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From: Thomas Gleixner <tglx@linutronix.de>
To: Christian Heusel <christian@heusel.eu>
Cc: Peter Schneider <pschneider1968@googlemail.com>, LKML
 <linux-kernel@vger.kernel.org>, x86@kernel.org, stable@vger.kernel.org,
 regressions@lists.linux.dev
Subject: Re: Kernel 6.9 regression: X86: Bogus messages from topology detection
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Date: Fri, 31 May 2024 11:11:39 +0200
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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