I've been experiencing occassional hangs on an NFS server running 
NetBSD 2.0.2 (Jul 24th sys.tar.gz source and prior up to the 2.0.2 release).
The NFS clients also run the same kernel as the NFS server but do not
experience hangs.

The machine hangs under normal load and can break to the debugger on
the console.  

I can not switch to single user mode by killing init, nor can I continue.
I can provide further details upon request.

A trace and a portion of the process table follow:

cpu_Debugger() at netbsd:cpu_Debugger+0x4
comintr() at netbsd:comintr+0x768
alpha_shared_intr_dispatch() at netbsd:alpha_shared_intr_dispatch+0x6c
sio_iointr() at netbsd:sio_iointr+0x40
interrupt() at netbsd:interrupt+0x278
XentInt() at netbsd:XentInt+0x1c
--- interrupt (from ipl 0) ---
ltsleep() at netbsd:ltsleep+0xe0
uvm_scheduler() at netbsd:uvm_scheduler+0xd4
check_console() at netbsd:check_console

 PID           PPID     PGRP        UID S   FLAGS LWPS          COMMAND    WAIT
 11548         8769     3013          0 2  0x6000    1              cut
 14530          780       11         92 2  0x4000    1            sleep
 2440         15827    15827         99 2  0x4002    1             more   ttyin
 8769         24297     3013          0 2  0x4000    1              ksh
 28533            1    28533          0 2   0x400    3            named       *
 28476        23388    28476         99 2  0x4002    1              ksh   ttyin
 23388          612      612          0 2  0x4000    1          telnetd
 15827         6981    15827         99 2  0x4002    1              ksh   pause
 6981           612      612          0 2  0x4000    1          telnetd
 14272        12465    12465         99 2  0x4002    1         htpasswd   ttyin
 12465        29790    12465         99 2  0x4002    1              ksh   pause
 29790          612      612          0 2  0x4000    1          telnetd    poll
 24297         3013     3013          0 2  0x4000    1              ksh   pause
 3013          3436     3013          0 2  0x4000    1               sh    wait
 3436          1326     1326          0 2       0    1             cron  piperd
 28072         5371    28072          0 2  0x4002    1              ksh   ttyin
 8596             1     8596         99 2  0x4002    1              ssh  ttyopn
 27571         4443    27571         99 2  0x4002    1              ksh   ttyin
 4443           612      612          0 2  0x4000    1          telnetd
 2320           703      703      32767 2   0x100    1            httpd  netcon
 13047          703      703      32767 2   0x100    1            httpd  netcon