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Message-ID: <09d67d1d-2c65-4872-b38e-665eda154339@leemhuis.info>
Date: Thu, 4 Apr 2024 10:24:14 +0200
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Subject: Re: [REGRESSION] mainline boot regression on AMD Stoney Ridge
 Chromebooks
To: tglx@linutronix.de
Cc: kernel@collabora.com, linux-kernel@vger.kernel.org,
 regressions@lists.linux.dev, Laura Nao <laura.nao@collabora.com>,
 the arch/x86 maintainers <x86@kernel.org>
References: <20240328094433.20737-1-laura.nao@collabora.com>
 <20240328115015.36646-1-laura.nao@collabora.com>
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@leemhuis.info>
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[/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?

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