On Tue, Mar 20 2018, J. Bruce Fields wrote:

> On Fri, Mar 16, 2018 at 10:44:23AM +1100, NeilBrown wrote:
>> 
>> nfs4_proc_exchange_id() can return -EINVAL if the server
>> reported NFS4INVAL (which I have seen in a packet trace),
>
> Can you say which server this was?  (One we can fix?)

Unfortunately not - all I know is that it is a bit old and isn't SUSE
(which doen't really narrow it down at all).
I've asked for more details and will pass on anything I discover.

Thanks,
NeilBrown