Pythons subprocess with WSGI + Apache mpm-worker: IOError 4

Hello,

I hope it's okay to if I just share a StackOverflow link here because
I've explained the problem in detail there:
http://stackoverflow.com/questions/8678897/

I hope any of you guys encountered the same error because I don't know
what to do next. It works on a second virtual machine running the same
software (but quota isn't doing anything there) and I can't figure out
why.

Thanks for your replies

For all who don't want to open StackOverflow a copy below:
I have a strange problem here which solution I can't figure out by
searching the net :/

After switching Apache from mpm-prefork to mpm-worker, using
subprocess in my (Django) Python WSGI application raises the following
exception after hanging for a couple of time:

IOError at /
[Errno 4] Interrupted system call

The call in question is:

out = check_output(['sudo', 'quota', user_id])

where check_output is a backport of this function from Python 2.7
while I'm using Python 2.6 from Debian Squeeze repositories.

The processes, in fact, seem to be executed, but die:

ps aux | grep quota
root 15378 0.0 0.0 21864 1176 ? S 02:34 0:00 sudo
quota ...SOME_ID...
root 15379 0.0 0.0 0 0 ? Z 02:34 0:00
[quota] <defunct>

The Apache configuration is no more than setting the WSGIScriptAlias
and some directory directives.

Am I missing the obvious?

Greets Sebastian

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