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    SubjectRe: [PATCH 0/5] [GIT PULL] updates for tip/tracing/ftrace

    * Ingo Molnar <mingo@elte.hu> wrote:

    > found another, unrelated lockup with the event tracer:
    >
    > europe:/debug/tracing/events/sched/sched_wakeup_new> cat enable
    > 0
    > europe:/debug/tracing/events/sched/sched_wakeup_new> echo 1 > enable
    > europe:/debug/tracing/events/sched/sched_wakeup_new> sync
    > europe:/debug/tracing/events/sched/sched_wakeup_new> cat
    > ../../../trace_pipe
    > <...>-2870 [000] 688.730160: sched_wakeup_new: task
    > bash:2898 [120] success=1
    > <...>-2870 [001] 689.945375: sched_wakeup_new: task
    > bash:2899 [120] success=1
    >
    > [hard lockup]

    ok, tracked it down - it's the new trace_wake_up() from within
    wake_up_new_task() => bad idea.

    I think this was introduced via:

    6eaaa5d: tracing/core: use appropriate waiting on trace_pipe

    Ingo


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