NFS: SECINFO: security flavor 390003 is not supported

Dave Jones
2017-01-04T19:23:19Z

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