系统重启原因求教

satanaelzhou

使用的内核是2.6.25.工作大概12小时左右，就会重启一次。从串口输出没有任何有用的信息，除了一个问号，估计就是个乱码.
下面是重启后，查看的/var/log下的几个文件，提供些分析的手段或者思路就好了。谢谢！
[root@ITL log]cat messages
Jan  1 00:00:03 ITL syslog.info syslogd started: BusyBox v1.1.3
Jan  1 00:00:03 ITL user.notice kernel: klogd started: BusyBox v1.1.3 (2008.06.23-08:26+0000)
Jan  1 00:00:03 ITL user.info kernel: Using Freescale MPC8272 ADS machine description
Jan  1 00:00:03 ITL user.notice kernel: Linux version 2.6.25 (root@localhost.localdomain) (gcc version 4.2.1 (Sourcery G++ Lite 4.2-82)) #8 Tue Nov 2 09:25:27 CST 2010
Jan  1 00:00:03 ITL user.debug kernel: Entering add_active_range(0, 0, 3276 0 entries of 256 used
Jan  1 00:00:03 ITL user.debug kernel: Top of RAM: 0x8000000, Total RAM: 0x8000000
Jan  1 00:00:03 ITL user.debug kernel: Memory hole size: 0MB
Jan  1 00:00:03 ITL user.warn kernel: Zone PFN ranges:
Jan  1 00:00:03 ITL user.warn kernel:   DMA             0 ->    32768
Jan  1 00:00:03 ITL user.warn kernel:   Normal      32768 ->    32768
Jan  1 00:00:03 ITL user.warn kernel: Movable zone start PFN for each node
Jan  1 00:00:03 ITL user.warn kernel: early_node_map[1] active PFN ranges
Jan  1 00:00:03 ITL user.warn kernel:     0:        0 ->    32768
Jan  1 00:00:03 ITL user.debug kernel: On node 0 totalpages: 32768
Jan  1 00:00:03 ITL user.debug kernel:   DMA zone: 256 pages used for memmap
Jan  1 00:00:03 ITL user.debug kernel:   DMA zone: 0 pages reserved
Jan  1 00:00:03 ITL user.debug kernel:   DMA zone: 32512 pages, LIFO batch:7
Jan  1 00:00:03 ITL user.debug kernel:   Normal zone: 0 pages used for memmap
Jan  1 00:00:03 ITL user.debug kernel:   Movable zone: 0 pages used for memmap
Jan  1 00:00:03 ITL user.warn kernel: Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 32512
Jan  1 00:00:03 ITL user.notice kernel: Kernel command line: root=/dev/mtdblock1 rw rootfstype=cramfs console=ttyCPM0,115200
Jan  1 00:00:03 ITL user.err kernel: No pci pic node in device tree.
Jan  1 00:00:03 ITL user.warn kernel: PID hash table entries: 512 (order: 9, 2048 bytes)
Jan  1 00:00:03 ITL user.debug kernel: time_init: decrementer frequency = 16.500000 MHz
Jan  1 00:00:03 ITL user.debug kernel: time_init: processor frequency   = 396.000000 MHz
Jan  1 00:00:03 ITL user.info kernel: clocksource: timebase mult[f26c9b2] shift[22] registered
Jan  1 00:00:03 ITL user.debug kernel: clockevent: decrementer mult[439] shift[16] cpu[0]
Jan  1 00:00:03 ITL user.warn kernel: cpm_uart_allocbuf 40 fdfb6040 fdfb47fcsetbrg 6 115200
Jan  1 00:00:03 ITL user.info kernel: console [ttyCPM0] enabled
Jan  1 00:00:03 ITL user.info kernel: Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Jan  1 00:00:03 ITL user.info kernel: Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Jan  1 00:00:03 ITL user.info kernel: Memory: 126632k/131072k available (2884k kernel code, 4284k reserved, 100k data, 117k bss, 144k init)
Jan  1 00:00:03 ITL user.info kernel: SLUB: Genslabs=12, HWalign=32, Order=0-1, MinObjects=4, CPUs=1, Nodes=1
Jan  1 00:00:03 ITL user.debug kernel: Calibrating delay loop... 32.89 BogoMIPS (lpj=65792)
Jan  1 00:00:03 ITL user.warn kernel: Mount-cache hash table entries: 512
Jan  1 00:00:03 ITL user.info kernel: net_namespace: 152 bytes
Jan  1 00:00:03 ITL user.info kernel: NET: Registered protocol family 16
Jan  1 00:00:03 ITL user.info kernel: PCI: Probing PCI hardware
Jan  1 00:00:03 ITL user.notice kernel: SCSI subsystem initialized
Jan  1 00:00:03 ITL user.debug kernel: Switched to high resolution mode on CPU 0
Jan  1 00:00:03 ITL user.info kernel: NET: Registered protocol family 2
Jan  1 00:00:03 ITL user.info kernel: IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
Jan  1 00:00:03 ITL user.info kernel: TCP established hash table entries: 4096 (order: 3, 32768 bytes)
Jan  1 00:00:03 ITL user.info kernel: TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
Jan  1 00:00:03 ITL user.info kernel: TCP: Hash tables configured (established 4096 bind 4096)
Jan  1 00:00:03 ITL user.info kernel: TCP reno registered
Jan  1 00:00:03 ITL user.info kernel: JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
Jan  1 00:00:03 ITL user.info kernel: io scheduler noop registered
Jan  1 00:00:03 ITL user.info kernel: io scheduler anticipatory registered (default)
Jan  1 00:00:03 ITL user.info kernel: io scheduler deadline registered
Jan  1 00:00:03 ITL user.info kernel: io scheduler cfq registered
Jan  1 00:00:03 ITL user.info kernel: ttyCPM0 at MMIO 0xc905ca80 (irq =  is a CPM UART
Jan  1 00:00:03 ITL user.warn kernel: cpm_uart_allocbuf c0 fdfb60c0 c90628fc<6>ttyCPM1 at MMIO 0xc9060a90 (irq = 9) is a CPM UART
Jan  1 00:00:03 ITL user.info kernel: brd: module loaded
Jan  1 00:00:03 ITL user.info kernel: loop: module loaded
Jan  1 00:00:03 ITL user.info kernel: tun: Universal TUN/TAP device driver, 1.6
Jan  1 00:00:03 ITL user.info kernel: tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>
Jan  1 00:00:03 ITL user.warn kernel: network is testing by zdl ..................
Jan  1 00:00:03 ITL user.info kernel: eth0: fs_enet: 04:00:00:00:00:0a
Jan  1 00:00:03 ITL user.warn kernel: res.start = f0010d00
Jan  1 00:00:03 ITL user.warn kernel: mdio_pin  = 18
Jan  1 00:00:03 ITL user.warn kernel: mdc_pin  = 19
Jan  1 00:00:03 ITL user.warn kernel: phy id = 9
Jan  1 00:00:03 ITL user.warn kernel: phy irq = 0
Jan  1 00:00:03 ITL user.info kernel: CPM2 Bitbanged MII: probed
Jan  1 00:00:03 ITL user.warn kernel: fs_enet_mdio_probe
Jan  1 00:00:03 ITL user.info kernel: CPM2 Bitbanged MII: probed
Jan  1 00:00:03 ITL user.warn kernel: fs_enet_mdio_probe done
Jan  1 00:00:03 ITL user.warn kernel: Driver 'sd' needs updating - please use bus_type methods
Jan  1 00:00:03 ITL user.info kernel: ff000000.flash: Found 1 x16 devices at 0x0 in 8-bit bank
Jan  1 00:00:03 ITL user.warn kernel:  Intel/Sharp Extended Query Table at 0x0031
Jan  1 00:00:03 ITL user.info kernel: Using buffer write method
Jan  1 00:00:03 ITL user.notice kernel: cfi_cmdset_0001: Erase suspend on write enabled
Jan  1 00:00:03 ITL user.debug kernel: erase region 0: offset=0x0,size=0x20000,blocks=128
Jan  1 00:00:03 ITL user.notice kernel: cmdlinepart partition parsing not available
Jan  1 00:00:03 ITL user.notice kernel: RedBoot partition parsing not available
Jan  1 00:00:03 ITL user.notice kernel: Creating 7 MTD partitions on "ff000000.flash":
Jan  1 00:00:03 ITL user.notice kernel: 0x00000000-0x00200000 : "kernel"
Jan  1 00:00:03 ITL user.notice kernel: 0x00200000-0x00600000 : "rootfs"
Jan  1 00:00:03 ITL user.notice kernel: 0x00600000-0x00d80000 : "application"
Jan  1 00:00:03 ITL user.notice kernel: 0x00d80000-0x00f00000 : "config"
Jan  1 00:00:03 ITL user.notice kernel: 0x00f00000-0x00f80000 : "bootloader"
Jan  1 00:00:03 ITL user.notice kernel: 0x00f80000-0x00fa0000 : "dtb"
Jan  1 00:00:03 ITL user.notice kernel: 0x00fa0000-0x01000000 : "factory"
Jan  1 00:00:03 ITL user.info kernel: mice: PS/2 mouse device common for all mice
Jan  1 00:00:03 ITL user.info kernel: WDT driver for mpc82xx initialized. mode:reset timeout=65535 (2 seconds)
Jan  1 00:00:03 ITL user.info kernel: TCP cubic registered
Jan  1 00:00:03 ITL user.info kernel: NET: Registered protocol family 1
Jan  1 00:00:03 ITL user.info kernel: NET: Registered protocol family 17
Jan  1 00:00:03 ITL user.info kernel: RPC: Registered udp transport module.
Jan  1 00:00:03 ITL user.info kernel: RPC: Registered tcp transport module.
Jan  1 00:00:03 ITL user.warn kernel: VFS: Mounted root (cramfs filesystem) readonly.
Jan  1 00:00:03 ITL user.warn kernel: Freeing unused kernel memory: 144k init
Jan  1 00:00:03 ITL user.warn kernel: 0
Jan  1 00:00:03 ITL user.warn kernel: setbrg 6 115200
Jan  1 00:00:03 ITL user.warn kernel: setbrg 6 115200
Jan  1 00:00:09 ITL authpriv.warn dropbear[775]: Failed reading '/etc/dropbear/dropbear_dss_host_key', disabling DSS
Jan  1 00:00:09 ITL authpriv.info dropbear[775]: Running in background
Jan  1 00:00:09 ITL user.warn kernel: GPIO_init
Jan  1 00:00:13 ITL user.warn kernel: GPIO register
Jan  1 00:00:24 ITL daemon.info init: Starting pid 816, console /dev/console: '/sbin/getty'
Jan  1 00:06:10 ITL auth.info login[816]: root login  on `console'


[root@ITL log]cat lastlog
0consolesoleroot0consolesoleLOGIN0consolesoleroot[root@ITL log]

[root@ITL log]cat wtmp
0consolesoleroot0consolesoleLOGIN0consolesoleroot[root@ITL log]

satanaelzhou

各位大侠各显神通了，谢谢了。