This was very helpful. Tracing through the code, it doesn't do a panic before Linux crashes from multi-bit errors because as York has indicated, this type of memory controller doesn't limit the number of errors. I do have a general question about single bit errors. The EDAC driver corrects single bit errors by doing a scrub, is this correct? The edac code does not do periodic scrubs, but I see scrubs when a correctable error is found (edac_mc_scrub_block and edac_atomic_scrub in edac_mc.c)? This is more directed toward York for layerscape. I see some edac code that seem to do periodic scrubs based on intervals or scrub rate, but that is not needed for the layerscape driver to correct errors because errors are scrubbed when found by the edac scrub block or is it because the memory controller itself does the correction/scrubbing when an error is found? thx, Tracy On Wed, Nov 28, 2018 at 5:44 PM Borislav Petkov <bp@xxxxxxxxx> wrote: > > On Wed, Nov 28, 2018 at 04:14:24PM -0600, Tracy Smith wrote: > > Is there another way of creating an uncorrected error without crashing > > Linux using the layerscape driver? I would like to see a UE error > > collected without a Linux crash scenario because I need to validate > > UEs are being collected. > > It depends on whether the hardware is causing the crash on uncorrectable > error to prevent data corruption or the error handler is calling panic() > or somesuch. If it is the former, then you need to disable that feature > - if at all possible (no clue what that platform does). > > If it is the latter, you can comment out the panic() for testing > purposes only and inject then. For an example what x86 does, see > "tolerant" here: > > Documentation/x86/x86_64/machinecheck > > HTH. > > -- > Regards/Gruss, > Boris. > > Good mailing practices for 400: avoid top-posting and trim the reply. -- Confidentiality notice: This e-mail message, including any attachments, may contain legally privileged and/or confidential information. If you are not the intended recipient(s), please immediately notify the sender and delete this e-mail message.
