linux-kernel - Re: [LKP] [x86/hotplug] e1056a25da: WARNING:at_arch/x86/kernel/apic/apic.c:#setup_local

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Date:   Fri, 28 Jun 2019 16:51:07 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>, tipbuild@...or.com,
        Fengguang Wu <fengguang.wu@...el.com>, lkp@...org,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [LKP] [x86/hotplug] e1056a25da:
 WARNING:at_arch/x86/kernel/apic/apic.c:#setup_local_APIC

On 6/27/19 10:26 PM, Thomas Gleixner wrote:
> Rong, Fengguang,
>
> On Wed, 26 Jun 2019, Rong Chen wrote:
>> On 6/25/19 7:32 PM, Thomas Gleixner wrote:
>>>> I have tested commit e0b179bc1a ("x86/apic/x2apic: Add conditional IPI
>>>> shorthands support"), the problem is still exist.
>>> the head of that branch is:
>>>
>>>         4f3f6d6a7f8e ("x86/apic/x2apic: Add conditional IPI shorthands
>>> support")
>>>
>>> This is WIP and force pushed. There are no incremental changes. Could you
>>> please check again?
>> The problem is still exist.
> I went through hoops and loops to get that lkp muck running, but as many
> different machines I tried on it never reproduced.
>
> So I need a bit of help from you folks. Can you please provide me:
>
>     1) The exact host kernel version
# uname -r
4.20.0


>     2) The config file

attached ("config-5.2.0-rc5-00003-ge1056a2")


>     3) The exact kvm-qemu version

# qemu-system-x86_64 --version
QEMU emulator version 3.1.0 (Debian 1:3.1+dfsg-8)
Copyright (c) 2003-2018 Fabrice Bellard and the QEMU Project developers


>
> Also it would be interesting whether 4f3f6d6a7f8e from that WIP.x86/ipi
> branch in tip has the same issue on other host machines.

yes. it has the same issue.


>
> Another data point would be whether it depends on a particular compiler
> version.

the issue could be reproduced too when built with gcc-8


>        
> Thanks in advance,
>
> 	tglx
>
> P.S: the instructions for reproducing the issue in that robot mail are
> incomplete because there is no information how to bring the module into
> that initrd... I somehow figured it out.

Thanks for the input, we'll improve the tips.

Best Regards,
Rong Chen

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