I'm doing a git (as we speak) between 2.6.24-12.18 and 2.6.24-14-25 on
my Ubuntu Hardy system.  I'm assuming for the moment that 2.6.24-12.18
is a known "good" version of rpcb_clnt.c.  In addition, I'll be
installing a 2.6.26 kernel + patches from source on my system and
retesting.

In the meantime are we certain that there is not another issue in play?
For instance, in my case, I'm running on a Sun x4100 so this means I
have a nForce NIC and use the forcedeth driver.  Periodically my NIC
will go vegetative and instance is denoted with messages like:

  Jul 31 12:53:16 prod-unix-shell04 kernel: [  596.950188] nv_stop_tx:
TransmitterStatus remained busy<6>eth0: link up.

When this happens my system will fall of the network until it is power
cycled -- as using ifup, ifconfig, or even a reboot doesn't set the NIC
straight.  Sometimes this happens when I'm using NFSv4 and sometimes
this happens when I'm not.  It always happens when I'm doing lots of I/O
(apt, bonnie++, SQL queries, dd, etc.).

Given what's been described here earlier (RE: pulling network cable and
watching nfsv4 go haywire) I'm curious if the problem is not limited to
changes to rpcb_clnt.c.

Does anyone have thoughts on this?

-- 
kernel bug rpc nfs client
https://bugs.launchpad.net/bugs/212485
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