linux-kernel - Re: kernel BUG at arch/x86/kernel/apic/apic.c with Dell server with x2APIC enabled and unset X2APIC

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Date:   Mon, 24 Feb 2020 13:59:43 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, LKML <linux-kernel@...r.kernel.org>,
        it+linux-x86@...gen.mpg.de
Subject: Re: kernel BUG at arch/x86/kernel/apic/apic.c with Dell server with
 x2APIC enabled and unset X2APIC

Dear Thomas,


On 2020-02-21 17:27, Thomas Gleixner wrote:

> Paul Menzel writes:
>>
>> On the Dell PowerEdge T640/04WYPY, BIOS 2.4.8 11/27/2019, Linux 5.4.14 (and 4.19.57) with
>> unset `IRQ_REMAP` and `X86_X2APIC` crashes on start-up, when x2APIC is enabled in the
>> firmware.
> 
>>     [    3.883893] Switched APIC routing to physical flat.
>>     [    3.888904] ------------[ cut here ]------------
>>     [    3.893641] kernel BUG at arch/x86/kernel/apic/apic.c:1616!
> 
> So the APIC is not registered.
>>
>> `noapic` and `acpi=off` separately did not work, but `noapic acpi=off` hit the other
>> panic.
> 
> I have no idea what you are talking about.
> 
> Which command line options are set to reproduce the above?

Sorry, please ignore my debugging attempts. It fails without any of
these.

> Also please test the latest stable kernels not some random ones.

Please see my reply to Borislav with the logs of Linux 5.6-rc2.


Kind regards,

Paul


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