1.10.X/test-env/lib/python2.6/site-packages/gunicorn/util.py", line 201, in close_on_exec
    flags = fcntl.fcntl(fd, fcntl.F_GETFD)
IOError: [Errno 9] Bad file descriptor
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 1473, in shutdown
    h.close()
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 800, in close
    self.stream.close()
IOError: [Errno 9] Bad file descriptor
Error in sys.exitfunc:
Traceback (most recent call last):
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 1473, in shutdown
    h.close()
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 800, in close
    self.stream.close()
IOError: [Errno 9] Bad file descriptor