The rpc.mountd in RedHat 6.0 appears to have a memory
leak.  I have a file server and 6 diskless clients we
use for kernel development.  The clients mount all their
file systems off of the file server.  The server has a
fresh RedHat 6.0 installation.  All are running the 2.2.5
kernel.  Only the clients are booting with modified
kernels, the server's kernel is 2.2.5.  After several days,
the rpc.mountd process on the server can grow to 30MB.
Note that the clients are at times rebooted often and
each time they remount 5 file systems off of the server.
I've emailed the author listed in the mountd sources, but
haven't received a response.