Re: EDAC linux-2.6.34-rc5 non correctable errors not reported on AMD64 opteron

["Prasanna S. Panchamukhi" <prasanna.panchamukhi@riverbed.com>]

Hi Boris,


On Fri, Apr 30, 2010 at 04:00:23AM -0700, Borislav Petkov wrote:
> Hi Prasanna, Keith,
> 
> from what I could see, you're doing the injection correctly and
> the injection code accesses the right bits so that should work ok.
> What happens is rather what Keith explained in detail with the only
> correction that it is not the BIOS but the hardware itself that takes
> action to prevent the system from damaging the data.
> 
> See, double-bit errors are deemed uncorrectable and your machine
> syncfloods¹, i.e. it terminates further stale data propagation.
> Therefore, no software gets to run, not even the machine check handler
> (not to mention the clumsy EDAC error polling mechanism). And that's
> why you don't get the errors reported; OTOH, if you want to test the
> amd64_edac driver, injecting single-bit errors should work and you can
> report to me any issues you encounter.

Is there a way to disable Sync Flood on uncorrectable errors and
instead generate MCE.

Thanks
Prasanna


> 
> Hope that helps.
> 
> Thanks.
> 
> 
> 
> ¹ See the section on Sync Flooding in the Hyper Transport spec if you
> want to know more details on that.
> 
> -- 
> Regards/Gruss,
> Boris.
> 
> --
> Advanced Micro Devices, Inc.
> Operating Systems Research Center

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