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SubjectRe: Lockup in tracepoint unregister in sched switch ftrace plugin
On Tue, Oct 21, 2008 at 12:14:03AM -0400, Steven Rostedt wrote:
>
>
> [ Paul, Thomas, wake up ]

I am awake, but fortunately for me, Ingo woke up before I did. ;-)

(Sorry, couldn't resist...)

Thanx, Paul

> On Mon, 20 Oct 2008, Steven Rostedt wrote:
> >
> > which calls unregister_trace_sched_switch define as macro to:
> >
> > kernel/tracepoint.c: tracepoint_probe_unregister
> > " " : remove_tracepoint
> > kernel/rcupdate.c: rcu_barrier_sched
> > " " : _rcu_barrier
> >
> > where it gets stuck at that "wait_for_completion".
> >
> > I'm not sure if, because this is a scheduler trace point that we are
> > hitting some kind of race that is preventing the wait_for_completion to
> > finish, or what.
>
> Note, I just booted this kernel with CONFIG_NOHZ=n and it booted fine.
> This looks like a bug somewhere in tracepoints/RCU/dynamic-ticks
>
> -- Steve
>


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