nfsd stuck in *rc_lock state

[Robert Schulze]

Hello everybody,

we are running several 8.1 NFS Clients connected to a 8.0 NFS Server.
The system ran fine, but today the NFS-Server locked up.

nfsd ate 100% of CPU, with one {nfsd: service} thread in state 
"*rc_lock". I tried to find others with the same issue and finally ended 
up at a patch from Rick:

http://people.freebsd.org/~rmacklem/freebsd8.1-patches/replay.patch

may I apply this patch to a 8.0 system to fix this issue, or are there 
any other patches/commits which affect this?

with kind regards,

Robert Schulze