flannel service shows 'failed' after stopping

[yuqi-zhang]

For the flannel system container, the service is working fine, but shows 'failed' after running systemctl stop flannel despite there being no visible error:

● flannel.service - Flanneld overlay address etcd agent
Loaded: loaded (/etc/systemd/system/flannel.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Wed 2017-01-18 17:49:51 UTC; 2s ago
Process: 13634 ExecStopPost=/bin/rm /etc/systemd/system/docker.service.d/flannel.conf (code=exited, status=0/SUCCESS)
Process: 13625 ExecStop=/bin/runc kill flannel (code=exited, status=0/SUCCESS)
Process: 12781 ExecStartPost=/usr/bin/sh -c while test \! -s /run/flannel/docker; do sleep 0.1; done (code=exited, status=0/SUCCESS)
Process: 12780 ExecStart=/bin/runc run flannel (code=exited, status=143) Main PID: 12780 (code=exited, status=143)

The service itself can be re-started with systemctl start flannel and there are no errors. I tried handling SIGTERM and there seems to be no difference. This is replicable in both F25/RHELAH.