mcelog.triggers(5)

NAME
mcelog.triggers - mcelog trigger scripts reference

SYNOPSIS
/etc/mcelog/bus-error-trigger
/etc/mcelog/cache-error-trigger
/etc/mcelog/dimm-error-trigger
/etc/mcelog/iomca-error-trigger
/etc/mcelog/page-error-trigger
/etc/mcelog/socket-memory-error-trigger
/etc/mcelog/unknown-error-trigger

DESCRIPTION
mcelog(8) maintains thresholds of errors using a leaky-bucket algorithm. When the number of errors in a specific time window exceeds a pre-configured threshold a trigger will be executed. Triggers are usually shell scripts in the /etc/mcelog directory but can be also other internal actions. Thresholds and triggers can be configured in mcelog.conf(5) Trigger will run as the user configured for mcelog in mcelog.conf, by default root. The default trigger action can be overridden by specifying a different trigger script in the configuration file. Actions in addition to the default trigger (like notifying an administrator) can be put into the respective /etc/mcelog/*.local script which is executed after the default action. This allows updating the default scripts without overriding local actions. All trigger actions are also logged to syslog.

The DIMM and socket memory error triggers

The /etc/mcelog/dimm-error-trigger and /etc/mcelog/socket-memory-error-trigger scripts are executed when a DIMM or a CPU socket exceeds a configured corrected or uncorrected memory error threshold. The thresholds are configured in the mcelog.conf [dimm] and [socket] sections. The default triggers log a warning message in the system log. The triggers are only executed when mcelog runs as a daemon. Arguments are passed as environment variables
THRESHOLD | human readable threshold status
MESSAGE | Human readable consolidated error message
TOTALCOUNT | total corrected or uncorrected count of errors for current DIMM depending on what triggered the event
LOCATION | Consolidated location as a single string
DMI_LOCATION | DIMM location from DMI/SMBIOS if available
DMI_NAME | DIMM identifier from DMI/SMBIOS if available
DIMM | DIMM number reported by hardware
CHANNEL | Channel number reported by hardware
SOCKETID | Socket ID of CPU that includes the memory controller with the DIMM
CECOUNT | Total corrected error count for DIMM
UCCOUNT | Total uncorrected error count for DIMM
LASTEVENT | Time stamp of event that triggered threshold (in time_t format, seconds)
THRESHOLD_COUNT | Total umber of events in current threshold time period of specific type
After the default action local actions in /etc/mcelog/dimm-error-trigger.local or respective /etc/mcelog/socket-memory-error-trigger.local are executed.

The page error trigger

The /etc/mcelog/page-error-trigger script is executed by mcelog in daemon mode when a page in memory exceeds a pre-configured corrected or uncorrected error threshold. mcelog internally also implements offlining the page through the kernel. This is configured through the [page] section of mcelog.conf(5)

The environment arguments are the same as for the dimm-error-trigger script

After the default action local actions in /etc/mcelog/page-error-trigger.loccal are executed.

The cache error trigger

The /etc/mcelog/cache-error-trigger shell script is called for cache error handling in daemon mode when a CPU reports excessive corrected cache errors. This could be a indication for future uncorrected errors.

This trigger is configured through the [cache] section in the mcelog.conf(5) configuration file. The threshold is defined by the CPU. The default trigger offlines the affected CPU cores, unless it is the last core running.

Arguments are passed as environment variables
MESSAGE | Human readable error message
CPU | Linux CPU number that triggered the error
LEVEL | Cache level affected by error
TYPE | Cache type affected by error (Data,Instruction,Generic)
AFFECTED_CPUS | List of CPUs sharing the affected cache
SOCKETID | Socket ID of affected CPU

After the default action local actions in /etc/mcelog/cache-error-trigger.local are executed.

The bus-uc-threshold-trigger

The bus-uc-threshold-trigger runs on uncorrected errors on a IO bus. It is configured through the bus-uc-threshold-trigger and bus-uc-threshold-trigger-threshold options in /etc/mcelog.conf(5). By default it logs a message with the error location to the system log. After the default action local actions in /etc/mcelog/bus-uc-error-trigger.local are executed.

Arguments are passed as environment variables
MESSAGE | Human readable consolidated error message.
LOCATION | Consolidated location as a single string
SOCKETID | Socket ID of CPU that includes the memory controller with the DIMM
LEVEL | Interconnect level
PARTICIPATION | Processor Participation (Originator, Responder or Observer)
REQUEST | Request type (read, write, prefetch, etc.)
ORIGIN | Memory or IO
TIMEOUT | The request timed out or not

The iomca-error-trigger

The iomca-error-trigger runs when a socket receives bus or interconnect errors. It is configured through the iomca-error-trigger and iomca-error-trigger-threshold options in /etc/mcelog.conf. By default it logs a message with the error location to the system log. After the default action local actions in /etc/mcelog/iomca-error-trigger.local are executed.

Arguments are passed as environment variables
MESSAGE | Human readable consolidated error message
LOCATION | Consolidated location as a single string
SOCKETID | Socket ID of CPU that includes the memory controller with the DIMM
CPU | Linux CPU number that triggered the error
SET | PCI segment number
BUS | PCI bus number
DEVICE | PCI device number
FUNCTION | PCI function number

The unknown-error-trigger

The unknown-error-trigger runs on any errors not otherwise categorized. It is configured through the unknown-error-trigger and unknown-error-trigger-threshold options in /etc/mcelog.conf. By default it logs a message to the system log. After the default action local actions in /etc/mcelog/unknown-error-trigger.local are executed.

Arguments are passed as environment variables
MESSAGE | Human readable consolidated error message
LOCATION | Consolidated location as a single string
SOCKETID | Socket ID of CPU that includes the memory controller with the DIMM
CPU | Linux CPU number that triggered the error
STATUS | IA32_MCi_STATUS register value
ADDR | IA32_MCi_ADDR register value
MISC | IA32_MCi_MISC register value
MCGSTATUS | IA32_MCG_STATUS register value
MCGCAP | IA32_MCG_CAP register value

SEE ALSO
http://www.mcelog.org mcelog(8), mcelog.conf(5)