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

Thomas Gleixner tglx at linutronix.de
Fri Jul 3 06:19:40 PDT 2015

On Fri, 3 Jul 2015, Wolfram Sang wrote:
> Hi Simon,
> > I have observed what appears to be a regression while testing next-20150702
> > which seems to be caused by 2951d5c031a3 ("tick: broadcast: Prevent
> > livelock from event handler").
> Does reverting help? I see a similar case with your branch
> renesas-devel-20150629-v4.1 which does not include both commits.

This branch has actually none of the clockevent/tick related changes
which are in next/linus tree. So 2951d5c031a3 is hardly the culprit.

> For this branch, if I select CONFIG_NO_HZ_IDLE and *no* CONFIG_HIGH_RES_TIMERS,

So with high res timers it boots. Can you please provide the output of
/proc/timer_list for that case?



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