Oops in kernel 2.6.21

["Stefan Helbing" <sth@wecltd.eu>]

Hello,

I'm really unsure if you can help me with this problem, so I choosed this address from oops-tracing.txt.
I get an Oops in kernel 2.6.21 very often. One of the Oops logs is attached to this email.
I believe (but I only believe - because until now the system is not doing more than this) that the Oops occurs during longer NFS transfers over a WAN connection.
I took the source code from the current Debian unstable version.

Do you have a suggestion? More information necessary?
Thank you very much!

Best regards
Stefan Helbing

May 27 10:24:49 kassandra kernel: BUG: unable to handle kernel paging request at virtual address 00b00000
May 27 10:24:49 kassandra kernel:  printing eip:
May 27 10:24:49 kassandra kernel: c015d5ce
May 27 10:24:49 kassandra kernel: *pde = 2aebf001
May 27 10:24:49 kassandra kernel: *pte = 00000000
May 27 10:24:49 kassandra kernel: Oops: 0000 [#1]
May 27 10:24:49 kassandra kernel: SMP
May 27 10:24:49 kassandra kernel: Modules linked in: ipt_REJECT ipt_LOG xt_limit xt_tcpudp iptable_filter ip_tables x_tables it87 hwmon_vid hwmon i2c_isa i2c_dev nfsd exportfs nfs lockd sunrpc i2c_i801 3c59x unix
May 27 10:24:49 kassandra kernel: CPU:    0
May 27 10:24:49 kassandra kernel: EIP:    0060:[__d_lookup+97/244]    Not tainted VLI
May 27 10:24:49 kassandra kernel: EFLAGS: 00010206   (2.6.21-i386 #1)
May 27 10:24:49 kassandra kernel: EIP is at __d_lookup+0x61/0xf4
May 27 10:24:49 kassandra kernel: eax: 000126d5   ebx: 00003354   ecx: 00000011   edx: c36a6120
May 27 10:24:49 kassandra kernel: esi: dde75d48   edi: cb71a194   ebp: 00b00000   esp: dde75cdc
May 27 10:24:49 kassandra kernel: ds: 007b   es: 007b   fs: 00d8  gs: 0033  ss: 0068
May 27 10:24:49 kassandra kernel: Process cp (pid: 5465, ti=dde74000 task=ec2a5070 task.ti=dde74000)
May 27 10:24:49 kassandra kernel: Stack: 00000000 ffcaa7dc b93cff31 00000027 dde75d48 cb71a194 00003354 dde75d48
May 27 10:24:49 kassandra kernel:        cb71a194 dde75f00 c015d54c ffcaa803 00000000 b93cff31 f8e5477a f8e60f35
May 27 10:24:49 kassandra kernel:        00000000 00000001 cb71a194 0007b847 dde75f00 d8b52e9c dde75f30 00000000
May 27 10:24:49 kassandra kernel: Call Trace:
May 27 10:24:49 kassandra kernel:  [d_lookup+28/61] d_lookup+0x1c/0x3d
May 27 10:24:49 kassandra kernel:  [pg0+950245242/1069429760] nfs_readdir_lookup+0xfc/0x2ca [nfs]
May 27 10:24:49 kassandra kernel:  [pg0+950296373/1069429760] nfs3_decode_dirent+0xe0/0x190 [nfs]
May 27 10:24:49 kassandra kernel:  [pg0+950241074/1069429760] nfs_do_filldir+0x70/0x187 [nfs]
May 27 10:24:49 kassandra kernel:  [filldir64+0/234] filldir64+0x0/0xea
May 27 10:24:49 kassandra kernel:  [pg0+950243017/1069429760] nfs_readdir+0x680/0x6d9 [nfs]
May 27 10:24:49 kassandra kernel:  [do_lookup+69/157] do_lookup+0x45/0x9d
May 27 10:24:49 kassandra kernel:  [filldir64+0/234] filldir64+0x0/0xea
May 27 10:24:49 kassandra kernel:  [pg0+949935784/1069429760] rpcauth_lookup_credcache+0x85/0x1af [sunrpc]
May 27 10:24:49 kassandra kernel:  [alloc_super+173/304] alloc_super+0xad/0x130
May 27 10:24:49 kassandra kernel:  [pg0+950256250/1069429760] nfs_file_set_open_context+0x1f/0x3d [nfs]
May 27 10:24:49 kassandra kernel:  [pg0+950256580/1069429760] nfs_open+0x5d/0x63 [nfs]
May 27 10:24:49 kassandra kernel:  [copy_to_user+47/55] copy_to_user+0x2f/0x37
May 27 10:24:49 kassandra kernel:  [cp_new_stat64+246/267] cp_new_stat64+0xf6/0x10b
May 27 10:24:49 kassandra kernel:  [pg0+950296149/1069429760] nfs3_decode_dirent+0x0/0x190 [nfs]
May 27 10:24:49 kassandra kernel:  [sys_fstat64+30/35] sys_fstat64+0x1e/0x23
May 27 10:24:49 kassandra kernel:  [filldir64+0/234] filldir64+0x0/0xea
May 27 10:24:49 kassandra kernel:  [vfs_readdir+71/106] vfs_readdir+0x47/0x6a
May 27 10:24:49 kassandra kernel:  [sys_getdents64+103/174] sys_getdents64+0x67/0xae
May 27 10:24:49 kassandra kernel:  [syscall_call+7/11] syscall_call+0x7/0xb
May 27 10:24:49 kassandra kernel:  =======================
May 27 10:24:49 kassandra kernel: Code: 01 c8 8b 0d 80 67 3b c0 89 c2 81 f2 01 00 37 9e d3 ea 31 d0 8b 15 84 67 3b c0 23 05 7c 67 3b c0 8b 2c 82 85 ed 0f 84 88 00 00 00 <8b> 45 00 0f 18 00 90 8b 4c 24 08 8d 5d f0 39 4b 1c 75 6a 8b 44
May 27 10:24:49 kassandra kernel: EIP: [__d_lookup+97/244] __d_lookup+0x61/0xf4 SS:ESP 0068:dde75cdc