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From: Laura Nao <laura.nao@collabora.com>
To: regressions@leemhuis.info
Cc: kernel@collabora.com,
	laura.nao@collabora.com,
	linux-kernel@vger.kernel.org,
	regressions@lists.linux.dev,
	tglx@linutronix.de,
	x86@kernel.org
Subject: Re: [REGRESSION] mainline boot regression on AMD Stoney Ridge Chromebooks
Date: Thu,  4 Apr 2024 11:26:59 +0200
Message-Id: <20240404092659.176813-1-laura.nao@collabora.com>
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Hi Thorsten,

On 4/4/24 10:24, Linux regression tracking (Thorsten Leemhuis) wrote:
> [/me added x86 team]
> 
> On 28.03.24 12:50, Laura Nao wrote:
>>>
>>> I ran a manual bisection to track down the root cause for this
>>> regression and landed on the c749ce
>>> commit from this series:
>>> https://lore.kernel.org/all/20240212153625.145745053@linutronix.de/
> 
> FWIW, that commit is c749ce393b8fe9 ("x86/cpu: Use common topology code
> for AMD") from tglx that was part of the "x86/cpu: Rework topology
> evaluation" series.
> 
>>> Do you have any insight on this issue or any suggestion on how to
>>> effectively debug this?
>>>
>>> Thank you!
> 
> Hmmm, it looks like this did not make any progress. Thomas, did this
> fall through the cracks due to Easter, or is this this on your todo list?
> 
> Or was there some progress and I just missed it?
> 
> Laura Nao, I assume the problem is still happening?

Yes, I confirm the issue is still happening.

See e.g. KernelCI report for next-20240403:

https://linux.kernelci.org/test/plan/id/660dbeed148e1a8a284c4372/

> 
> FWIW, this was the initial problem description:
> 
>>>> KernelCI has identified a mainline boot regression [1] on the following
>>>> AMD Stoney Ridge Chromebooks (grunt family), between v6.8 (e8f897) and
>>>> v6.8-1185-g855684c7d938 (855684):
>>>> - Acer Chromebook Spin 311 R721T (codename kasumi360)
>>>> - HP Chromebook 14 (codename careena)
>>>> - HP Chromebook 11A G6 EE (codename barla)
>>>>
>>>> The kernel doesn't boot at all and nothing is reported on the serial
>>>> console after "Starting kernel ...". The issue is still present on the
>>>> latest mainline revision.
>>>> The defconfig used by KernelCI for the boot tests can be found in [2].
>>>>
>>>> Sending this report in order to track the regression while a fix is
>>>> identified.
>>>>
>>>> Thanks,
>>>>
>>>> Laura
>>>>
>>>> [1] https://linux.kernelci.org/test/case/id/65fca98e3883a392524c4380/
>>>> [2]
>>>> https://storage.kernelci.org/mainline/master/v6.8-11837-g2ac2b1665d3fb/x86_64/x86_64_defconfig%2Bx86-board/gcc-10/config/kernel.config
> 
> 
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> --
> Everything you wanna know about Linux kernel regression tracking:
> https://linux-regtracking.leemhuis.info/about/#tldr
> If I did something stupid, please tell me, as explained on that page.
> 
> #regzbot poke