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Date:   Tue, 19 Feb 2019 22:01:45 +0100 (CET)
From:   Thomas Gleixner <tglx@linutronix.de>
To:     Hans de Goede <hdegoede@redhat.com>
cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Borislav Petkov <bp@alien8.de>,
        Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: False positive "do_IRQ: #.55 No irq handler for vector" messages
 on AMD ryzen based laptops
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References: <95e76875-f6b2-cbea-cd74-dc14ee77b2f8@redhat.com>
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Hans,

On Tue, 19 Feb 2019, Hans de Goede wrote:

Cc+: ACPI/AMD folks

> 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.

Sigh, that looks like BIOS value add again.

It's not a false positive. Something _IS_ sending a vector 55 to these CPUs
for whatever reason.

> 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.

Can you please enable CONFIG_GENERIC_IRQ_DEBUGFS and dig in the files there
whether vector 55 is used on CPU0 and which device is associated to that.

I bet its a legacy IRQ and as that space starts at 48 (IRQ0) this should be
IRQ9 which is usually - DRUMROLL - the ACPI interrupt.

The kernel clearly sets that up to be delivered to CPU 0 only, but I've
seen that before that the BIOS value add thinks that this setup is not
relevant.

/me goes off and sings LALALA

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

As a least resort. root ssh - SHUDDER - Ooops now I spilled my preferred
password for that :)

Thanks,

	tglx