Re: `do_IRQ: 1.55 No irq handler for vector` on ASRock E350M1

From: Tom Lendacky
Date: Mon Feb 26 2018 - 11:42:38 EST


On 2/26/2018 10:37 AM, Morton, Eric wrote:
> Thomas,
>
> Yazen dug out PLAT-21393 as sounding like this issue. I haven't had a chance to digest it.

Yes, internally to AMD, that was the bug that tracked the issue I was
referring to.

Thanks,
Tom

>
> Eric
>
> ïOn 2/26/18, 10:31 AM, "Borislav Petkov" <bp@xxxxxxxxx> wrote:
>
> On Mon, Feb 26, 2018 at 10:14:10AM -0600, Tom Lendacky wrote:
> > On 2/24/2018 2:59 AM, Thomas Gleixner wrote:
> > > On Sat, 24 Feb 2018, Paul Menzel wrote:
> > >> Am 23.02.2018 um 20:09 schrieb Borislav Petkov:
> > >>> On Fri, Feb 23, 2018 at 07:18:34PM +0100, Thomas Gleixner wrote:
> > >>>> Borislav is seeing similar issues on larger AMD machines. The interrupt
> > >>>> seems to come from BIOS/microcode during bringup of secondary CPUs and we
> > >>>> have no idea why.
> > >>>
> > >>> Paul, can you boot 4.14 and grep your dmesg for something like:
> > >>>
> > >>> [ 0.000000] spurious 8259A interrupt: IRQ7. >
> > >>> ?
> > >>
> > >> No, I do not see that. Please find the logs attached.
> > >
> > > From your 4.14 log:
> > >
> > > Feb 19 09:48:06.843173 kodi kernel: CPU 0 irqstacks, hard=e9b0a000 soft=e9b0c000
> > > Feb 19 09:48:06.843216 kodi kernel: spurious 8259A interrupt: IRQ7.
> >
> > I think I remember seeing something like this previously and it turned out
> > to be a BIOS bug. All the AP's were enabled to work with the legacy 8259
> > interrupt controller. In an SMP system, only one processor in the system
> > should be configured to handle legacy 8259 interrupts (ExtINT delivery
> > mode - see Intel's SDM, Volume 3, section 10.5.1, Delivery Mode). Once
> > the BIOS was fixed, the spurious interrupt message went away.
> >
> > I believe at some point during UEFI, the APs were exposed to an ExtINT
> > interrupt. Since they were configured to handle ExtINT delivery mode and
> > interrupts were not yet enabled, the interrupt was left pending. When the
> > APs were started by the OS and interrupts were enabled, the interrupt
> > triggered. Since the original pending interrupt was handled by the BSP,
> > there was no longer an interrupt actually pending, so the 8259 responds
> > with IRQ 7 when queried by the OS. This occurred for each AP.
>
> Interesting - is this something that can happen on Zen too?
>
> Because I have such reports too.
>
> --
> Regards/Gruss,
> Boris.
>
> Good mailing practices for 400: avoid top-posting and trim the reply.
>
>