Python multiprocessing: Permission denied

t0ster tosters at
Tue Jan 5 22:52:18 CET 2010

Hi guys, I'm getting an error when trying to execute python program
that uses multiprocessing package:

  File "/usr/local/lib/python2.6/multiprocessing/", line
178, in RLock
    return RLock()
  File "/usr/local/lib/python2.6/multiprocessing/", line
142, in __init__
    SemLock.__init__(self, RECURSIVE_MUTEX, 1, 1)
  File "/usr/local/lib/python2.6/multiprocessing/", line
49, in __init__
    sl = self._semlock = _multiprocessing.SemLock(kind, value,
OSError: [Errno 13] Permission denied

It looks like the user don't have permission to access shared memory.
When executing with root privileges it works fine.

Is there any solution to run it as normal user(not root)?

Python version 2.6.2 , OS is Linux 2.6.18 (CentOS release 5.4) and
it's VPS machine.

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