2.6.21.14 NFS related oops

[Maciej Soltysiak <solt2@dns.toxicfilms.tv>]

Hi,

If anyone is interested I got this OOPS while running a torrent 
(btdownloadcurses)
application writing directly to a NAS mounted via nfs3.

The client machine is 2.6.21.14 and it is mounted with options:
wsize=8192,rsize=8192,hard,intr,tcp

After that, the application hung and i am unable to cd into the mounted 
nfs directory
nor unmount it (busy), nor kill the app (kill -9 fails, process in D state)

Best regards,
Maciej

BUG: unable to handle kernel paging request at virtual address 5018f248
printing eip:
f0a93c94
*pde = 00000000
Oops: 0002 [#1]
Modules linked in: binfmt_misc sit nfs lockd nfs_acl sunrpc w83627ehf 
i2c_isa i2c_viapro i2c_core via_agp agpgart rtc
CPU:    0
EIP:    0060:[<f0a93c94>]    Not tainted VLI
EFLAGS: 00010206   (2.6.20.14-cks1 #15)
EIP is at rpcauth_checkverf+0x34/0x70 [sunrpc]
eax: d2f4447c   ebx: c655d584   ecx: 00000000   edx: f0aa9f60
esi: e91ea640   edi: d2f44474   ebp: ede2f228   esp: e64b5eec
ds: 007b   es: 007b   ss: 0068
Process rpciod/0 (pid: 1005, ti=e64b4000 task=efe95a90 task.ti=e64b4000)
Stack: 00000286 ede2f8a0 ede2f8a0 00000286 c655d584 121d0da3 00000820 
f0a8d7fd
      f0a93d60 f08bae07 00000286 c655d5cc 00000286 00000286 f08c0520 
c655d584
      00000000 c655d5ec f0a93260 f0a9306f efe95a90 ee2d5740 e092ffb0 
c034e11c
Call Trace:
[<f0a8d7fd>] call_decode+0x27d/0x5e0 [sunrpc]
[<f0a93d60>] rpcauth_unbindcred+0x20/0x60 [sunrpc]
[<f08bae07>] nfs_readpage_result_full+0xf7/0x120 [nfs]
[<f08c0520>] nfs3_xdr_readres+0x0/0x160 [nfs]
[<f0a93260>] rpc_async_schedule+0x0/0x10 [sunrpc]
[<f0a9306f>] __rpc_execute+0x5f/0x250 [sunrpc]
[<c034e11c>] schedule+0x21c/0x450
[<c01283aa>] run_workqueue+0x7a/0x110
[<c0128a07>] worker_thread+0x137/0x160
[<c01176b0>] default_wake_function+0x0/0x10
[<c01288d0>] worker_thread+0x0/0x160
[<c012b329>] kthread+0xa9/0xe0
[<c012b280>] kthread+0x0/0xe0
[<c0103a97>] kernel_thread_helper+0x7/0x10
=======================
Code: 10 89 5c 24 10 89 c3 89 7c 24 18 89 d7 89 74 24 14 8b 70 28 75 1a 8b
4e 08 89 fa 89 d8 ff 51 18 8b 5c 24 10 83 74 24 14 8b 7c 24 <18> 83 c4 1c c3
89 74 24 0c 8b 40 10 8b 40 24 8b 40 10 8b 40 08 EIP: [<f0a93c94>]
rpcauth_checkverf+0x34/0x70 [sunrpc] SS:ESP 0068:e64b5eec

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