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

[Steve Langasek]

I can confirm Serge's analysis here.  I'm surprised that this hasn't
bitten us more severely before now, given that I see all my compat
symlinks are wrong in my (iteratively upgraded) precise chroots here;
apparently things really don't care so much about the compat these days.

We should definitely fix this for .1.

** Also affects: sysvinit (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: lxc (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: sysvinit (Ubuntu Quantal)
   Importance: High
       Status: Confirmed

** Also affects: lxc (Ubuntu Quantal)
   Importance: High
     Assignee: Serge Hallyn (serge-hallyn)
       Status: Fix Released

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

** Changed in: sysvinit (Ubuntu Quantal)
       Status: Confirmed => Triaged

** Changed in: sysvinit (Ubuntu Precise)
       Status: New => Triaged

** Changed in: sysvinit (Ubuntu Precise)
   Importance: Undecided => High

** Changed in: sysvinit (Ubuntu Precise)
    Milestone: None => ubuntu-12.04.1

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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:
  Triaged
Status in “lxc” source package in Precise:
  Fix Released
Status in “sysvinit” source package in Precise:
  Triaged
Status in “lxc” source package in Quantal:
  Fix Released
Status in “sysvinit” source package in Quantal:
  Triaged

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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