Re: NFS issue - newnfs_request: Wrong session srvslot=1 slot=0, freeing free slot!!

Rick,

On Sat, Aug 27, 2022 at 6:17 AM Rick Macklem <rmacklem@uoguelph.ca> wrote:

> Ganbold Tsagaankhuu <ganbold@gmail.com> wrote:
> > > Rick,
> > >
> > > On Fri, Aug 26, 2022 at 11:18 AM Rick Macklem > ><rmacklem@uoguelph.ca
> <mailto:rmacklem@uoguelph.ca>> wrote:
> Ganbold Tsagaankhuu <ganbold@gmail.com<mailto:ganbold@gmail.com>> wrote:
> > > > Hi,
> > > >
> > > > We are having trouble with NFS running on STABLE:
> > > >
> > > > Aug 26 02:21:42 iron2 kernel: newnfs_request: Wrong session
> srvslot=1 slot=0
> [stuff snipped]
> > > > Aug 26 02:22:46 iron2 kernel: newnfs_request: Wrong session
> srvslot=1 slot=0
> > > > Aug 26 02:22:46 iron2 kernel: freeing free slot!!
> > > >
> > > > We are running FreeBSD 13.1-STABLE #3 stable/13-n252198-c1434fd2dea:
> Fri Aug 26 01:51:53 UTC 2022 and mount options are:
> > > >
> > > > rw,nfsv4,minorversion=1,bg,soft,timeo=20,retrans=5,retrycnt=5
> > > > ro,nfsv4,minorversion=1,bg,soft,timeo=20,retrans=5,retrycnt=5
> > > >
> > > > Is there any fix for this issue?
> Oh, and one more thing. If you have multiple clients mounting the
> NFSv4 server, make sure they all have unique hostids.
> Check /etc/hostid and "sysctl kern.hostuuid". If two clients have the
> same kern.hostuuid, there will be lots of trouble.
>

I see, we have 2 servers (NFS clients) running:

FreeBSD 13.1-STABLE #1 stable/13-n252199-9644bc4a112
FreeBSD 13.1-STABLE #3 stable/13-n252198-c1434fd2dea

and no more errors so far.
However 2 servers have the same hostid.
We will fix that and also will use hard mounts.

thanks a lot,

Ganbold



>
> rick
>
> > - Don't use "soft" mounts. See the Bugs section of "man mount_nfs".
> >   There are patches in stable/13 dated July 10, 2022. (I have no idea
> >   how to tell if n252198 would have them) that help, but use of "soft"
> >   mounts will never work correctly for NFSv4.
> > - The attached small patch (not committed yet, but should be in
> >   stable/13 in about 10days) fixes a couple of corner cases. If you
> >   are using a FreeBSD NFS server, I believe these corner cases only
> >   occur after the NFS server reboots.
> >
> > rick
> > ps: If you test the attached patch, please let me know how it goes.
> >
> > Is this patch for NFS server? We are using Netapp NFS server on server
> side.
> No, it is for the client. However, as far as I know, a Netapp Filer never
> generates a NFSERR_BADSESSION error (except maybe if you were using
> a post-July 10. 2022 client), so the patch probably doesn't affect you.
> (Get rid of "soft" and you should be happy.)
>
> rick
>
> thanks,
>
> Ganbold
>
>
>
> thanks a lot,
>
> Ganbold
>
>
>