Re: lockdep splat in CPU hotplug

[Daniel Lezcano]

On 10/22/2014 11:53 AM, Jiri Kosina wrote:
> On Tue, 21 Oct 2014, Jiri Kosina wrote:
>
> > Hi,
> >
> > I am seeing the lockdep report below when resuming from suspend-to-disk
> > with current Linus' tree (c2661b80609).
> >
> > The reason for CCing Ingo and Peter is that I can't make any sense of one
> > of the stacktraces lockdep is providing.
> >
> > Please have a look at the very first stacktrace in the dump, where lockdep
> > is trying to explain where cpu_hotplug.lock#2 has been acquired. It seems
> > to imply that cpuidle_pause() is taking cpu_hotplug.lock, but that's not
> > the case at all.
> >
> > What am I missing?
>
> Okay, reverting 442bf3aaf55a ("sched: Let the scheduler see CPU idle
> states") and followup 83a0a96a5f26 ("sched/fair: Leverage the idle state
> info when choosing the "idlest" cpu") which depends on it makes the splat
> go away.

Are you able to reproduce it by offlining the cpu and onlining it again ?

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