Running an Intel S2600ST motherboard with dual Gold 6148 I get this
error regularly after the last kernel update I did.

The number before the dot seems to be a CPU number since I see many varied 
numbers and there's 40 cores/80 threads on my motherboard
e.g.
[Wed Dec 26 14:20:25 2018] do_IRQ: 14.216 No irq handler for vector
[Wed Dec 26 18:35:32 2018] do_IRQ: 46.40 No irq handler for vector
[Thu Dec 27 00:56:21 2018] do_IRQ: 15.55 No irq handler for vector
(there are 37 of these over the last 2 weeks)

There's no /sys/kernel/debug/irq/ folder

The current kernel on "Ubuntu 16.04.5 LTS" I am using is
"vmlinuz-4.4.0-140-generic"

I updated from "vmlinuz-4.4.0-119-generic" (which was also 16.04 LTS)

I've had this server for over a year and with the 4.4.0-140 update is
the first time I've seen this.

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https://bugs.launchpad.net/bugs/1781016

Title:
  Slow flood of do_IRQ: No irq for vector

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