I've been running Docker in production for a year and both of these issues were very real.

I got bit hard by this issue:

https://github.com/docker/docker/issues/20079

when CoreOS stable channel updated Docker. All my data volume containers broke during the migration and migration could not be reverted.

As for the second issue: when two systemd services that pull containers with the same base images would start simultaneously, they would deadlock pretty reliably. Had to flock every pull as a result. This might be fixed by now though.