系统：Centos6.8 64位 32GB内存
以下是messages及dmesg日志。
[root@CYCN-APSRV ~]# less /var/log/messages | grep -i error
May 27 07:59:20 CYCN-APSRV kernel: end_request: I/O error, dev xvda, sector 280590
May 27 07:59:20 CYCN-APSRV kernel: end_request: I/O error, dev xvda, sector 280590
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.460001] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.460991] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.461450] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.461775] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.462154] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.462531] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.462862] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.463213] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.463555] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.463870] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.464234] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.464573] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.464892] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.465183] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.465512] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.465858] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:43 CYCN-APSRV NetworkManager[1118]: <error> [1338076843.466170] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:00:46 CYCN-APSRV NetworkManager[1118]: <error> [1338076846.307131] [nm-manager.c:1313] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
May 27 08:06:55 CYCN-APSRV NetworkManager[1124]: <error> [1338077215.899852] [nm-device-ethernet.c:729] real_update_permanent_hw_address(): (eth0): unable to read permanent MAC address (error 0)
May 27 08:06:55 CYCN-APSRV NetworkManager[1124]: <warn> bluez error getting default adapter: The name org.bluez was not provided by any .service files
[root@CYCN-APSRV ~]# dmesg
Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Linux version 2.6.32-100.34.1.el6uek.x86_64 (mockbuild@ca-build44.us.oracle.com) (gcc version 4.4.4 20100726 (Red Hat 4.4.4-13) (GCC) ) #1 SMP Wed May 25 17:46:45 EDT 2011
Command line: ro root=/dev/mapper/vg_cycnapsrv-lv_root rd_LVM_LV=vg_cycnapsrv/lv_root rd_LVM_LV=vg_cycnapsrv/lv_swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=zh_CN.UTF-8 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet
KERNEL supported cpus:
Intel GenuineIntel
AMD AuthenticAMD
Centaur CentaurHauls
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000f0000000 (usable)
BIOS-e820: 00000000fc000000 - 0000000100000000 (reserved)
BIOS-e820: 0000000100000000 - 0000000410400000 (usable)
DMI 2.4 present.
last_pfn = 0x410400 max_arch_pfn = 0x400000000
MTRR default type: write-back
MTRR fixed ranges enabled:
00000-9FFFF write-back
A0000-BFFFF write-combining
C0000-FFFFF write-back
MTRR variable ranges enabled:
0 base 000F0000000 mask FFFF8000000 uncachable
1 base 000F8000000 mask FFFFC000000 uncachable
2 disabled
3 disabled
4 disabled
5 disabled
6 disabled
7 disabled
x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
last_pfn = 0xf0000 max_arch_pfn = 0x400000000
initial memory mapped : 0 - 20000000
init_memory_mapping: 0000000000000000-00000000f0000000
0000000000 - 00f0000000 page 2M
kernel direct mapping tables up to f0000000 @ 8000-d000
init_memory_mapping: 0000000100000000-0000000410400000
0100000000 - 0410400000 page 2M
kernel direct mapping tables up to 410400000 @ b000-1d000
RAMDISK: 37374000 - 37fef0ec
ACPI: RSDP 00000000000ea020 00024 (v02 Xen)
ACPI: XSDT 00000000fc012c90 00034 (v01 Xen HVM 00000000 HVML 00000000)
ACPI: FACP 00000000fc012ab0 000F4 (v04 Xen HVM 00000000 HVML 00000000)
ACPI: DSDT 00000000fc002c40 0FDEF (v02 Xen HVM 00000000 INTL 20100331)
ACPI: FACS 00000000fc002c00 00040
ACPI: APIC 00000000fc012bb0 000D8 (v02 Xen HVM 00000000 HVML 00000000)
ACPI: Local APIC address 0xfee00000
No NUMA configuration found
Faking a node at 0000000000000000-0000000410400000
Bootmem setup node 0 0000000000000000-0000000410400000
NODE_DATA [0000000000018000 - 000000000002dfff]
bootmap [0000000000100000 - 000000000018207f] pages 83
(8 early reservations) ==> bootmem [0000000000 - 0410400000]
#0 [0000000000 - 0000001000] BIOS data page ==> [0000000000 - 0000001000]
#1 [0000006000 - 0000008000] TRAMPOLINE ==> [0000006000 - 0000008000]
#2 [0001000000 - 00022056ac] TEXT DATA BSS ==> [0001000000 - 00022056ac]
#3 [0037374000 - 0037fef0ec] RAMDISK ==> [0037374000 - 0037fef0ec]
#4 [000009fc00 - 0000100000] BIOS reserved ==> [000009fc00 - 0000100000]
#5 [0002206000 - 0002206099] BRK ==> [0002206000 - 0002206099]
#6 [0000008000 - 000000b000] PGTABLE ==> [0000008000 - 000000b000]
#7 [000000b000 - 0000018000] PGTABLE ==> [000000b000 - 0000018000]
found SMP MP-table at [ffff8800000fbcf0] fbcf0
[ffffea0000000000-ffffea000e5fffff] PMD -> [ffff880028600000-ffff8800369fffff] on node 0
Zone PFN ranges:
DMA 0x00000000 -> 0x00001000
DMA32 0x00001000 -> 0x00100000
Normal 0x00100000 -> 0x00410400
Movable zone start PFN for each node
early_node_map[3] active PFN ranges
0: 0x00000000 -> 0x0000009f
0: 0x00000100 -> 0x000f0000
0: 0x00100000 -> 0x00410400
On node 0 totalpages: 4195231
DMA zone: 56 pages used for memmap
DMA zone: 115 pages reserved
DMA zone: 3828 pages, LIFO batch:0
DMA32 zone: 14280 pages used for memmap
DMA32 zone: 964664 pages, LIFO batch:31
Normal zone: 43918 pages used for memmap
Normal zone: 3168370 pages, LIFO batch:31
ACPI: PM-Timer IO Port: 0x1f48
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x02] enabled)
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x04] enabled)
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x06] enabled)
ACPI: LAPIC (acpi_id[0x04] lapic_id[0x08] enabled)
ACPI: LAPIC (acpi_id[0x05] lapic_id[0x0a] enabled)
ACPI: LAPIC (acpi_id[0x06] lapic_id[0x0c] enabled)
ACPI: LAPIC (acpi_id[0x07] lapic_id[0x0e] enabled)
ACPI: LAPIC (acpi_id[0x08] lapic_id[0x10] disabled)
ACPI: LAPIC (acpi_id[0x09] lapic_id[0x12] disabled)
ACPI: LAPIC (acpi_id[0x0a] lapic_id[0x14] disabled)
ACPI: LAPIC (acpi_id[0x0b] lapic_id[0x16] disabled)
ACPI: LAPIC (acpi_id[0x0c] lapic_id[0x18] disabled)
ACPI: LAPIC (acpi_id[0x0d] lapic_id[0x1a] disabled)
ACPI: LAPIC (acpi_id[0x0e] lapic_id[0x1c] disabled)
ACPI: IOAPIC (id[0x01] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 1, version 17, address 0xfec00000, GSI 0-47
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 low level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 low level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 low level)
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ5 used by override.
ACPI: IRQ9 used by override.
ACPI: IRQ10 used by override.
ACPI: IRQ11 used by override.
Using ACPI (MADT) for SMP configuration information
SMP: Allowing 15 CPUs, 7 hotplug CPUs
nr_irqs_gsi: 48
Xen version 4.0.
Xen Platform PCI: I/O protocol version 1
Netfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated NICs.
Blkfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated disks.
You might have to change the root device
from /dev/hd[a-d] to /dev/xvd[a-d]
in your root= kernel command line option
PM: Registered nosave memory: 000000000009f000 - 00000000000a0000
PM: Registered nosave memory: 00000000000a0000 - 00000000000e0000
PM: Registered nosave memory: 00000000000e0000 - 0000000000100000
PM: Registered nosave memory: 00000000f0000000 - 00000000fc000000
PM: Registered nosave memory: 00000000fc000000 - 0000000100000000
Allocating PCI resources starting at f0000000 (gap: f0000000:c000000)
Booting paravirtualized kernel on Xen
NR_CPUS:256 nr_cpumask_bits:256 nr_cpu_ids:15 nr_node_ids:1
PERCPU: Embedded 29 pages/cpu @ffff880028200000 s87512 r8192 d23080 u131072
pcpu-alloc: s87512 r8192 d23080 u131072 alloc=1*2097152
pcpu-alloc: [0] 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 --
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 4136862
Policy zone: Normal
Kernel command line: ro root=/dev/mapper/vg_cycnapsrv-lv_root rd_LVM_LV=vg_cycnapsrv/lv_root rd_LVM_LV=vg_cycnapsrv/lv_swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=zh_CN.UTF-8 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet
PID hash table entries: 4096 (order: 3, 32768 bytes)
Initializing CPU#0
Checking aperture...
No AGP bridge found
Calgary: detecting Calgary via BIOS EBDA area
Calgary: Unable to locate Rio Grande table in EBDA - bailing!
PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
Placing 64MB software IO TLB between ffff880020000000 - ffff880024000000
software IO TLB at phys 0x20000000 - 0x24000000
Memory: 16448052k/17043456k available (4365k kernel code, 262532k absent, 332872k reserved, 7027k data, 1688k init)
Hierarchical RCU implementation.
NR_IRQS:4352 nr_irqs:936
Xen HVM callback vector for event delivery is enabled
Console: colour VGA+ 80x25
console [tty0] enabled
allocated 169082880 bytes of page_cgroup
please try 'cgroup_disable=memory' option if you don't want memory cgroups
Fast TSC calibration using PIT
Detected 2128.788 MHz processor.
Calibrating delay loop (skipped), value calculated using timer frequency.. 4257.57 BogoMIPS (lpj=212878
Security Framework initialized
SELinux: Initializing.
SELinux: Starting in permissive mode
Dentry cache hash table entries: 2097152 (order: 12, 16777216 bytes)
Inode-cache hash table entries: 1048576 (order: 11, 8388608 bytes)
Mount-cache hash table entries: 256
Initializing cgroup subsys ns
Initializing cgroup subsys cpuacct
Initializing cgroup subsys memory
Initializing cgroup subsys devices
Initializing cgroup subsys freezer
Initializing cgroup subsys net_cls
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 256K
CPU: L3 cache: 24576K
CPU 0/0x0 -> Node 0
CPU: Unsupported number of siblings 128
mce: CPU supports 24 MCE banks
Performance Events: unsupported p6 CPU model 47 no PMU driver, software events only.
ACPI: Core revision 20090903
ftrace: converting mcount calls to 0f 1f 44 00 00
ftrace: allocating 22502 entries in 89 pages
Setting APIC routing to physical flat
..TIMER: vector=0x30 apic1=0 pin1=2 apic2=0 pin2=0
CPU0: Intel(R) Xeon(R) CPU E7- 4830 @ 2.13GHz stepping 02
Booting processor 1 APIC 0x2 ip 0x6000
Initializing CPU#1
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 256K
CPU: L3 cache: 24576K
CPU 1/0x2 -> Node 0
CPU: Unsupported number of siblings 128
CPU1: Intel(R) Xeon(R) CPU E7- 4830 @ 2.13GHz stepping 02
checking TSC synchronization [CPU#0 -> CPU#1]: passed.
Booting processor 2 APIC 0x4 ip 0x6000
Initializing CPU#2
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 256K
CPU: L3 cache: 24576K
CPU 2/0x4 -> Node 0
CPU: Unsupported number of siblings 128
CPU2: Intel(R) Xeon(R) CPU E7- 4830 @ 2.13GHz stepping 02
checking TSC synchronization [CPU#0 -> CPU#2]: passed.
Booting processor 3 APIC 0x6 ip 0x6000
这个问题是内存的原因。把内存拆出来，擦一下黄金脚就解决了
