备份时内核出错Unable to handle kernel NULL pointer dereference at virtual address

备份十几万图片文件时碰到内核出错，reboot等命令也无法重启。

重启后再试还是出错。

<coolcode>

SELinux: initialized (dev rpc_pipefs, type rpc_pipefs), uses genfs_contexts
Losing some ticks… checking if CPU frequency changed.
Unable to handle kernel NULL pointer dereference at virtual address 000000f8
 printing eip:
c02c4ecb
*pde = 00004001
Oops: 0000 [#1]
SMP
Modules linked in: autofs4 sunrpc ipt_state iptable_filter iptable_nat ip_conntrack iptable_mangle ip_tables dm_mod button battery ac uhci_hcd ehci_hcd tg3 floppy ext3 jbd ata_piix libata aic79xx sd_mod scsi_mod
CPU:    1
EIP:    0060:[<c02c4ecb>]    Not tainted VLI
EFLAGS: 00010046   (2.6.9-5.ELsmp)
EIP is at _spin_lock_irqsave+0x7/0x45
eax: 000000f4   ebx: 00000246   ecx: c2024d60   edx: 00000200
esi: 000000f4   edi: 00000283   ebp: f7fecf68   esp: f7fecf50
ds: 007b   es: 007b   ss: 0068
Process khelper (pid: 14, threadinfo=f7fec000 task=f7f67230)
Stack: 000000f0 000000f4 c011cfa7 e191be40 e191be44 00000283 f7eb2000 c012e837
       e191be80 c012e498 ffffffff ffffffff 00000001 00000000 c011ce93 00010000
       00000000 c0400e20 c201cd60 00000000 00000000 f7f67230 c011ce93 00100100
Call Trace:
 [<c011cfa7>] complete+0x12/0x3d
 [<c012e837>] worker_thread+0x168/0x1d5
 [<c012e498>] __call_usermodehelper+0x0/0x41
 [<c011ce93>] default_wake_function+0x0/0xc
 [<c011ce93>] default_wake_function+0x0/0xc
 [<c012e6cf>] worker_thread+0x0/0x1d5
 [<c0131dcd>] kthread+0x73/0x9b
 [<c0131d5a>] kthread+0x0/0x9b
 [<c01041f1>] kernel_thread_helper+0x5/0xb
Code: 6c 00 6c 74 2d c0 0f b6 02 84 c0 7e 08 0f 0b 6d 00 6c 74 2d c0 86 0a c3 f0 81 00 00 00 00 01 c3 f0 ff 00 c3 56 89 c6 53 9c 5b fa <81> 78 04 ad 4e ad de 74 18 ff 74 24 08 68 5f 83 2d c0 e8 24 bd
</coolcode>