linux-kernel - False positive "do_IRQ: #.55 No irq handler for vector" messages on AMD ryzen based laptops

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Date:   Tue, 19 Feb 2019 16:53:41 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: False positive "do_IRQ: #.55 No irq handler for vector" messages on
 AMD ryzen based laptops

Hi Thomas,

Various people are reporting false positive "do_IRQ: #.55 No irq handler for vector"
messages on AMD ryzen based laptops, see e.g.:

https://bugzilla.redhat.com/show_bug.cgi?id=1551605

Which contains this dmesg snippet:

Feb 07 20:14:29 localhost.localdomain kernel: smp: Bringing up secondary CPUs ...
Feb 07 20:14:29 localhost.localdomain kernel: x86: Booting SMP configuration:
Feb 07 20:14:29 localhost.localdomain kernel: .... node  #0, CPUs:      #1
Feb 07 20:14:29 localhost.localdomain kernel: do_IRQ: 1.55 No irq handler for vector
Feb 07 20:14:29 localhost.localdomain kernel:  #2
Feb 07 20:14:29 localhost.localdomain kernel: do_IRQ: 2.55 No irq handler for vector
Feb 07 20:14:29 localhost.localdomain kernel:  #3
Feb 07 20:14:29 localhost.localdomain kernel: do_IRQ: 3.55 No irq handler for vector
Feb 07 20:14:29 localhost.localdomain kernel: smp: Brought up 1 node, 4 CPUs
Feb 07 20:14:29 localhost.localdomain kernel: smpboot: Max logical packages: 1
Feb 07 20:14:29 localhost.localdomain kernel: smpboot: Total of 4 processors activated (15968.49 BogoMIPS)

It seems that we get an IRQ for each CPU as we bring it online,
which feels to me like it is some sorta false-positive.

I temporarily have access to a loaner laptop for a couple of weeks which shows
the same errors and I would like to fix this, but I don't really know how to
fix this.

Note if you want I can set up root ssh-access to the laptop.

Regards,

Hans