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Date:   Wed, 6 Jul 2022 18:56:04 +0000
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Subject: Re: [Regression?] Linux 5.19-rc5 gets stuck on boot, not rc4
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To:     Thorsten Leemhuis <regressions@leemhuis.info>,
        "Limonciello, Mario" <Mario.Limonciello@amd.com>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "platform-driver-x86@vger.kernel.org" 
        <platform-driver-x86@vger.kernel.org>,
        Hans de Goede <hdegoede@redhat.com>,
        Jani Nikula <jani.nikula@intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>
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From:   Tor Vic <torvic9@mailbox.org>
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On 06.07.22 18:21, Thorsten Leemhuis wrote:
> On 06.07.22 10:42, torvic9@mailbox.org wrote:
>>
>>> Limonciello, Mario <mario.limonciello@amd.com> hat am 05.07.2022 17:10 GMT geschrieben:
>>>> -----Original Message-----
>>>> From: Linus Torvalds <torvalds@linux-foundation.org>
>>>> Sent: Tuesday, July 5, 2022 11:40
>>>> To: Tor Vic <torvic9@mailbox.org>
>>>> Cc: linux-kernel@vger.kernel.org; platform-driver-x86@vger.kernel.org;
>>>> Hans de Goede <hdegoede@redhat.com>; Jani Nikula
>>>> <jani.nikula@intel.com>
>>>> Subject: Re: [Regression?] Linux 5.19-rc5 gets stuck on boot, not rc4
>>>>
>>>> On Tue, Jul 5, 2022 at 6:50 AM <torvic9@mailbox.org> wrote:
>>>>>
>>>>> Linux 5.19-rc5 does not boot on my Kaby Lake Thinkpad.
>>>>> rc3 and rc4 were still fine, so I guess something between rc4 and rc5
>>>>> introduced a regression.
>>>>
>>>> Sounds that way.
>>>>
>>>>> Unfortunately, there are no errors or warning messages.
>>>>> It gets stuck quite early on boot, about the time USB is initialized,
>>>>> so less than 1 second into post-bootloader boot.
>>>>> It then just sits there doing nothing - SysRq still works though.
>>>>
>>>> There aren't all that many changes in rc5, and your hardware looks
>>>> *very* standard (all intel chipset, and a Samsung SM961 SSD).
>>>>
>>>> And with the lack of details, we'll either need a bisect:
>>>>
>>>>> I don't have time for a bisect, but I thought I'll let you know about
>>>>> this issue, and maybe someone already has an idea.
>>>>
>>>> or we'll need more reports..
>>>>
>>>>> Some system information below. Root filesystem is f2fs.
>>>>
>>>> Ok, f2fs is certainly unusual, but there are no f2fs changes in rc5.
>>>>
>>>> There's some PM changes for i915 ("drm/i915/dgfx: Disable d3cold at
>>>> gfx root port") and a couple of thinkpad-acpi platform driver updates,
>>>> so I'm adding a few random people to the cc in case somebody goes
>>>> "ahh..."
>>>>
>>>
>>> If a bisect isn't possible for you the kernel command line should be pretty
>>> helpful to isolate which area the problem is introduced.
>>> I'd say start out with "nomodeset" on the kernel command line to prevent
>>> i915 from loading.  If that fixes it, hopefully it's a small number of commits
>>> to peel back like the one Linus mentioned.
>>
>> Good advice!
>> Using "nomodeset" makes the computer boot again.
> 
> Wild guess, I'm not involved at all in any of the following, I just
> noticed it and thought it might be worth mentioning:
> 
> I heard Fedora rawhide added this patch to solve a boot problem that
> sounded similar to yours:
> https://patchwork.freedesktop.org/patch/489982/
> 
> See also this thread:
> https://lore.kernel.org/all/fddf5ca6-77dc-88f9-c191-7de09717063c@redhat.com/

Hi Thorsten,

Yep, that sounds just like it!
I do have 'CONFIG_SYSFB_SIMPLEFB=y' in my laptop's config.

Will try this tomorrow and report back again.

> 
> A few config option are mentioned there that seem to have an impact.
> Maybe it's worth changing those or trying that patch.
> 
> But as I said, I'm not involved, so maybe this is a bad advice.
> 
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> 
> P.S.: As the Linux kernel's regression tracker I deal with a lot of
> reports and sometimes miss something important when writing mails like
> this. If that's the case here, don't hesitate to tell me in a public
> reply, it's in everyone's interest to set the public record straight.