Description of problem:
Unable to handle kernel NULL pointer dereference<1> at
0000000000000000 RIP: [<ffffffff802c5810>]{strlen+0}PML4 239eb067 PGD
24f44067 PMD 0
Oops: 0000
CPU 1
Pid: 18015, comm: spin1000f Not tainted
RIP: 0010:[<ffffffff802c5810>]{strlen+0}
RSP: 0000:0000010023a797c0  EFLAGS: 00010203
RAX: 0000000000000b00 RBX: 0000010023a79d00 RCX: 000001003b93bcf8
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000cf8 R08: 0000000000000040 R09: 0038004000000000
R10: 0000000000000011 R11: 0000000000000040 R12: 0000010023a79cb8
R13: 0000010023a79d38 R14: 00000000000003f8 R15: 0000010023a79ac8
FS:  0000002a9555ec20(0000) GS:ffffffff80574e40(0000)
knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 000000003ff66000 CR4: 00000000000006e0
Process spin1000f (pid: 18015, stackpage=10023a79000)
Stack: 0000010023a797c0 0000000000000000 ffffffff8018598c 0000000000000004
       ffffffff801865cc 0000000000000216 0000010023b02000 0000000000000000
       ffffffffa009084f 0000000000000000 0000010023b021f8 00000000251e0450
Call Trace: [<ffffffff8018598c>]{notesize+12}
[<ffffffff801865cc>]{elf_core_dump+2348}
       [<ffffffffa009084f>]{:sunrpc:__xprt_lock_write_next+79}
       [<ffffffffa009084f>]{:sunrpc:__xprt_lock_write_next+79}
       [<ffffffffa0093770>]{:sunrpc:xprt_clear_backlog+16}
       [<ffffffffa00930d4>]{:sunrpc:xprt_release+388}
[<ffffffff80121e00>]{thread_return+0}
       [<ffffffffa0093770>]{:sunrpc:xprt_clear_backlog+16}
       [<ffffffffa00930d4>]{:sunrpc:xprt_release+388}
[<ffffffffa0095531>]{:sunrpc:rpc_release_task_Rsmp_50e2ad44+625}
       [<ffffffffa0094cb5>]{:sunrpc:__rpc_execute+949}
[<ffffffffa008f62e>]{:sunrpc:rpc_call_sync_Rsmp_bf9321f4+174}
       [<ffffffff801438c3>]{truncate_inode_pages+179}
[<ffffffffa00d2b4d>]{:nfs:nfs_open+157}
       [<ffffffff801668ac>]{do_coredump+588}
[<ffffffff8013472d>]{__dequeue_signal+397}
       [<ffffffff80136b44>]{get_signal_to_deliver+1284}
[<ffffffff801b81f8>]{do_page_fault+1144}
       [<ffffffff80110191>]{do_signal+97}
[<ffffffff8015932d>]{filp_open+45}
       [<ffffffff80110c8b>]{error_signal_test+0}
 
Code: 80 3f 00 48 89 f8 74 08 48 ff c0 80 38 00 75 f8 48 29 f8 c3
RIP [<ffffffff802c5810>]{strlen+0} RSP <0000010023a797c0>
CR2: 0000000000000000


Afaict the system was doing nothing then issued this oops.
It's still running, appears to be running normally even now.

I'd be interested in knowing where this oops comes from though.

This is an arima hdama motherboard with 1 or 2gb of ram and 2 opteron
242 processors.

kernel is:
Linux lqcd09 2.4.22-1.2166.nptlsmp #1 SMP Fri Jan 30 13:37:28 EST 2004
x86_64 x86_64 x86_64 GNU/Linux

Thanks