Re: Machine check exception

["F. P. Beekhof" <fpbeekhof@gmail.com>]

Note: after a suspend/resume cycle, the register value is back at 8, so 
I have to run the commands again to set it to 100008

# rdmsr -x 0xc001001f
100008
(suspend / resume)
# rdmsr -x 0xc001001f
8


On 07/27/2011 10:54 PM, F. P. Beekhof wrote:
> On 07/27/2011 07:03 PM, Borislav Petkov wrote:
>> On Wed, Jul 27, 2011 at 05:31:56PM +0200, F. P. Beekhof wrote:
>>> $ sudo rdmsr 0xc001001f
>>> 8
>>>
>>> Is there anything else I can do ?
>>
>> Ok, I'd like you to try something out:
>>
>> Boot into runlevel 1: you need this because you get the MCE before
>> you've done starting apache. For that, add a "1" to your kernel command
>> line and boot. When you get the prompt, type in your root pwd and do
>>
>> wrmsr 0xc001001f $(( $(rdmsr -u 0xc001001f) | (1<< 20) ))
>>
>> Then do
>>
>> rdmsr -x 0xc001001f
>>
>> to verify that the write has succeeded. It should say
>>
>> 0x00100008.
>>
>> then exit the prompt to continue to runlevel 2 to see whether this
>> setting fixes your MCE issue.
>>
>> This is for now,
>> thanks.
>>
>
> Ok, writing the register worked.
>
> Now we just need to wait, these crashes occur at random moments.
> Sometimes there is 5 minutes between two crashes, sometimes a few days...
>
> I'll post an update as soon as I have more information.
>
> Thanks for helping out!
>