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I have been getting the following problem running Ubuntu 12.10. Basically, it freezes completely, doesn't respond to keyboard or mouse, CAPS won't change and alt+sys req+REISUB doesn't do anything. The problem is consistent in that after a hard reset it will be fine for a while but will freeze at some point. I've tried booting from a startup USB and this also froze so it isn't a OS problem, some hardware issue. Today I got the following messages before it froze. I guess what I want to find out is which hardware component is failing?

[Hardware Error]: CPU 0:  Machine Check Exception: 4 Bank 5: f200141014040400
[Hardware Error]: TSC Zc124d6Zdd
[Hardware Error]: PROCESSOR 0: 1067a TIME 1364221737 SOCKET 0 APIC 0 microcode a07
[Hardware Error]: Run the above through 'mcelog --ascii'
[Hardware Error]: CPU 1: Machine Check Exception: 5 Bank 0: f200084000000800
[Hardware Error]: RIP !INEXACT! 10:<ffffffff81031f8f> {mwait_idle_with_hints +0x5f/0x80}
[Hardware Error]: TSC Zc124d70df
[Hardware Error]: PROCESSOR 0: 1067a TIME 1364221737 SOCKET 0 APIC 1 microcode a07
[Hardware Error]: Run the above through 'mcelog --ascii'
[Hardware Error]: CPU 1: Machine Check Exception: 5 Bank 5: f2001410300c0400
[Hardware Error]: RIP !INEXACT! 10:<ffffffff81031f8f> {mwait_idle_with_hints +0x5f/0x80}
[Hardware Error]: TSC Zc124d70df
[Hardware Error]: Machine check: Processor context corrupt
Kernel Panic - not syncing: Fatal Machine check
panic occurred, switching back to text console
Rebooting in 30seconds ..
ACPI MEMORY or I/O RESET_REG.
ACPI MEMORY or I/O RESET_REG.

EDIT

Also posted here: http://askubuntu.com/questions/272324/any-idea-what-type-of-error-this-is-machine-check-kernel-panic/

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migrated from stackoverflow.com Mar 25 '13 at 16:59

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What was the output when you ran the detected error though 'mcelog --ascii' ? –  Hennes Mar 25 '13 at 17:02
    
The "Intel 64 and IA32 architectures software developers manual -- volume 3B: system programming guide, part 2" has more detailed information in appendix E. It can be found at intel.co.uk/content/www/us/en/architecture-and-technology/… –  Hennes Mar 25 '13 at 23:27
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1 Answer

Well, this kind of error seems well documented:

A Machine Check Exception (MCE) is a type of computer hardware error that  
occurs when a computer's central processing unit detects a hardware problem.
[...] On Linux, a process (such as klogd) writes a message to the kernel log 
and/or the console screen (usually only to the console when the error is 
non-recoverable and the machine crashes as a result).

The causes of this error are pretty vague, but the wikipedia page may help.

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