Public bug reported:
Binary package hint: python3.1
Just upgraded to 10.10beta.
Python3.1 programs trying to use multiprocessing.Pool exit with the
following error message:
Traceback (most recent call last):
File "/usr/lib/python3.1/multiprocessing/synchronize.py", line 28, in <module>
from _multiprocessing import SemLock
ImportError: cannot import name SemLock
...
pool = Pool(processes = options.num_processes)
File "/usr/lib/python3.1/multiprocessing/pool.py", line 84, in __init__
self._setup_queues()
File "/usr/lib/python3.1/multiprocessing/pool.py", line 133, in _setup_queues
from .queues import SimpleQueue
File "/usr/lib/python3.1/multiprocessing/queues.py", line 22, in <module>
from multiprocessing.synchronize import Lock, BoundedSemaphore, Semaphore,
Condition
File "/usr/lib/python3.1/multiprocessing/synchronize.py", line 33, in <module>
" function, see issue 3770.")
ImportError: This platform lacks a functioning sem_open implementation,
therefore, the required synchronization primitives needed will not function,
see issue 3770.
I was debugging my code (not the multiprocessing part, by the way) just while
upgrading to 10.10beta.
Everything worked fine before, suddenly stopped working during the "packages
installation" stage of the upgrade.
The problem seems to be related to a wrong build process for the package.
Output of "lsb_release -rd":
Description: Ubuntu maverick (development branch)
Release: 10.10
Output of "apt-cache policy python3.1":
python3.1:
Installed: 3.1.2+20100707-1ubuntu1
Candidate: 3.1.2+20100707-1ubuntu1
Version table:
*** 3.1.2+20100707-1ubuntu1 0
500 http://archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages
100 /var/lib/dpkg/status
** Affects: python3.1 (Ubuntu)
Importance: Undecided
Status: New
--
Support for multiprocessing broken in python3.1
https://bugs.launchpad.net/bugs/630511
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