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Date:   Thu, 27 Jun 2019 16:26:24 +0200 (CEST)
From:   Thomas Gleixner <tglx@linutronix.de>
To:     Rong Chen <rong.a.chen@intel.com>
cc:     tipbuild@zytor.com, Ingo Molnar <mingo@kernel.org>, lkp@01.org,
        LKML <linux-kernel@vger.kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Fengguang Wu <fengguang.wu@intel.com>
Subject: Re: [LKP] [x86/hotplug] e1056a25da:
 WARNING:at_arch/x86/kernel/apic/apic.c:#setup_local_APIC
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References: <20190620021856.GP7221@shao2-debian> <alpine.DEB.2.21.1906212108150.5503@nanos.tec.linutronix.de> <58ea508f-dc2e-8537-fe96-49cca0a7c799@intel.com> <alpine.DEB.2.21.1906250821220.32342@nanos.tec.linutronix.de> <f5c36f89-61bf-a82e-3d3b-79720b2da2ef@intel.com>
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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
   2) The config file
   3) The exact kvm-qemu version

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

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