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From: Thomas Gleixner <>
To: Paul Menzel <>,
	Ingo Molnar <>, Borislav Petkov <>
Cc: "x86\" <>,
	LKML <>,
Subject: Re: kernel BUG at arch/x86/kernel/apic/apic.c with Dell server with x2APIC enabled and unset X2APIC
Date: Fri, 21 Feb 2020 17:27:24 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>


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?

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



  parent reply	other threads:[~2020-02-21 16:27 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-21 14:37 kernel BUG at arch/x86/kernel/apic/apic.c with Dell server with x2APIC enabled and unset X2APIC Paul Menzel
2020-02-21 15:57 ` Borislav Petkov
2020-02-21 16:15   ` Paul Menzel
2020-02-21 16:27     ` Paul Menzel
2020-02-21 16:27 ` Thomas Gleixner [this message]
2020-02-24 12:59   ` Paul Menzel
2022-12-02 13:35 ` [tip: x86/apic] x86/apic: Handle no CONFIG_X86_X2APIC on systems with x2APIC enabled by BIOS tip-bot2 for Mateusz Jończyk

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