kernel oops

Dear Linux Managers,

One of a 64 cluster machines failed several times to particapte in
runing a job, running 4 cpuburn process, and writing to disk at the
same time for a couple of hours did not show any problems with the
machine, memtest does not show problems too with memory, and netpipe
integrity checks reports normal

the message shows kernel paging, and ip_transfer, is that an NFS
transcation, is it a swap issue, or is it a network issue.

the logs shows the following :
Jan 10 15:25:07 xrda021 kernel: Unable to handle kernel paging request
at virtual address 22bab394
Jan 10 15:25:07 x021 kernel:  printing eip:
Jan 10 15:25:07 x021 kernel: c013db1e
Jan 10 15:25:07 x021 kernel: *pde = 00000000
Jan 10 15:25:07 x021 kernel: Oops: 0000
Jan 10 15:25:07 x021 kernel: nfs lockd sunrpc bcm5700 mousedev keybdev
hid input usb-ohci usbcore ext3 jbd cciss sd_mod scsi_mod
Jan 10 15:25:07 x021 kernel: CPU:    1
Jan 10 15:25:07 x021 kernel: EIP:    0010:[<c013db1e>]    Not tainted
Jan 10 15:25:07 x021 kernel: EFLAGS: 00010002
Jan 10 15:25:07 x021 kernel:
Jan 10 15:25:07 x021 kernel: EIP is at kmem_cache_alloc_batch [kernel]
0x4e (2.4.20-18.8smp)
Jan 10 15:25:07 x021 kernel: eax: 11df11df   ebx: 11df11df   ecx:
db3e6c00   edx: 00000800
Jan 10 15:25:07 x021 kernel: esi: 00000000   edi: 0000001d   ebp:
c46cabf0   esp: f6f51c90
Jan 10 15:25:07 x021 kernel: ds: 0018   es: 0018   ss: 0018
Jan 10 15:25:07 x021 kernel: Process rpciod (pid: 722, stackpage=f6f51000)
Jan 10 15:25:07 x021 kernel: Stack: c46cabf8 c46cac00 c46cabf0
00000246 000001f0 000005dc c013e85b c46cabf0
Jan 10 15:25:07 x021 kernel:        f7fb1d80 000001f0 f6a0e180
00000000 000001f0 000005dc c0204014 c46cabf0
Jan 10 15:25:07 x021 kernel:        000001f0 f75d3980 00000014
f6a0ed80 c0202eb2 00000600 000001f0 00000000
Jan 10 15:25:07 x021 kernel: Call Trace:   [<c013e85b>]
__kmem_cache_alloc [kernel] 0x5b (0xf6f51ca8))
Jan 10 15:25:07 x021 kernel: [<c0204014>] alloc_skb [kernel] 0xc4 (0xf6f51cc8))
Jan 10 15:25:07 x021 kernel: [<c0202eb2>] sock_wmalloc [kernel] 0x32
(0xf6f51ce0))
Jan 10 15:25:07 x021 kernel: [<c0224bbe>] ip_build_xmit_slow [kernel]
0x52e (0xf6f51cf0))
Jan 10 15:25:07 x021 kernel: [<c0225822>] ip_finish_output2 [kernel]
0xa2 (0xf6f51d0c))

and the screen output at that time shows the following :

Jan 10 15:25:07 xrda021 kernel: Unable to handle kernel paging request
at virtual address 22bab394
Jan 10 15:25:07 xrda021 kernel:  printing eip:
Jan 10 15:25:07 xrda021 kernel: c013db1e
Jan 10 15:25:07 xrda021 kernel: *pde = 00000000
Jan 10 15:25:07 xrda021 kernel: Oops: 0000
Jan 10 15:25:07 xrda021 kernel: nfs lockd sunrpc bcm5700 mousedev
keybdev hid input usb-ohci usbcore ext3 jbd cciss sd_mod scsi_mod
Jan 10 15:25:07 xrda021 kernel: CPU:    1
Jan 10 15:25:07 xrda021 kernel: EIP:    0010:[<c013db1e>]    Not tainted
Jan 10 15:25:07 xrda021 kernel: EFLAGS: 00010002
Jan 10 15:25:07 xrda021 kernel:
Jan 10 15:25:07 xrda021 kernel: EIP is at kmem_cache_alloc_batch
[kernel] 0x4e (2.4.20-18.8smp)
Jan 10 15:25:07 xrda021 kernel: eax: 11df11df   ebx: 11df11df   ecx:
db3e6c00   edx: 00000800
Jan 10 15:25:07 xrda021 kernel: esi: 00000000   edi: 0000001d   ebp:
c46cabf0   esp: f6f51c90
Jan 10 15:25:07 xrda021 kernel: ds: 0018   es: 0018   ss: 0018
Jan 10 15:25:07 xrda021 kernel: Process rpciod (pid: 722, stackpage=f6f51000)
Jan 10 15:25:07 xrda021 kernel: Stack: c46cabf8 c46cac00 c46cabf0
00000246 000001f0 000005dc c013e85b c46cabf0
Jan 10 15:25:07 xrda021 kernel:        f7fb1d80 000001f0 f6a0e180
00000000 000001f0 000005dc c0204014 c46cabf0
Jan 10 15:25:07 xrda021 kernel:        000001f0 f75d3980 00000014
f6a0ed80 c0202eb2 00000600 000001f0 00000000
Jan 10 15:25:07 xrda021 kernel: Call Trace:   [<c013e85b>]
__kmem_cache_alloc [kernel] 0x5b (0xf6f51ca8))
Jan 10 15:25:07 xrda021 kernel: [<c0204014>] alloc_skb [kernel] 0xc4
(0xf6f51cc8))
Jan 10 15:25:07 xrda021 kernel: [<c0202eb2>] sock_wmalloc [kernel]
0x32 (0xf6f51ce0))
Jan 10 15:25:07 xrda021 kernel: [<c0224bbe>] ip_build_xmit_slow
[kernel] 0x52e (0xf6f51cf0))
Jan 10 15:25:07 xrda021 kernel: [<c0225822>] ip_finish_output2
[kernel] 0xa2 (0xf6f51d0c))

Thanks in advance

linux user
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