Possible regression due to "tick: broadcast: Prevent livelock from event handler"

[Wolfram Sang]

> So this is a single core machine and uses the em_sti timer w/o the
> broadcast nonsense. In Simons case it looks like em_sti is used as
> broadcast device.

We use the same board. Just my kernel has SMP=n.

> Though the issues you see in the highres=n case might be the same as
> the ones Simon is observing.

I hope so. One good thing about the issue I see is that it is 100%
reproducable.

> So in that nohz=y highres=n case, does adding idle=poll on the command
> line fix the issue?

Nope, still hangs.

Thanks for assisting!

   Wolfram

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