Re: Machine check in kernel mode Caused by (from SRR1=2000f930): L1 Data Cache error

[Gabriel Paubert <paubert@iram.es>]

On Fri, Apr 17, 2015 at 06:11:42PM +0200, Knut Lange wrote:
> Hello, 
> 
> I'm Knut Lange. I installed Debian wheezy (Linux Kernel 3.16.0-4-powerpc #1 Debian 3.16.7-ckt7-1 (2015-03-01) ppc GNU/Linux) for Powerpc on an G4 Mac(PowerMac G4 AGP Graphics). 
> 
> Some specifications from lshw:
> 
> -powermac3_1 macrisc2 macrisc power_macintosh
> -OpenFirmware 3
> -CPU 7455, altivec supported
> -L1 Cache 32KiB
> -L2 Cache 256KiB
> -VGA compatible controller RV250 [Radeon 9000 Series] driver=radeon latency=255 mingnt=8
> -FireWire (IEEE 1394) TSB12LV23 IEEE-1394 Controller
> 
> >From time to time i got strange behavior. That's why i give the messages to pastie.org. 
> 
> http://pastie.org/10096124


Bad news, it's an internal processor error. As far as I remember on
these processors the data cache is parity protected.

So either you processor is dying, or it is running too hot, or there
is a problem in the power supply regulators of the processor. 

Actually the power supply is the most likely issue. Very often, because
of aging electrolytic capacitors, power supplies stop being able to
provide the rated current.

    Greetings,
    Gabriel