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

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Date:   Fri, 22 Dec 2017 21:31:28 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Alexandru Chirvasitu <achirvasub@...il.com>,
        Dou Liyang <douly.fnst@...fujitsu.com>
CC:     Thomas Gleixner <tglx@...utronix.de>, 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 (Cloudbase Solutions SRL)" <v-micos@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Marc Zyngier <marc.zyngier@....com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Haiyang Zhang <haiyangz@...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" <devel@...uxdriverproject.org>,
        KY Srinivasan <kys@...rosoft.com>
Subject: RE: PROBLEM: 4.15.0-rc3 APIC causes lockups on Core 2 Duo laptop

> From: Alexandru Chirvasitu [mailto:achirvasub@...il.com]
> Sent: Friday, December 22, 2017 06:21
> 
> In the absence of logs, the best I can do at the moment is attach a
> picture of the screen I am presented with on the apic=debug boot
> attempt.
> Alex

The panic happens in irq_matrix_assign_system+0x4e/0xd0 in your picture.
IMO we should find which line of code causes the panic. I suppose
"objdump -D kernel/irq/matrix.o" can help to do that.

Thanks,
-- Dexuan