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From:   Thomas Gleixner <tglx@linutronix.de>
To:     Scott Branden <scott.branden@broadcom.com>, bp@alien8.de,
        x86@kernel.org, mingo@redhat.com
Cc:     linux-kernel@vger.kernel.org,
        Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: Kernel panic - not syncing: IO-APIC + timer doesn't work!
In-Reply-To: <cc298d3e-9a14-d3e1-025b-6bb1f8bfb4ae@broadcom.com>
References: <18cb4d48-6571-1fdb-5902-ba64c23eee75@broadcom.com> <87h7tsbs1n.fsf@nanos.tec.linutronix.de> <e0ce41cd-9149-e43e-f4ca-e75503cb82e3@broadcom.com> <87blk0aw1k.fsf@nanos.tec.linutronix.de> <cc298d3e-9a14-d3e1-025b-6bb1f8bfb4ae@broadcom.com>
Date:   Wed, 29 Jul 2020 11:50:41 +0200
Message-ID: <87y2n2abv2.fsf@nanos.tec.linutronix.de>
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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.=C2=A0 Same kernel panic issue.=C2=A0 Log be=
low.
>>>
>>> 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 po=
wer off for only a few seconds
> before re-powering the system.=C2=A0 It has not failed via reboot yet tha=
t 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