processes stuck in....?

Hi,

I'd like to get some feedback on a problem that freezes SMP clients so hard
that a) even when a monitor is plugged, there is no display (no control from keyboard either)
b) no terminal console access via serial port c) even nmi_watchdog can't get out of it apparently (no report) This happens usually in a pretty consistently when the nfs client creates a lot of files (like 800+) or write big file. I don't have any tcpdump or something else for now.
Any idea/suggestion (change mount options?)
Thanks for any help or feedback

JC

Client: Precision 530 Dual 1.7GhZ Xeon with Syskonnect SK9D21 GigE, Redhat 7.2, kernel 2.4.21-rc1, nfs-utils-1.0.3-1 with ext2 file

# rpcinfo -p
   program vers proto   port
    100000    2   tcp    111  portmapper
    100000    2   udp    111  portmapper
    100021    1   udp  32768  nlockmgr
    100021    3   udp  32768  nlockmgr
    100021    4   udp  32768  nlockmgr
    100024    1   udp    904  status
    100024    1   tcp    907  status
The directory are mounted with option:
10.0.0.10:/export/data  /opt/data       nfs rw,nosuid,nodev,hard,intr,bg,rsize=8192,wsize=8192 0 0

Excerpt from /var/log/messages:

May  6 13:59:27 bob1 kernel: sk9dlin: Network Device Driver v1.03
May  6 13:59:27 bob1 kernel: (C)Copyright 2001 SysKonnect GmbH.
May  6 13:59:27 bob1 kernel: eth0: SysKonnect SK-9D21 Gigabit Ethernet
May  6 13:59:27 bob1 kernel: eth0: network connection down
May  6 13:59:27 bob1 kernel: eth0: NIC Link is downeth0: network connection down
May  6 13:59:27 bob1 kernel: eth0: Network connection up using
May  6 13:59:27 bob1 kernel:       speed        = 1000 Mbps
May  6 13:59:27 bob1 kernel:       duplex mode  = full
May  6 13:59:27 bob1 kernel:       card         = copper
May  6 13:59:27 bob1 kernel:       flowctrl     = none
May  6 13:59:27 bob1 kernel:       autoneg      = no
.....
May  6 13:59:24 bob1 sysctl: net.ipv4.ip_forward = 0
May  6 13:59:24 bob1 sysctl: net.ipv4.conf.default.rp_filter = 1
May  6 13:59:24 bob1 sysctl: kernel.sysrq = 0
May  6 13:59:24 bob1 sysctl: kernel.shmall = 33554432
May  6 13:59:24 bob1 sysctl: kernel.shmmax = 536870912
May  6 13:59:24 bob1 sysctl: net.ipv4.tcp_fin_timeout = 30
May  6 13:59:24 bob1 sysctl: net.ipv4.tcp_keepalive_time = 1800
May  6 13:59:24 bob1 sysctl: net.ipv4.tcp_window_scaling = 0
May  6 13:59:24 bob1 sysctl: net.ipv4.tcp_sack = 0
May  6 13:59:24 bob1 sysctl: net.ipv4.tcp_timestamps = 0
May  6 13:59:24 bob1 sysctl: net.ipv4.ip_no_pmtu_disc = 1
May  6 13:59:24 bob1 sysctl: net.core.rmem_max = 262143
May  6 13:59:24 bob1 sysctl: net.core.rmem_default = 262143
May  6 13:59:24 bob1 sysctl: net.core.wmem_max = 262143
.....
May  6 13:59:34 bob1 rpc.lockd: lockdsvc: Function not implemented
May  6 13:59:34 bob1 nfslock: rpc.lockd startup failed
May  6 13:59:34 bob1 rpc.statd[724]: Version 1.0.3 Starting
May  6 13:59:34 bob1 nfslock: rpc.statd startup succeeded

-----------------------------
Server: 530 Dual 1.7GhZ Xeon with Syskonnect SK9D21 GigE, Redhat 7.2, kernel 2.4.21-rc1, nfs-utils-1.0.3-1 with ext3 on a raid5

# rpcinfo -p
   program vers proto   port
    100000    2   tcp    111  portmapper
    100000    2   udp    111  portmapper
    100011    1   udp    696  rquotad
    100011    2   udp    696  rquotad
    100011    1   tcp    699  rquotad
    100011    2   tcp    699  rquotad
    100003    2   udp   2049  nfs
    100003    3   udp   2049  nfs
    100021    1   udp  32768  nlockmgr
    100021    3   udp  32768  nlockmgr
    100021    4   udp  32768  nlockmgr
    100005    1   udp    732  mountd
    100005    1   tcp    735  mountd
    100005    2   udp    732  mountd
    100005    2   tcp    735  mountd
    100005    3   udp    732  mountd
    100005    3   tcp    735  mountd
    100024    1   udp    757  status
    100024    1   tcp    760  status
# cat /etc/exports
/export/data 10.0.3.0/8(rw) 10.0.0.1(rw)

Excerpt From /var/log/messages:

May  5 21:24:44 file1 exportfs[938]: /etc/exports [4]: No 'sync' or 'async' option specified for export "10.0.0.1:/export/data".   Assuming default behaviour ('sync').   NOTE: this default has changed from previous versions
May  5 21:24:44 file1 nfs: Starting NFS services:  succeeded
May  5 21:24:45 file1 nfs: rpc.rquotad startup succeeded
May  5 21:24:45 file1 nfs: rpc.nfsd startup succeeded
May  5 21:24:45 file1 nfs: rpc.mountd startup succeeded
May  5 21:24:45 file1 nfslock: rpc.lockd startup succeeded
May  5 21:24:45 file1 rpc.statd[1001]: Version 1.0.3 Starting
May  5 21:24:45 file1 nfslock: rpc.statd startup succeeded

The exported directory is on a Promise Ultratrak100 TX8 connected to a Tekram 390U3W.

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