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In-Reply-To: <163001427749.7591.7281634750945934559@noble.neil.brown.name>
From:   Mike Javorski <mike.javorski@gmail.com>
Date:   Thu, 26 Aug 2021 17:07:50 -0700
Message-ID: <CAOv1SKC+3LXhM+L9MwU2D03bpeof55-g+i=r3SWEjVWcPVCi8Q@mail.gmail.com>
Subject: Re: NFS server regression in kernel 5.13 (tested w/ 5.13.9)
To:     NeilBrown <neilb@suse.de>
Cc:     Chuck Lever III <chuck.lever@oracle.com>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

I just tried the same mount with 4 different nfsvers values: 3, 4.0, 4.1 and 4.2

At first I thought it might be "working" because I only got freezes
with 4.2 at first, but I went back and re-tested (to be sure) and got
freezes with all 4 versions. So the nfsvers setting doesn't seem to
have an impact. I did verify at each pass that the 'nfsvers=' value
was present and correct in the mount output.

FYI: another user posted on the archlinux reddit with a similar issue,
I suggested they try with a 5.12 kernel and that "solved" the issue
for them as well.

- mike

On Thu, Aug 26, 2021 at 2:44 PM NeilBrown <neilb@suse.de> wrote:
>
> On Fri, 27 Aug 2021, Mike Javorski wrote:
> > I finally had the chance to test with the offloading disabled on the
> > server. Unfortunately, the issues remain, may even be more frequent,
> > but I can't rule out confirmation bias on that one.
> >
> > Not sure where to go from here.
>
> Have you tried NFSv3?  Or 4.0?
> I am (or was) leaning away from thinking it was an nfsd problem, but we
> cannot rule anything out until we know that is happening.
>
> I plan to have another dig through the code changes today.
>
> NeilBrown