uWSGI error on shutting down with master, multiple processes and reload mercy.

gistfile1.txt

$ uwsgi --ini uwsgi.ini -M -p 2 --reload-mercy 3
[uWSGI] getting INI configuration from uwsgi.ini
*** Starting uWSGI 1.4.1 (64bit) on [Fri Nov 23 14:43:05 2012] ***
compiled with version: 4.2.1 (Apple Inc. build 5666) (dot 3) on 22 November 2012 16:19:23
os: Darwin-10.8.0 Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
nodename: Grumpys-MacBook-Pro-15.local
machine: i386
clock source: unix
detected number of CPU cores: 4
current working directory: /Library/WebServer/Sites/hello-1/htdocs
detected binary path: /Users/graham/Python/uwsgi-testing/bin/uwsgi
your processes number limit is 266
your memory page size is 4096 bytes
detected max file descriptor number: 256
lock engine: OSX spinlocks
uwsgi socket 0 bound to UNIX address /tmp/uwsgi.sock fd 3
Python version: 2.6.1 (r261:67515, Jun 24 2010, 21:47:49)  [GCC 4.2.1 (Apple Inc. build 5646)]
Set PythonHome to /Users/graham/Python/uwsgi-testing
Python main interpreter initialized at 0x1003096a0
python threads support enabled
your server socket listen backlog is limited to 100 connections
mapped 217152 bytes (212 KB) for 2 cores
*** Operational MODE: preforking ***
PID 2642
SYS.PREFIX /Users/graham/Python/uwsgi-testing
SYS.PATH ['.', '', '/Users/graham/Python/uwsgi-testing/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg', '/Users/graham/Python/uwsgi-testing/lib/python2.6/site-packages/pip-1.1-py2.6.egg', '/Users/graham/Python/uwsgi-testing/lib/python26.zip', '/Users/graham/Python/uwsgi-testing/lib/python2.6', '/Users/graham/Python/uwsgi-testing/lib/python2.6/plat-darwin', '/Users/graham/Python/uwsgi-testing/lib/python2.6/plat-mac', '/Users/graham/Python/uwsgi-testing/lib/python2.6/plat-mac/lib-scriptpackages', '/Users/graham/Python/uwsgi-testing/Extras/lib/python', '/Users/graham/Python/uwsgi-testing/lib/python2.6/lib-tk', '/Users/graham/Python/uwsgi-testing/lib/python2.6/lib-old', '/Users/graham/Python/uwsgi-testing/lib/python2.6/lib-dynload', '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6', '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/plat-mac/lib-scriptpackages', '/Users/graham/Python/uwsgi-testing/lib/python2.6/site-packages', '/Users/graham/Python/uwsgi-testing/lib/python2.6/site-packages/newrelic-1.8.0.13']
WSGI app 0 (mountpoint='') ready in 0 seconds on interpreter 0x1003096a0 pid: 2642 (default app)
spawned uWSGI master process (pid: 2642)
spawned uWSGI worker 1 (pid: 2643, cores: 1)
spawned uWSGI worker 2 (pid: 2645, cores: 1)
subprocess 2644 exited with code 0
[pid: 2643|app: 0|req: 1/1] 127.0.0.1 () {40 vars in 1380 bytes} [Fri Nov 23 14:43:17 2012] GET / => generated 11053 bytes in 4 msecs (HTTP/1.1 200) 1 headers in 45 bytes (1 switches on core 0)
[pid: 2645|app: 0|req: 1/2] 127.0.0.1 () {40 vars in 1380 bytes} [Fri Nov 23 14:43:17 2012] GET / => generated 11053 bytes in 3 msecs (HTTP/1.1 200) 1 headers in 45 bytes (1 switches on core 0)
[pid: 2645|app: 0|req: 2/3] 127.0.0.1 () {40 vars in 1380 bytes} [Fri Nov 23 14:43:18 2012] GET / => generated 11053 bytes in 0 msecs (HTTP/1.1 200) 1 headers in 45 bytes (1 switches on core 0)
[pid: 2645|app: 0|req: 3/4] 127.0.0.1 () {40 vars in 1380 bytes} [Fri Nov 23 14:43:18 2012] GET / => generated 11053 bytes in 0 msecs (HTTP/1.1 200) 1 headers in 45 bytes (1 switches on core 0)
[pid: 2645|app: 0|req: 4/5] 127.0.0.1 () {40 vars in 1380 bytes} [Fri Nov 23 14:43:18 2012] GET / => generated 11053 bytes in 1 msecs (HTTP/1.1 200) 1 headers in 45 bytes (1 switches on core 0)
^CSIGINT/SIGQUIT received...killing workers...
Exception in thread NR-Activate-Session/Python Application:
Traceback (most recent call last):
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/threading.py", line 522, in __bootstrap_inner
    self.run()
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/threading.py", line 477, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/Users/graham/Python/uwsgi-testing/lib/python2.6/site-packages/newrelic-1.8.0.13/newrelic/core/application.py", line 260, in connect_to_data_collector
    self.linked_applications, environment_settings(),
  File "/Users/graham/Python/uwsgi-testing/lib/python2.6/site-packages/newrelic-1.8.0.13/newrelic/core/environment.py", line 25, in environment_settings
    env.append(('Arch', platform.machine()))
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/platform.py", line 1264, in machine
    return uname()[4]
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/platform.py", line 1194, in uname
    processor = _syscmd_uname('-p','')
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/platform.py", line 951, in _syscmd_uname
    rc = f.close()
IOError: [Errno 10] No child processes

goodbye to uWSGI.