Re: PYXIS machine check

[Praveen Srinivasan <psrin0 pop uky edu>]

This certainly seems likely, as I only get this error when I am using the pd
kernel module, and never at any other time.

Praveen

kelvin@qantel.com wrote:

> Praveen Srinivasan wrote:
>
> >So does this mean I need to replace my RAM?
> >
> >Praveen
> >
> >Greg Lindahl wrote:
> >
> >> > PYXIS Macine check: vector=0x660 pc=0xfffffc00003104a0 code=0x202
> >>
> >> The vector is the most important part of this, not the pc. According to
> >> Jay's posting of 2 weeks ago, which should go into the FAQ:
> >>
> >> Machine checks are of four (4) types, as in the following table:
> >>
> >> Code      Reason                  Example or Common Cause
> >> ====      ======                  =======================
> >>
> >> 620     System Correctable        correctable errors in the memory
> subsystem,
> >>                                   eg single bit ECC errors, detected
> async to
> >>                                   processor execution
> >>
> >> 630     Processor Correctable     correctable cache and TLB errors,
> detected
> >>                                   internally by the processor
> >>
> >> 660     System Uncorrectable      unrecoverable memory errors
> >>
> >> 670     Processor Uncorrectable   unrecoverable cache or TLB errors, or
> >>                                   read of a non-existent I/O space
> location
> >>
> >> This means that you're getting a double-bit error in your RAM. Jay
> implies
> >> that the errors are reported asynchronously, so the PC doesn't mean
> >> anything...
> >>
> >> -- g
>
> I think this is more likely a programming problem.  This error
> can be caused by accessing non-existent memory.  The pyxis chip
> ECC checking is mainly done when non-processor accesses are
> occurring, such as PCI bus master DMA, and getting a double bit
> error is very unlikely if you have not gotten any single bit
> errors.  Other things which can cause it are PCI bus parity
> errors and PCI bus time-outs.
>
> Kelvin
>
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