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

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.

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