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

[Feng Tang <feng.tang@intel.com>]

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Hi Thomas,

On Mon, Jul 01, 2019 at 09:13:54AM +0200, Thomas Gleixner wrote:
> Feng,
> 
> On Sun, 30 Jun 2019, Thomas Gleixner wrote:
> > On Sun, 30 Jun 2019, Feng Tang wrote:
> > > On Sun, Jun 30, 2019 at 01:35:39PM +0200, Thomas Gleixner wrote:
> > > > On Sat, 29 Jun 2019, Thomas Gleixner wrote:
> > > > > On Fri, 28 Jun 2019, Thomas Gleixner wrote:
> > > > > > On Fri, 28 Jun 2019, Feng Tang wrote:
> > > > > > That function just 'works' by chance not by design. I'll stare into it and
> > > > > > fix it up for real.
> > > > > > 
> > > > > > Thank you very much for that information. Your debug was spot on!
> > > > > 
> > > > > I rewrote that function so it actually handles that case correctly along
> > > > > with some other things which were broken and force pushed the WIP.x86/ipi
> > > > > branch.
> > > > > 
> > > > > Can you please run exactly that test again against that new version and
> > > > > verify that this is fixed now?
> > > > 
> > > > Just found another issue with that thing. Don't waste your time on it. I'll
> > > > come back to you when I'm done.
> > > 
> > > Ok. I noticed that the ipi branch has been merged to tip/master.
> > 
> > Yes, but it will be zapped there as well.
> 
> In case you still have your debug version (that old tree which triggered
> the warn) around, could you please run that again and add
> 
>     'lapic=notscdeadline'
> 
> to the kernel command line please?

After adding the boot paramter, the result is the same. The dmesg is attached.

Thanks,
Feng

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