Notes about APEI Error INJection

APEI (ACPI Platform Error Interface) EINJ provides a hardware error injection mechanism. It is very useful for debugging and testing APEI and RAS features in general.

An error injection example:

# cd /sys/kernel/debug/apei/einj
# cat available_error_type            # See which errors can be injected
0x00000002    Processor Uncorrectable non-fatal
0x00000008    Memory Correctable
0x00000010    Memory Uncorrectable non-fatal
# echo 0x12345000 > param1            # Set memory address for injection
# echo $((-1 << 12)) > param2         # Mask 0xfffffffffffff000 - anywhere in this page
# echo 0x8 > error_type                       # Choose correctable memory error
# echo 1 > error_inject                       # Inject now

You should see something like this in dmesg:

[22715.830801] EDAC sbridge MC3: HANDLING MCE MEMORY ERROR
[22715.834759] EDAC sbridge MC3: CPU 0: Machine Check Event: 0 Bank 7: 8c00004000010090
[22715.834759] EDAC sbridge MC3: TSC 0
[22715.834759] EDAC sbridge MC3: ADDR 12345000 EDAC sbridge MC3: MISC 144780c86
[22715.834759] EDAC sbridge MC3: PROCESSOR 0:306e7 TIME 1422553404 SOCKET 0 APIC 0
[22716.616173] EDAC MC3: 1 CE memory read error on CPU_SrcID#0_Channel#0_DIMM#0 (channel:0 slot:0 page:0x12345 offset:0x0 grain:32 syndrome:0x0 -  area:DRAM err_code:0001:0090 socket:0 channel_mask:1 rank:0)

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