Re: MP kernels broken with version 5.4.0-1

[Michael Cree <mcree@orcon.net.nz>]

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.

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.

Cheers
Michael.