linux-kernel - Re: lapic-related boot crash in 4.15-rc1

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Message-ID: <alpine.DEB.2.20.1801101931590.1919@nanos>
Date:   Wed, 10 Jan 2018 19:34:19 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Meelis Roos <mroos@...ux.ee>
cc:     Ingo Molnar <mingo@...nel.org>,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        x86@...nel.org, Dou Liyang <douly.fnst@...fujitsu.com>
Subject: Re: lapic-related boot crash in 4.15-rc1

On Wed, 10 Jan 2018, Meelis Roos wrote:
> On 3 of my test computers, boot hangs with 4.15 git kernels. So far I 
> have traced it down to 4.14.0 being good and 4.15-rc1 being bad (bisect 
> is slow because the computers are somwehat remote). Also because of 
> trying to find when it started, I have not tries newer than rc5 
> kernels.
> 
> The hang happens after Performance Events feature table has been printed 
> but before APIC initialization messages normally appear ("Enabling APIC 
> mode:  Flat.  Using 0 I/O APICs" or something like that).
> 
> It happens on at least 3 distinct computers:
> * AMD Athlon with AMD 750 chipset
> * P3 1 GHz with i815 chipset
> * P4 1.7 GHz with SiS chipset
> 
> They all have have "lapic" parameter because they were telling me that 
> lapic has been disabled by BIOS and I re-enabled it with the parameter 
> to get apic timer interrupts. This worked up until 4.14.
> 
> None of the computers have IO-APICs.

Oh. Then it possibly falls into Dou's realm.

Dou?

Thanks,

	tglx