linux-kernel - Re: PROBLEM: 4.15.0-rc3 APIC causes lockups on Core 2 Duo laptop

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Message-ID: <20171228172250.GD10658@chirva-slack.chirva-slack>
Date:   Thu, 28 Dec 2017 12:22:50 -0500
From:   Alexandru Chirvasitu <achirvasub@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Dou Liyang <douly.fnst@...fujitsu.com>,
        Pavel Machek <pavel@....cz>,
        kernel list <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "Maciej W. Rozycki" <macro@...ux-mips.org>,
        Mikael Pettersson <mikpelinux@...il.com>,
        Josh Poulson <jopoulso@...rosoft.com>,
        Mihai Costache <v-micos@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Marc Zyngier <marc.zyngier@....com>, linux-pci@...r.kernel.org,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Simon Xiao <sixiao@...rosoft.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Jork Loeser <Jork.Loeser@...rosoft.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        devel@...uxdriverproject.org, KY Srinivasan <kys@...rosoft.com>
Subject: Re: PROBLEM: 4.15.0-rc3 APIC causes lockups on Core 2 Duo laptop

On Thu, Dec 28, 2017 at 05:10:28PM +0100, Thomas Gleixner wrote:
> On Thu, 28 Dec 2017, Alexandru Chirvasitu wrote:
> > Actually, it decided to cooperate for just long enough for me to get
> > the dmesg out. Attached.
> > 
> > This is from the kernel you asked about: Dou's patch + yours, i.e. the
> > latest one in that git log I just sent, booted up with 'apic=debug'.
> 
> Ok. As I suspected that warning does not trigger. I would have been
> massively surprised if that happened. So Dou's patch is just a red herring
> and just might change the timing enough to make the problem 'hide'.
> 
> Can you try something completely different please?
> 
> Just use plain Linus tree without any additional patches on top and disable
> CONFIG_NO_HZ_IDLE, i.e. select CONFIG_HZ_PERIODIC.
> 
> If that works, then reenable it and add 'nohz=off' to the kernel command
> line.
>

No go here I'm afraid:

Linus' clean 4.15-rc5 compiled with CONFIG_HZ_PERIODIC exhibits the
familiar behaviour: lockups, sometimes instant upon trying to log in,
sometimes logging me in and freaking out seconds later.

Attached config for verification.


> Thanks,
> 
> 	tglx
> 

View attachment "config-4.15.0-rc5-hz" of type "text/plain" (194520 bytes)