Have a look at <http://www.ussg.iu.edu/hypermail/linux/kernel/0709.2/2524.html>, where it becomes clear that this glibc patch causes communication failure between rpc.mountd (of nfs-utils 1.1.0) and the kernel during kernel upcalls to verify fh validity. This leads to the entire NFS server seizing up. It's been worked around in more recent nfs-utils releases, but still, this is not good. This patch needs to go.