I get the same "semop failed for cookie 0xd4daad3: incorrect semaphore state" 
errors when removing an LVM volume:
root@mf:~# lvremove /dev/mf/lvmtest3
Do you really want to remove active logical volume lvmtest3? [y/n]: y
  semid 393216: semop failed for cookie 0xd4daad3: incorrect semaphore state
  Failed to set a proper state for notification semaphore identified by cookie 
value 223193811 (0xd4daad3) to initialize waiting for incoming notifications.
  Logical volume "lvmtest3" successfully removed
root@mf:~# lvremove /dev/mf/lvmtest3

The bug was filed on "lvm2" over here:
https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/797226

Could be the bug is related...

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https://bugs.launchpad.net/bugs/719388

Title:
  semop failed for cookie 0xd4d09ef: incorrect semaphore state during
  luksOpen

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