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.




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