Bug Report

• Concourse version: 3.11.0
• Deployment type (BOSH/Docker/binary): docker
• Infrastructure/IaaS: Ubuntu 16.04 VM
• Did this used to work? yes in 3.10.0

When restarting a worker (or rebooting the machine), 3.11.0 workers fail to start if the volumes.img already exists.
Removing the file allows the worker to start, but fails on next restart/reboot.