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Subject: Re: Kernel panic - not syncing: IO-APIC + timer doesn't work!
To:     Thomas Gleixner <tglx@linutronix.de>,
        Scott Branden <scott.branden@broadcom.com>, bp@alien8.de,
        x86@kernel.org, mingo@redhat.com
Cc:     linux-kernel@vger.kernel.org
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 <cc298d3e-9a14-d3e1-025b-6bb1f8bfb4ae@broadcom.com>
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From:   Tom Lendacky <thomas.lendacky@amd.com>
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Date:   Wed, 29 Jul 2020 13:29:32 -0500
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On 7/29/20 4:50 AM, Thomas Gleixner wrote:
> Scott,
> 
> Scott Branden <scott.branden@broadcom.com> writes:
>> On 2020-07-28 1:22 a.m., Thomas Gleixner wrote:
>>> Scott Branden <scott.branden@broadcom.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.

I asked around and was told this is most likely the motherboard has not
decayed its DC rails. So it's quite possible that keeping it powered off
for a longer period of time before powering back on may help.

Thanks,
Tom

> 
> Thanks,
> 
>         tglx
>