[Bug 974584] Re: Semaphores cannot be created in lxc container

[Launchpad Bug Tracker]

This bug was fixed in the package lxc - 0.7.5-3ubuntu51

---------------
lxc (0.7.5-3ubuntu51) precise; urgency=low

  * 0070-templates-rmdir-dev-shm: in precise containers, rmdir $rootfs/dev/shm
    and and create it as a symbolic link to /run/shm.  (LP: #974584)
 -- Serge Hallyn <serge.hallyn at ubuntu.com>   Thu, 12 Apr 2012 09:54:22 -0500

** Changed in: lxc (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/974584

Title:
  Semaphores cannot be created in lxc container

Status in Launchpad itself:
  Invalid
Status in “lxc” package in Ubuntu:
  Fix Released
Status in “sysvinit” package in Ubuntu:
  Confirmed

Bug description:
  >>> from multiprocessing import synchronize
  >>> synchronize.Lock()
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/usr/lib/python2.6/multiprocessing/synchronize.py", line 117, in __init__
      SemLock.__init__(self, SEMAPHORE, 1, 1)
    File "/usr/lib/python2.6/multiprocessing/synchronize.py", line 49, in __init__
      sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue)
  OSError: [Errno 38] Function not implemented

  Thanks to hallyn, there's a workaround and a fix: adding this line to the container's fstab will fix the problem:
  none dev/shm tmpfs defaults 0 0

  He is updating the ubuntu template with this change.

  Original bug report description was Launchpad related (celery tests
  fail on parallel testing instances)

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