如何从 MCE 消息中查找故障内存模块？

Question

我试图了解 MCE 消息以查找服务器上的哪个内存模块坏了。此消息出现在/var/log/kern.log今天冻结两次的一台服务器中。

Apr 13 22:39:22 mbox kernel: [36247975.116860] sbridge: HANDLING MCE MEMORY ERROR
Apr 13 22:39:22 mbox kernel: [36247975.116867] CPU 0: Machine Check Exception: 0 Bank 5: 8c00004000010090
Apr 13 22:39:22 mbox kernel: [36247975.116869] TSC 0 ADDR 4a0d75900 MISC 21405cdc86 PROCESSOR 0:206d7 TIME 1428957562 SOCKET 0 APIC 0
Apr 13 22:39:22 mbox kernel: [36247975.951013] EDAC MC0: 1 CE memory read error 

我怀疑内存模块坏了。服务器是 2x Xeon E5-2650，带有 8x8Go 内存模块（每个 CPU 8 个内存插槽）

这是来自lshw：的内存模块数量：

 *-memory:0
      description: System Memory
      physical id: 2d
      slot: System board or motherboard
    *-bank:0
         description: DIMM DDR3 1333 MHz (0,8 ns)
         product: 9965516-197.A
         vendor: Kingston
         physical id: 0
         serial: B83AE5C2
         slot: P1_DIMMA1
         size: 8GiB
         width: 64 bits
         clock: 1333MHz (0.8ns)
    *-bank:1
         description: DIMM Synchronous [empty]
         product: Dimm1_PartNum
         vendor: Dimm1_Manufacturer
         physical id: 1
         serial: Dimm1_SerNum
         slot: P1_DIMMA2
         width: 64 bits
    *-bank:2
         description: DIMM DDR3 1333 MHz (0,8 ns)
         product: 9965516-048.A
         vendor: Kingston
         physical id: 2
         serial: EC309238
         slot: P1_DIMMB1
         size: 8GiB
         width: 64 bits
         clock: 1333MHz (0.8ns)
    *-bank:3
         description: DIMM Synchronous [empty]
         product: Dimm4_PartNum
         vendor: Dimm4_Manufacturer
         physical id: 3
         serial: Dimm4_SerNum
         slot: P1_DIMMB2
         width: 64 bits
    *-bank:4
         description: DIMM DDR3 1333 MHz (0,8 ns)
         product: 9965516-048.A
         vendor: Kingston
         physical id: 4
         serial: E9305438
         slot: P1_DIMMC1
         size: 8GiB
         width: 64 bits
         clock: 1333MHz (0.8ns)
    *-bank:5
         description: DIMM Synchronous [empty]
         product: Dimm7_PartNum
         vendor: Dimm7_Manufacturer
         physical id: 5
         serial: Dimm7_SerNum
         slot: P1_DIMMC2
         width: 64 bits
    *-bank:6
         description: DIMM DDR3 1333 MHz (0,8 ns)
         product: 9965516-048.A
         vendor: Kingston
         physical id: 6
         serial: E7305738
         slot: P1_DIMMD1
         size: 8GiB
         width: 64 bits
         clock: 1333MHz (0.8ns)
    *-bank:7
         description: DIMM Synchronous [empty]
         product: Dimm10_PartNum
         vendor: Dimm10_Manufacturer
         physical id: 7
         serial: Dimm10_SerNum
         slot: P1_DIMMD2
         width: 64 bits
 *-memory:1
      description: System Memory
      physical id: 3f
      slot: System board or motherboard
    *-bank:0
         description: DIMM DDR3 1333 MHz (0,8 ns)
         product: 9965516-197.A
         vendor: Kingston
         physical id: 0
         serial: B63A08C3
         slot: P2_DIMME1
         size: 8GiB
         width: 64 bits
         clock: 1333MHz (0.8ns)
    *-bank:1
         description: DIMM Synchronous [empty]
         product: Dimm1_PartNum
         vendor: Dimm1_Manufacturer
         physical id: 1
         serial: Dimm1_SerNum
         slot: P2_DIMME2
         width: 64 bits
    *-bank:2
         description: DIMM DDR3 1333 MHz (0,8 ns)
         product: 9965516-048.A
         vendor: Kingston
         physical id: 2
         serial: EA309638
         slot: P2_DIMMF1
         size: 8GiB
         width: 64 bits
         clock: 1333MHz (0.8ns)
    *-bank:3
         description: DIMM Synchronous [empty]
         product: Dimm4_PartNum
         vendor: Dimm4_Manufacturer
         physical id: 3
         serial: Dimm4_SerNum
         slot: P2_DIMMF2
         width: 64 bits
    *-bank:4
         description: DIMM DDR3 1333 MHz (0,8 ns)
         product: 9965516-048.A
         vendor: Kingston
         physical id: 4
         serial: E7305938
         slot: P2_DIMMG1
         size: 8GiB
         width: 64 bits
         clock: 1333MHz (0.8ns)
    *-bank:5
         description: DIMM Synchronous [empty]
         product: Dimm7_PartNum
         vendor: Dimm7_Manufacturer
         physical id: 5
         serial: Dimm7_SerNum
         slot: P2_DIMMG2
         width: 64 bits
    *-bank:6
         description: DIMM DDR3 1333 MHz (0,8 ns)
         product: 9965516-048.A
         vendor: Kingston
         physical id: 6
         serial: E7305B38
         slot: P2_DIMMH1
         size: 8GiB
         width: 64 bits
         clock: 1333MHz (0.8ns)
    *-bank:7
         description: DIMM Synchronous [empty]
         product: Dimm10_PartNum
         vendor: Dimm10_Manufacturer
         physical id: 7
         serial: Dimm10_SerNum
         slot: P2_DIMMH2
         width: 64 bits
 *-memory:2 UNCLAIMED
      physical id: 7
 *-memory:3 UNCLAIMED
      physical id: 9

如您所见，#5 组上没有内存模块。所以我的问题是：你同意这条消息是关于内存故障的吗？如果是这样，我怎样才能找到要更换的模块？

Answer 1

这些错误来自 EDAC - 错误检测和纠正。

edac_mc 设备的类别。

您收到的事件是 CE 事件（可纠正的错误）。这些迹象表明 DIMM 开始出现故障。

EDAC 没有报告关于它所指的内存行或通道的任何具体信息，因此很难判断要替换哪一个，直到那个失败为止。

但是看看/sys/devices/system/edac/mc/mc*这可能会告诉你更多关于哪一行/DIMM可能是有问题的。

例如

ls -s /sys/devices/system/edac/mc/mc0
total 0
0 ce_count 0 csrow1 0 csrow4 0 csrow7 0 reset_counters 0 size_mb
0 ce_noinfo_count 0 csrow2 0 csrow5 0 device 0 sdram_scrub_rate 0 ue_count
0 csrow0 0 csrow3 0 csrow6 0 mc_name 0 seconds_since_reset 0 ue_noinfo_count

看看ce_count球场。

旁注：

该系统仍可继续运行，但安全性较低。具有 CE 的内存 DIMM 的预防性维护和主动部件更换可以降低可怕的 UE（不可纠正错误）事件和系统“恐慌”的可能性。

有关 EDAC 的更多信息，请访问：

https://www.kernel.org/doc/Documentation/edac.txt