i've got a netbsd/i386 box running 1.5F and exporting a bunch of NFS
volumes.  it will reliably hang after moderate/heavy use after a few
hours, such as a diskless netbsd client running make build, all over
nfs.

on the server, i've got this:

[chamomile!deberg] ps alx | grep nfsd
ps: warning: /var/run/dev.db: No such file or directory
    0  236    1  29   2   0    68   536 netcon   Is   ?? 0:00.01 nfsd: master 
    0  252  236   0  -5   0    48   428 fsync_ra DL   ?? 3:31.66 nfsd: server 
    0  253  236   1  -2   0    48   428 vnlock   DL   ?? 0:06.90 nfsd: server 
    0  254  236   0  -2   0    48   428 vnlock   DL   ?? 0:01.01 nfsd: server 
    0  255  236   0  -2   0    48   428 vnlock   DL   ?? 0:00.41 nfsd: server 
19890 8307 7587   0  28   0   540  1152 -        RV   ?? 0:00.00 grep nfsd (tcs

and on a client that has a hung process doing ls on the mountpoint:

nonantum-road# ps alx | grep ls
    0 26682 26674   0  -1  0  352  88 nfsrcvlk D    p4 0:00.01 ls /home 
    0 26699 26674   0  28  0  548 152 -        RV   p4 0:00.00 grep ls (csh)

getting a stack trace of an nfsd on the server is hard, because it's the
important machine, but it looks something like this:

bpendtsleep
lockmgr
genfs_lock
vn_lock
vget
ufs_ihashget
ffs_vget
ufs_fhtovp
ffs_fhtovp
nfsrv_fhtovp
nfsrv_commit
nfssvc_nfsd
sys_nfssvc

any idea what's going on?  i'll leave the machine in this state for
awhile in case there's more useful information i can get.

matt