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

Reply: Ganbold Tsagaankhuu : "Re: NFS issue - newnfs_request: Wrong session srvslot=1 slot=0, freeing free slot!!"
In reply to: Ganbold Tsagaankhuu : "NFS issue - newnfs_request: Wrong session srvslot=1 slot=0, freeing free slot!!"
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From: Rick Macklem <rmacklem_at_uoguelph.ca>
Date: Fri, 26 Aug 2022 03:18:15 UTC

Ganbold Tsagaankhuu <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
> Aug 26 02:21:42 iron2 kernel: freeing free slot!!
> Aug 26 02:21:43 iron2 kernel: newnfs_request: Wrong session srvslot=1 slot=0
> Aug 26 02:21:43 iron2 kernel: freeing free slot!!
> Aug 26 02:21:54 iron2 kernel: newnfs_request: Wrong session srvslot=1 slot=0
> Aug 26 02:21:54 iron2 kernel: freeing free slot!!
> Aug 26 02:21:58 iron2 kernel: newnfs_request: Wrong session srvslot=1 slot=2
> Aug 26 02:21:58 iron2 kernel: retseq diff 0x1
> Aug 26 02:21:58 iron2 kernel: freeing free slot!!
> Aug 26 02:21:59 iron2 kernel: newnfs_request: Wrong session srvslot=1 slot=2
> Aug 26 02:21:59 iron2 kernel: retseq diff 0x1
> Aug 26 02:21:59 iron2 kernel: freeing free slot!!
> Aug 26 02:22:12 iron2 kernel: newnfs_request: Wrong session srvslot=0 slot=2
> Aug 26 02:22:12 iron2 kernel: retseq diff 0x1
> Aug 26 02:22:12 iron2 kernel: freeing free slot!!
> Aug 26 02:22:14 iron2 kernel: newnfs_request: Wrong session srvslot=1 slot=0
> Aug 26 02:22:14 iron2 kernel: freeing free slot!!
> Aug 26 02:22:15 iron2 kernel: newnfs_request: Bad session slot=1
> Aug 26 02:22:15 iron2 kernel: freeing free slot!!
> Aug 26 02:22:30 iron2 kernel: newnfs_request: Wrong session srvslot=1 slot=2
> Aug 26 02:22:30 iron2 kernel: retseq diff 0x1
> Aug 26 02:22:30 iron2 kernel: freeing free slot!!
> Aug 26 02:22:31 iron2 kernel: newnfs_request: Bad session slot=1
> Aug 26 02:22:31 iron2 kernel: freeing free slot!!
> 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?
- 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.
     
thanks a lot,

Ganbold