Bug#599596: /sbin/lvcreate: Does not clean up semaphore arrays after use

[Sam Morris]

Package: lvm2
Version: 2.02.39-8
Severity: grave
File: /sbin/lvcreate
Justification: renders package unusable

I have a backup script which creates and destroys LVM snapshots ever
day. A few days after upgrading to device mapper 2:1.02.48-3, the backup
lvcreate began to fail with the following message:

|   device-mapper: create ioctl failed: Device or resource busy
|   Aborting. Failed to activate snapshot exception store.

This is caused by the system limit on the number of semaphore arrays
being reached.

It seems that lvcreate/lvremove operations each create a number of
semarphore arrays, but to not remove them before exiting:

$ sudo ipcs -s | wc -l
121

$ sudo lvcreate -s -L 1G -n blah thoth/home
  /dev/dm-8: open failed: No such device or address
  Logical volume "blah" created

$ sudo ipcs -s | wc -l
124

$ sudo lvremove thoth/blah
Do you really want to remove active logical volume "blah"? [y/n]: y
  Logical volume "blah" successfully removed

$ sudo ipcs -s | wc -l
127

$ sudo lvcreate -s -L 1G -n blah thoth/home
  /dev/dm-8: open failed: No such device or address
  /dev/dm-9: open failed: No such device or address
  /dev/dm-15: open failed: No such device or address
  Logical volume "blah" created

$ sudo ipcs -s | wc -l
130

$ sudo lvremove thoth/blah
Do you really want to remove active logical volume "blah"? [y/n]: y
  Limit for the maximum number of semaphores reached. You can check and set the limits in /proc/sys/kernel/sem.
  Unable to deactivate thoth-home-real (253:9)
  Failed to resume home.
  Logical volume "blah" successfully removed

$ sudo ipcs -s | wc -l
132

$ sudo lvcreate -s -L 1G -n blah thoth/home
  /dev/dm-8: open failed: No such device or address
  /dev/dm-15: open failed: No such device or address
  Limit for the maximum number of semaphores reached. You can check and set the limits in /proc/sys/kernel/sem.
  Unable to resume thoth-blah (253:8)
  Aborting. Failed to activate snapshot exception store.

-- System Information:
Debian Release: squeeze/sid
  APT prefers stable
  APT policy: (550, 'stable'), (530, 'testing'), (520, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-bpo.5-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages lvm2 depends on:
ii  libc6                        2.11.2-6    Embedded GNU C Library: Shared lib
ii  libdevmapper1.02.1           2:1.02.48-3 The Linux Kernel Device Mapper use
ii  libreadline5                 5.2-3.1     GNU readline and history libraries
ii  lsb-base                     3.2-20      Linux Standard Base 3.2 init scrip

Versions of packages lvm2 recommends:
ii  dmsetup                      2:1.02.48-3 The Linux Kernel Device Mapper use

lvm2 suggests no packages.

-- no debconf information