Description of problem:
After the online fedora update, NFS server silently stopped to work.
After lots of investigation I've found out that RPCNFSDCOUNT of
/etc/sysconfig/nfs is mishandled. If it is commented out, the
NFS server will fail to work. It appeared to be commented out
because I ended up with nfs.rpmnew where it was not commented.
The bug seems to be in
/lib/systemd/system/nfs-server.service
and the following change seems to fix the problem:
---
--- nfs-server.service.old	2012-06-22 21:36:20.000000000 +0400
+++ nfs-server.service	2012-10-25 20:06:43.888744824 +0400
@@ -11,7 +11,7 @@
 EnvironmentFile=-/etc/sysconfig/nfs
 ExecStartPre=/usr/lib/nfs-utils/scripts/nfs-server.preconfig
 ExecStartPre=/usr/sbin/exportfs -r
-ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS ${RPCNFSDCOUNT}
+ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS $RPCNFSDCOUNT
 ExecStartPost=-/usr/lib/nfs-utils/scripts/nfs-server.postconfig
 ExecStop=/usr/sbin/rpc.nfsd 0
 ExecStopPost=/usr/sbin/exportfs -f
---

Version-Release number of selected component (if applicable):
nfs-utils-1.2.6-3.fc17.x86_64

How reproducible:
Easily

Steps to Reproduce:
1. Comment out RPCNFSDCOUNT in /etc/sysconfig/nfs
2. restart nfs.service
3. try to mount nfs
  
Actual results:
mount locks up forever, silently

Expected results:
mount should succeed

Additional info: