Re: Kernel 6.9 regression: X86: Bogus messages from topology detection

[Thomas Gleixner <tglx@linutronix.de>]

On Fri, May 31 2024 at 10:48, Thomas Gleixner wrote:

> Christian!
>
> On Fri, May 31 2024 at 10:16, Christian Heusel wrote:
>>> One of the reporters in the Arch Bugtracker with an Intel Core i7-7700k
>>> has tested a modified version of this fix[0] with the static change
>>> reversed on top of the 6.9.2 stable kernel and reports that the patch
>>> does not fix the issue for them. I have attached their output for the
>>> patched (dmesg6.9.2-1.5.log) and nonpatched (dmesg6.9.2-1.log) kernel.
>>> 
>>> Should we also get them to test the mainline version or do you need any
>>> other debug output?
>
> Can I get:
>
>     - dmesg from 6.8.y kernel
>     - output of cpuid -r
>     - content of /sys/kernel/debug/x86/topo/cpus/* (on 6.9.y)
>
> please?

It seems there are two different issues here. The dmesg you provided is
from a i7-1255U, which is a hybrid CPU. The i7-7700k has 4 cores (8
threads) and there is not necessarily the same root cause.

Thanks,

        tglx