Linux could write to read only files on FreeBSD NFS server

[Martin Simmons]

>>>>> On Thu, 27 Feb 2020 14:58:55 -0800, Luoqi Chen said:
> 
> One more piece of information that might help: this behavior started
> somewhere between centos 5 and 6, kernel 2.6.18 and 2.6.32, i.e., the same
> script would fail on 2.6.18. Timing wise I believe it coincided with the
> introduction of nfsv4.

Have you tried mounting it with nfsv3 recently?  I can't repeat it with that
version (I don't run nfsv4 at all).

__Martin