Re: BUG: "do_IRQ: 0.39 No irq handler for vector" from a 16550 port

[Thomas Gleixner]

On Fri, 2 Nov 2018, Holger Schurig wrote:

> I said that kernel 4.9 doesn't show the issue. The same was for later
> kernels up to 4.13.
> 
> I had a compilation issue with 4.14 (which I later solved, something
> unrelated with tools/objcopy when compiling for a different
> architecture), so I did a git bisect between v4.13 and v4.15. This is
> the outcome:
>
> git bisect bad 464d12309e1b5829597793db551ae8ecaecf4036
> # first bad commit: [464d12309e1b5829597793db551ae8ecaecf4036] x86/vector: Switch IOAPIC to global reservation mode

Which is not surprising because the old model just hid the issue of
interrupts which came in after the interrupt had been torn down.

I have no idea what causes this, but it seems to be related to the
particular hardware/BIOS combination.

Thanks,

	tglx