Re: MP kernels broken with version 5.4.0-1

On 20.02.22 19:34, Michael Cree wrote:
> On Sun, Feb 20, 2022 at 01:39:44PM +0100, Frank Scheiner wrote:
>> I'm unsure if someone already noticed, but it looks like the MP kernels
>> for the alpha arch are broken since at least 5.4.0-1 ([1]), tested on:
>>
>> * quad processor ES45 (with 5.4.0-1, 5.7.0-1)
>> * single processor AS 800 (with 5.7.0-1)
>> * dual processor DS25 (with 5.4.0-1 and 5.15.0-1)
>
> Commit f2f84b05e02b7710a201f0017b3272ad7ef703d1 is the problem.
> Reverting that results in a working SMP kernel, at least up to
> version 5.8.y.

Great! I hoped you would have a look. :-)

> There is another problem (causing occassional memory corruptions
> in user space) introduced into the 5.9.0 kernel which has proved
> tricky to nail down.  I have an idea where it is but not what
> the actual problem is.

I think I can confirm that, because the panic on my DS25 with 5.15.0-1
looks different than with 5.4.0-1. I didn't create a log, but IIRC the
panic originated from systemd there.

How should we proceed from here?

Cheers,
Frank