Kernel not configured for semaphores

[Frédéric Bron]

Hi,

Each time I turn off Fedora 24, I get the following message about 50
times printed in the console:

Kernel not configured for semaphores (System V IPC). Not using udev
synchronisation code.
device-mapper: remove ioctl on fedora_alpha-root failed: Device or resource busy
Command failed

What  does that mean?

Thanks,

Frédéric