NFS: SECINFO: security flavor 390003 is not supported

[Dave Jones]

Since upgrading to 4.10-rc2, my nfs server has started printing these..

[  161.668635] NFS: SECINFO: security flavor 390003 is not supported
[  161.668655] NFS: SECINFO: security flavor 390004 is not supported
[  161.668670] NFS: SECINFO: security flavor 390005 is not supported

Client is debian's 4.8 kernel with default mount options, so sec=sys

What should I be doing to suppress these ? What causes them ?

	Dave