After one of the last Tumbleweed updates, the nfs kernel server doesn't work
correctly any more. An nfs mount command from another machine doesn't return,
it hangs forever and nothing is mounted.

Old working configuration
-------------------------
nfs-client-2.6.2-38.1
nfs-kernel-server-2.6.2-38.1

Syslog:
Aug 23 17:08:36 orion rpc.mountd[19233]: v4.0 client attached:
0x131b2e4a64e620dc from "192.168.1.21:991"

The mount command on the client machine returns immediately and the remote
directory is mounted correctly.


New non working configuration
-----------------------------
nfs-client-2.6.3-39.4
nfs-kernel-server-2.6.3-39.4

Syslog:
Aug 23 16:47:37 orion rpc.mountd[18307]: auth_unix_ip: inbuf 'nfsd
192.168.1.21'
Aug 23 16:47:37 orion rpc.mountd[18307]: successful authentication for IP
192.168.1.21 as 192.168.1.0/24
Aug 23 16:47:37 orion rpc.mountd[18307]: auth_unix_ip: client 0x5619032d0770
'192.168.1.0/24'
Aug 23 16:47:37 orion rpc.mountd[18307]: v4.0 client attached:
0x131b2e4764e61c00 from "192.168.1.21:717"
Aug 23 16:47:37 orion rpc.mountd[18307]: nfsd_fh: inbuf '192.168.1.0/24 1
\x00000000'
Aug 23 16:47:37 orion rpc.mountd[18307]: nfsd_fh: found 0x5619032d2410 path /


The mount command on the client machine doesn't return and nothing is mounted.
After killing the mount command, this line appears in the servers syslog:
Aug 23 16:53:55 orion rpc.mountd[18307]: v4.0 client detached:
0x131b2e4764e61c00 from "192.168.1.21:717"

There's no difference, whether NFSv4 or NFSv3 is used and there's no message in
the syslog of the client machine.