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
