On Sun, 15 Aug 2021 at 21:31, John Mellor <john.mel...@gmail.com> wrote:

>
> Just an update:
>
> The type of failure that I consistently kept seeing in the logs was
> illegal addressing in high memory during shutdown.  The failing address
> always looked like a couple of stuck high address bits, which was
> unlikely with a well-tested processor, motherboard and memory.
> Sometimes that was not fatal, while other times it cause a hard crash or
> a freeze.  Repeated memory and motherboard testing has shown no fault,
> and I've replace everything else multiple times.  This kind of fault is
> really tough to diagnose. Upon a lot of reflection in the middle of more
> than a few nights, I upgraded the BIOS and ACPI firmware on this Lenovo
> P300 from the 2016 version to the latest June/2020 version.  Since then
> I have not experienced a failure in 3 weeks of daily use with daily
> shutdowns.
>
> As an aside, Lenovo does not make it easy to upgrade unless you are on
> Windows -- something for the Lenovo folks to rectify in their firmware
> distribution site.  Thankfully the stand-alone DVD image did the trick.
>
> This outcome is a huge relief, but would seem to show that something in
> the ACPI code is not checking for valid addresses. The newer ACPI
> firmware is no longer providing bogus addresses, and the problem has
> gone away -- something for the kernel people to think about and identify
> the faulty/missing checks.
>
> I'm still waiting and watching, but the machine is now highly stable
> when running Fedora.
>

Maybe the ACPI changes are related to ACPI Platform Profile support, see
https://www.phoronix.com/scan.php?page=news_item&px=Linux-ACPI-Platform-Profile

-- 
George N. White III
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