CentOs系统被无缘无故重启了，查不到原因

青鸟不勤

系统被无缘无故重启，不知道什么原因。
last reboot信息：
reboot   system boot  2.6.18-164.el5   Tue Jul 22 16:28          (20:40)

cat /var/log/messages信息
Jul 20 04:02:01 UAT5-2 syslogd 1.4.1: restart.
Jul 22 16:28:25 UAT5-2 syslogd 1.4.1: restart.
Jul 22 16:28:25 UAT5-2 kernel: klogd 1.4.1, log source = /proc/kmsg started.
Jul 22 16:28:25 UAT5-2 kernel: Linux version 2.6.18-164.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)) #1 SMP Thu Sep 3 03:28:30
EDT 2009
Jul 22 16:28:25 UAT5-2 kernel: Command line: ro root=/dev/vg00/lv_root00
Jul 22 16:28:25 UAT5-2 kernel: BIOS-provided physical RAM map:
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 0000000000010000 - 000000000009f800 (usable)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 00000000000ca000 - 00000000000cc000 (reserved)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 00000000000dc000 - 0000000000100000 (reserved)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 0000000000100000 - 00000000bfef0000 (usable)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 00000000bfef0000 - 00000000bfeff000 (ACPI data)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 00000000bfeff000 - 00000000bff00000 (ACPI NVS)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 00000000bff00000 - 00000000c0000000 (usable)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 00000000f0000000 - 00000000f8000000 (reserved)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 00000000fffe0000 - 0000000100000000 (reserved)
Jul 22 16:28:25 UAT5-2 kernel:  BIOS-e820: 0000000100000000 - 0000000234000000 (usable)
Jul 22 16:28:25 UAT5-2 kernel: DMI present.
Jul 22 16:28:25 UAT5-2 kernel: SRAT: PXM 0 -> APIC 0 -> Node 0
Jul 22 16:28:25 UAT5-2 kernel: SRAT: PXM 0 -> APIC 1 -> Node 0
Jul 22 16:28:25 UAT5-2 kernel: SRAT: PXM 0 -> APIC 2 -> Node 0
Jul 22 16:28:25 UAT5-2 kernel: SRAT: PXM 0 -> APIC 3 -> Node 0
Jul 22 16:28:25 UAT5-2 kernel: SRAT: Node 0 PXM 0 0-a0000
Jul 22 16:28:25 UAT5-2 kernel: SRAT: Node 0 PXM 0 0-10000000
Jul 22 16:28:25 UAT5-2 kernel: SRAT: Node 0 PXM 0 0-c0000000
Jul 22 16:28:25 UAT5-2 kernel: SRAT: Node 0 PXM 0 0-234000000
Jul 22 16:28:25 UAT5-2 kernel: Bootmem setup node 0 0000000000000000-0000000234000000
Jul 22 16:28:25 UAT5-2 kernel: Memory for crash kernel (0x0 to 0x0) notwithin permissible range
Jul 22 16:28:25 UAT5-2 kernel: disabling kdump
Jul 22 16:28:25 UAT5-2 kernel: ACPI: PM-Timer IO Port: 0x1008
Jul 22 16:28:25 UAT5-2 kernel: ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)

cryboy2001

多注意观察，看看是不是cpu或硬件温度造成的。

青鸟不勤

最后last后看到，在普通用户的记录上有crash的状态，应该是操作不当，导致的系统崩溃自动重启了。

cryboy2001

During the boot process you may see the message "Memory for crash kernel (0x0 to 0x0) notwithin permissible range" appear. This message comes from the new kdump infrastructure. It is a harmless message and can be safely ignored

这个是 disabling kdump造成的，对系统没什么影响！