[arch-general] NFS "updates"?

[Hauke Fath]

On Mon, 27 Apr 2020 17:23:39 +0200, Markus Schaaf via arch-general 
wrote:
> Am 27.04.20 um 16:51 schrieb Hauke Fath:
> 
>> NFSV4: Unsupported transport protocol udp
> 
> Have you tried vers=3 in mount options?

Thanks for the reply. I'll give some of the configuration.

(1) autofs config is distributed through nis:

% grep '^[/]' /etc/automount/auto.master
/home   auto.home   
-udp,nfsvers=3,resvport,nolock,noacl,grpid,retrans=5,rsize=16384,wsize=16384,rw,hard,intr
/misc   auto.misc   
-udp,nfsvers=3,resvport,grpid,local_lock=none,retrans=5,rw,hard,intr
%

(2) The client autofs setup:

%  grep -v '^#' /etc/autofs/autofs.conf
[ autofs ]
timeout = 300
browse_mode = no
[ amd ]
dismount_interval = 300
%

This setup has worked for years, and continues to work after rolling 
back to the 2020-03-09 state. There is no nfsv4 anywhere in sight: The 
server setup disables it, and wherever I can specify nfsv3 on the 
client, I have.

From the journal:

[...]
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de automount[567]: 
attempting to mount entry /home/XXX
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de kernel: RPC: 
Registered named UNIX socket transport module.
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de kernel: RPC: 
Registered udp transport module.
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de kernel: RPC: 
Registered tcp transport module.
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de kernel: RPC: 
Registered tcp NFSv4.1 backchannel transport module.
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de kernel: FS-Cache: 
Netfs 'nfs' registered for caching
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de kernel: *** 
VALIDATE nfs ***
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de kernel: *** 
VALIDATE nfs4 ***
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de kernel: NFSv4: 
Unsupported transport protocol udp
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de automount[567]: >> 
mount.nfs: an incorrect mount option was specified
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de automount[567]: 
mount(nfs): nfs: mount failure NFSSERVER:/u/homes/XXX on /home/XXX
Apr 27 16:27:20 Ankogel.nt.e-technik.tu-darmstadt.de automount[567]: 
failed to mount /home/XXX
[...]

AFAICS, the kernel has no business "validating" an nfsv4 mount, because 
none has been asked for.

The 2020-03-09 setup:

[...]
Apr 27 18:57:11 Ankogel.nt.e-technik.tu-darmstadt.de automount[546]: 
attempting to mount entry /home/XXX
Apr 27 18:57:11 Ankogel.nt.e-technik.tu-darmstadt.de kernel: RPC: 
Registered named UNIX socket transport module.
Apr 27 18:57:11 Ankogel.nt.e-technik.tu-darmstadt.de kernel: RPC: 
Registered udp transport module.
Apr 27 18:57:11 Ankogel.nt.e-technik.tu-darmstadt.de kernel: RPC: 
Registered tcp transport module.
Apr 27 18:57:11 Ankogel.nt.e-technik.tu-darmstadt.de kernel: RPC: 
Registered tcp NFSv4.1 backchannel transport module.
Apr 27 18:57:11 Ankogel.nt.e-technik.tu-darmstadt.de kernel: FS-Cache: 
Netfs 'nfs' registered for caching
Apr 27 18:57:11 Ankogel.nt.e-technik.tu-darmstadt.de automount[546]: 
mounted /home/XXX
[...]

From what I can see, either I missed some obscure new configuration 
that overrides the automounter's explicit mount options. Or, I hit a 
kernel bug.

Cheerio,
Hauke

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