Comment 1 for bug 797226

Something weird happens:
The /dev/dm-10 is created on a freshly installed ubuntu 11.04. When I tried to create the logical volume again on the affected machine - it worked, albeit with a strange message:

  The link /dev/mf/lvmtest should had been created by udev but it was not found. Falling back to direct link creation.
  Logical volume "lvmtest" created

When I tried to remove it, I got an frightening message:

root@mf:~# lvremove /dev/mf/lvmtest
Do you really want to remove active logical volume lvmtest? [y/n]: y
  semid 524288: semop failed for cookie 0xd4d2311: incorrect semaphore state
  Failed to set a proper state for notification semaphore identified by cookie value 223159057 (0xd4d2311) to initialize waiting for incoming notifications.
  Logical volume "lvmtest" successfully removed

Googling for the keywords revealed similar problem on Fedora F15, which was solved by updated version of udev:
https://bugzilla.redhat.com/show_bug.cgi?id=690308

So looks like initial assignment of the bug to udev was correct after all.