Comment 3 for bug 1692093

The config:
fs_setup:
- label: etcd_disk
  filesystem: ext4
  device: /dev/sdc1
  extra_opts:
    - "-F"
    - "-E"
    - "lazy_itable_init=1,lazy_journal_init=1"

is kind of wierd.

Looking at the code I think if you specifically said:
 device: /dev/sdc
 partition: 1

Then you'd get what you wanted.
The code definitely is buggy in the path you've exposed, but I'd be interested in knowing if changing the device specification to above makes it behave differently.