linux-kernel - Re: Kernel panic - not syncing: IO-APIC + timer doesn't work!

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Message-ID: <87y2n2abv2.fsf@nanos.tec.linutronix.de>
Date:   Wed, 29 Jul 2020 11:50:41 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Scott Branden <scott.branden@...adcom.com>, bp@...en8.de,
        x86@...nel.org, mingo@...hat.com
Cc:     linux-kernel@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: Kernel panic - not syncing: IO-APIC + timer doesn't work!

Scott,

Scott Branden <scott.branden@...adcom.com> writes:
> On 2020-07-28 1:22 a.m., Thomas Gleixner wrote:
>> Scott Branden <scott.branden@...adcom.com> writes:
>>> Bios now updated to latest.  Same kernel panic issue.  Log below.
>>>
>>> I think it is related to power cycling quickly.
>>> Should APIC work if PC power cycled in a few seconds or is that the
>>> problem?
>> Yes, emphasis on should. Just to clarify, if you reboot it works and
>> cold start works as well if power was off long enough?
>>
> So far I have only been able to reproduce the issue by cold start with power off for only a few seconds
> before re-powering the system.  It has not failed via reboot yet that I remember.
> Will have to keep my eye on whether using reboot is an issue or not.
> And also keeping power off longer when doing a cold start.

Weird.

> Please find attached the failed console log with ignore_loglevel.

Aside of the differences caused by the BIOS update there is nothing
related to the APIC/IO-APIC setup which is different between the working
and failing boot.

TBH, I have no idea what's going wrong there. Maybe Tom has one.

Thanks,

        tglx