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From: Martin Simmons <martin@lispworks.com>
To: Luoqi Chen <luoqi.chen@gmail.com>
CC: rmacklem@uoguelph.ca, freebsd-fs@freebsd.org
In-reply-to: <CAHJqQjsP-w9LAS4AV64Pu9Jmv0kVFodKdT_jLUcyop3sNVh_EA@mail.gmail.com>
 (message from Luoqi Chen on Thu, 27 Feb 2020 14:58:55 -0800)
Subject: Re: Linux could write to read only files on FreeBSD NFS server
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>>>>> 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