This morning I did a luksOpen on an external harddisk and saw:
# cryptsetup luksOpen /dev/sde1 crypto2
Enter passphrase for /dev/sde1:
semid 557063: semop failed for cookie 0xd4dd6db: incorrect semaphore state
Failed to set a proper state for notification semaphore identified by
cookie value 223205083 (0xd4dd6db) to initialize waiting for incoming
# mount /dev/mapper/crypto2 /media
So stuff worked OK, just the unexpected messages.
I did find an ubuntu bug from 2011 so what needs fixing this time?