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

[Serge Hallyn]

Here is version tested and working in debootstrap.

diff -u sysvinit-2.88dsf/debian/changelog sysvinit-2.88dsf/debian/changelog
--- sysvinit-2.88dsf/debian/changelog
+++ sysvinit-2.88dsf/debian/changelog
@@ -1,3 +1,12 @@
+sysvinit (2.88dsf-13.10ubuntu12) quantal; urgency=low
+
+  * initscripts.postinst: if /dev is not a separate partition and we're in a
+    chroot, then create /run/shm and make /dev/shm a symbolic link to it, as
+    we would expect to find in a upgraded and rebooted running system.
+    (LP: #974584) (Closes: #674178)
+
+ -- Serge Hallyn <serge.hallyn at ubuntu.com>  Wed, 30 May 2012 12:17:37 -0500
+
 sysvinit (2.88dsf-13.10ubuntu11) precise; urgency=low
 
   * Only try to move links in /etc/rc{0,6}.d that match "S0*".  LP: #941867.
diff -u sysvinit-2.88dsf/debian/initscripts.postinst sysvinit-2.88dsf/debian/initscripts.postinst
--- sysvinit-2.88dsf/debian/initscripts.postinst
+++ sysvinit-2.88dsf/debian/initscripts.postinst
@@ -255,7 +255,12 @@
 
 		# Symlink /dev/shm from /run/shm
 		# Note that it's really /var/run/shm
-		compat_link /dev/shm /run/shm
+        if ! mountpoint -q /dev ; then
+            [ ! -d /run/shm ] && mkdir -p /run/shm
+            [ ! -d /dev/shm ] && compat_link /run/shm /dev/shm
+        else
+            compat_link /dev/shm /run/shm
+        fi
 	fi
 # Host system, not a chroot.
 else


** Patch added: "sysvinit-shm3.debdiff"
   https://bugs.launchpad.net/launchpad/+bug/974584/+attachment/3169450/+files/sysvinit-shm3.debdiff

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to sysvinit in Ubuntu.
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
Status in “sysvinit” package in Debian:
  New

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)

To manage notifications about this bug go to:
https://bugs.launchpad.net/launchpad/+bug/974584/+subscriptions