mount.nfs fails stating incorrect mount option but succeeds if -v option is used

Given the mounts did work if I used the -v option from the command line, I experimented with adding the options shown in the verbose output to the fstab options.

If I add the proto=udp option "an incorrect mount option" error message goes away and the mount succeeds as before.

n2:/db /db nfs auto,nfsvers=3,proto=udp 0 0

I tried the other options, and the ordering of the options, and found adding proto=udp was the option that made the error go away.

As can be seen from the verbose output, in this instance I am trying to mount volumes on an older server that only supports NFS vers 3.

This was actually not a bug. While NFS uses UDP by default, autofs5 seems to use TCP. The way to mount UDP NFS exports is to specify this as an option for the mount point.

Yes, this problem is present in final release.

Hello,
I am having the problem as well. I have two NFS mounts. The first on works perfectly. The second one I added never mounts, unless I mount it manually at the command line. When I mount it from the command line, I get no errors. Below is my fstab.

Robert?field.comment=Hello,
I am having the problem as well. I have two NFS mounts. The first on works perfectly. The second one I added never mounts, unless I mount it manually at the command line. When I mount it from the command line, I get no errors. Below is my fstab.

I do not have the udp switch being used. The NFS server is 9.04.

Robert

Hello,

We have this problem too.
Maybe this bug is not nfs related but autofs related.
But I still don't understand why you mark this bug as Invalid.

Thanks in advance.
Merry Christmas.
Marc

Using "nfsvers=2" worked for me, but if you need =3, this seems like a bug in util-linux.

Can you run mount under strace -F -eexecve and see if the arguments it passes to mount.nfs are different when you add the -v? If not then the bug is in mount.nfs rather than mount.

stumbled across this trying to debug my mount issues. Here is my strace attempting a default mount from the command line. The same autofs setup (auto.master, etc) work fine on SL 6.6 fwiw

strace -f -eexecve mount server:/export/ufs/hp /mnt
execve("/bin/mount", ["mount", "server:/export/ufs/hp", "/mnt"], [/* 51 vars */]) = 0
Process 14364 attached
Process 14363 suspended
[pid 14364] execve("/sbin/mount.nfs", ["/sbin/mount.nfs", "server:/export/ufs/hp", "/mnt", "-o", "rw"], [/* 47 vars */]) = 0
mount.nfs: an incorrect mount option was specified
Process 14363 resumed
Process 14364 detached
--- SIGCHLD (Child exited) @ 0 (0) ---