rsync + hammer + nfs = trouble

[Aggelos Economopoulos]

Tried using hammer for the first time today. Created a hammer volume on
two partitions, exported it over nfs, mounted it on my fileserver and
tried rsyncing some GB of data. After 20+ GB, the machine starts acting
up: I can't start new processes (command line editing over ssh works though)
and the rsync processes on the non-dfly box is stuck. Taking a look at the
console, I can see three "cache_lock: blocked on 0x... (.filename.c.garbage)"
messages. Some nfs-hammer interaction perhaps?

Aggelos