x86_64 mce_log question

x86_64 mce_log question

[Evgeny Rodichev]

Hello,

at Opteron-based x86_64 system sometimes I get message

Machine check events logged

(non-fatal). How can I read the correspondent events? From the source
code (arch/x86_64/kernel/mce.c) it sounds like some misc device with
MISC_MCELOG_MINOR 227 is registered (with name "mcelog"?), but there is
no such device under /dev.

Thank you.
_________________________________________________________________________
Evgeny Rodichev                          Sternberg Astronomical Institute
email: er@sai.msu.su                              Moscow State University
Phone: 007 (095) 939 2383
Fax:   007 (095) 932 8841                       http://www.sai.msu.su/~er

Re: x86_64 mce_log question

[Andi Kleen]

Evgeny Rodichev <er@sai.msu.su> writes:

> Hello,
> 
> at Opteron-based x86_64 system sometimes I get message
> 
> Machine check events logged
> 
> (non-fatal). How can I read the correspondent events?

Read the help

config X86_MCE
        bool "Machine check support" if EMBEDDED
        default y
        help
           Include a machine check error handler to report hardware errors.
           This version will require the mcelog utility to decode some
           machine check error logs. See
           ftp://ftp.x86-64.org/pub/linux/tools/mcelog


> From the source
> code (arch/x86_64/kernel/mce.c) it sounds like some misc device with
> MISC_MCELOG_MINOR 227 is registered (with name "mcelog"?), but there is
> no such device under /dev.

Your distribution is broken then. In fact it is supposed to run
mcelog regularly from a cronjob to log machine check events into
a disk log. Complain to them.

-Andi