Re: CPU error codes

["H. Peter Anvin" <hpa@zytor.com>]

Followup to:  <14976.24819.276892.26475@hoggar.fisica.ufpr.br>
By author:    Carlos Carvalho <carlos@fisica.ufpr.br>
In newsgroup: linux.dev.kernel
> 
> Really? I thought it could be because of RAM. Here's the story:
> 
> The kernel is 2.2.18pre24.
> 
> I'm having VERY frequent of this (sometimes once a day, sometimes once
> a week, sometimes twice a day, on a much used machine)
> 
> CPU 1: Machine Check Exception: 0000000000000004
> Bank 4: b200000000040151<0>Kernel panic: CPU context corrupt
> 
> CPU 0: Machine Check Exception: 0000000000000004
> Bank 4: b200000000040151<0>Kernel panic: CPU context corrupt
> 
> CPU 0: Machine Check Exception: 0000000000000004
> Bank 4: b200000000040151<0>Kernel panic: CPU context corrupt
> 
> This is on an ASUS P2B-DS with two PIII 700MHz and 100MHz FSB, 1GB of
> RAM. The mce happens with both processors (the above is just part of
> it).
> 
> I've already changed the motherboard and processors, and it continued.
> Then I changed the memory, and it continues. I also changed the
> power supply just in case, to no avail...
> 
> It happens with PC100 and PC133 memory. I increased the memory latency
> (the SPD says it's cl2, I put it 3T and 10T DRAM) but the problem
> persists.
> 
> Since I changed the main board and processor, I think the most likely
> cause is ram. It seems the x86 can access ram directly, so if there's
> a NMI there what will happen?
> 

Much more likely is that your CPU is bad, or overclocked.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
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