Description

Steps to reproduce the issue:
See #17550
Looks like the patch doesn't fix the problem or we have a regression.

Describe the results you received:

WARN[0001] failed to cleanup ipc mounts:
failed to umount /var/lib/docker/containers/782bb68ccae1df58c864c6797d0a8a586e4619296326bd31f4a5053061426514/shm: invalid argument 

Describe the results you expected:
Don't log the warning, since it's not an issue.

Additional information you deem important (e.g. issue happens only occasionally):

Output of docker version:

17.06.0-dev

Output of docker info:

(paste your output here)

Additional environment details (AWS, VirtualBox, physical, etc.):