After upgrading NFS4 server to Ubuntu Quantal, krb5 mounts hang under nfs-utils 1.2.6-3ubuntu2

[AleksanderAdamowski]

This is probably a manifestation of upstream Debian bug:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=682709

After upgrading my server from Precise Pangolin to Quantal Quetzal, the NFS4 service's mounts from clients started to hang.

Looking at verbose logs of all involved RPC daemons, the problem seems to either be with rpc.svcgssd or rpc.mountd, which are contained in nfs-kernel-server package. The last lines reported in the verbose daemon logs are:

Nov 10 12:25:26 hostname rpc.svcgssd[1547]: entering poll
Nov 10 12:25:26 hostname rpc.mountd[1550]: auth_unix_ip: inbuf 'nfsd 192.168.1.123'

WORKING WORKAROUND:

Downgrade nfs to the version from Precise Pangolin and prevent it from being automatically upgraded to the Quantal version:

$ wget http://de.archive.ubuntu.com/ubuntu/pool/main/n/nfs-utils/nfs-common_1.2.5-3ubuntu3.1_amd64.deb

$ wget http://de.archive.ubuntu.com/ubuntu/pool/main/n/nfs-utils/nfs-kernel-server_1.2.5-3ubuntu3.1_amd64.deb

$ sudo dpkg -i nfs-common_1.2.5-3ubuntu3.1_amd64.deb nfs-kernel-server_1.2.5-3ubuntu3.1_amd64.deb

$ (echo "nfs-common hold"; echo "nfs-kernel-server hold") | sudo dpkg --set-selections

[AleksanderAdamowski (aadamowski)]

Note that this bug has apparently been fixed in the upstream Debian nfs package with version 1:1.2.6-4:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=682709#71

[Steve Langasek (vorlon)]

marking as fixed in saucy.

[AleksanderAdamowski (aadamowski)]

Any chance of releasing the fixed packages for raring?

[Steve Langasek (vorlon)]

Given available resources to work on this package, I'm afraid I would say that's unlikely.

[Yves Dorfsman (dorfsmay)]

Another work around is to use the packages from Debian. You need both (kernel-server depends on common):

http://packages.debian.org/wheezy/nfs-common
http://packages.debian.org/wheezy/nfs-kernel-server

They install nicely on 13.04, and solve the issue!!!