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Subject: Re: PROBLEM: 4.15.0-rc3 APIC causes lockups on Core 2 Duo laptop
To: Thomas Gleixner <tglx@linutronix.de>,
        Alexandru Chirvasitu <achirvasub@gmail.com>
CC: Pavel Machek <pavel@ucw.cz>,
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From: Dou Liyang <douly.fnst@cn.fujitsu.com>
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Date: Wed, 20 Dec 2017 11:58:57 +0800
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Hi Thomas,

At 12/20/2017 08:31 AM, Thomas Gleixner wrote:
> On Tue, 19 Dec 2017, Alexandru Chirvasitu wrote:
> 
>> I had never heard of 'bisect' before this casual mention (you might tell
>> I am a bit out of my depth). I've since applied it to Linus' tree between
> 
>> bebc608 Linux 4.14 (good)
>>
>> and
>>
>> 4fbd8d1 Linux 4.15-rc1 (bad)
> 
> Is Linus current head 4.15-rc4 bad as well?
> 
[...]
> 
> Thanks for doing that bisect, but unfortunately this commit cannot be the
> problematic one, It merily adds a config symbol, but it does not change any
> code at all. It has no effect whatsoever. So something might have gone
> wrong in your bisecting.
> 

Agree.

> I CC'ed Dou Liyang. He has changed the early APIC setup code and there has
> been an issue reported already. Though I lost track of that. Dou, any
        ^^^^^^^^  Is it this one?
                    https://marc.info/?l=linux-kernel&m=151188084018443
> pointers?
> 

Not sure, but seems the APIC failed to start in that 32-bit system.

I will look into it.

Alex,

Could you give me your .config file and the dmesg-log of 4.15.0-rc3.

Thanks,
	dou