nfs locking up system: rpc-srv/tcp: nfsd: got error -104

[Bob Kryger <bobk@panix.com>]

Can someone explain the error and possibly give me a hint as to how to 
move forward...

Thanks
Bob

Installed a new FC6 system:

[root@nfs3 log]# uname -a
Linux nfs3 2.6.18-1.2798.fc6 #1 SMP Mon Oct 16 14:37:32 EDT 2006 i686 i686 i386 GNU/Linux

The system is not stable - it locks up after the following message 
occurs (here are two occurances).

May  8 10:31:48 nfs3 kernel: rpc-srv/tcp: nfsd: got error -104 when sending 140 bytes - shutting down socket
May  9 18:20:32 nfs3 kernel: rpc-srv/tcp: nfsd: got error -104 when sending 132 bytes - shutting down socket

It seems to happen every day or so, but the system is not yet in 
production, so there is very little if and any traffic on it.  I had 
originally though this had something to do with using 
rsize=8192,wsize=8192 on a client, while testing, but wonder if that may 
just have accelerated the issue, as it has now happened when  there is a 
mount without such specs, and very little traffic (overnight).

There are no other error messages occurring with this one. (Is this even 
a NFS error, or possibly portmapper?)

Hardware:

BIOS Information
        Vendor: Phoenix Technologies LTD
        Version: 6.00
        Release Date: 10/30/2006

Base Board Information
        Manufacturer: Supermicro
        Product Name: PDSMi
Processor Information
        Socket Designation: LGA775/U1
        Type: Central Processor
        Family: <OUT OF SPEC>
        Manufacturer: Intel
        ID: 49 0F 00 00 FF FB EB BF
        Version: Intel(R) Celeron(R) D CPU 2.80GHz

e1000: eth1: e1000_probe: Intel(R) PRO/1000 Network Connection
e1000: eth0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex

QLogic Fibre Channel HBA Driver
ACPI: PCI Interrupt 0000:00:1f.3[B] -> GSI 19 (level, low) -> IRQ 233
ACPI: PCI Interrupt 0000:0a:01.0[A] -> GSI 24 (level, low) -> IRQ 58
qla2xxx 0000:0a:01.0: Found an ISP2300, irq 58, iobase 0xf8882000
qla2xxx 0000:0a:01.0: Configuring PCI space...
qla2xxx 0000:0a:01.0: Configure NVRAM parameters...
qla2xxx 0000:0a:01.0: Verifying loaded RISC code...
qla2xxx 0000:0a:01.0: Allocated (412 KB) for firmware dump...
qla2xxx 0000:0a:01.0: Waiting for LIP to complete...
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
qla2xxx 0000:0a:01.0: LIP reset occured (f8f7).
qla2xxx 0000:0a:01.0: LIP occured (f8f7).
qla2xxx 0000:0a:01.0: LOOP UP detected (1 Gbps).
qla2xxx 0000:0a:01.0: Topology - (Loop), Host Loop address 0x8
scsi1 : qla2xxx
qla2xxx 0000:0a:01.0:
 QLogic Fibre Channel HBA Driver: 8.01.07-k1
  QLogic QLA2310 -
  ISP2300: PCI-X (66 MHz) @ 0000:0a:01.0 hdma-, host#=1, fw=3.03.20 IPX

There are 8 disks like this one on the Qlogic which are set up in an md 
array and exported via NFS3

sd 1:0:0:0: Attached scsi disk sda
  Vendor: SEAGATE   Model: ST1181677FC       Rev: 0001
  Type:   Direct-Access                      ANSI SCSI revision: 03



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