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    SubjectRe: rcu: BUG: spinlock recursion on CPU#3, trinity-child19/5970
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    On Fri, 2012-06-29 at 23:40 +0200, Sasha Levin wrote:
    >
    > The bad news are that what you saw was a lockdep enabled run
    > (CONFIG_PROVE_RCU is enabled, and lockdep was enabled). There were no
    > lockdep warnings at any point while reproducing it.

    rcu_switch_from() -> rcu_preempt_note_context_switch() is called _after_
    the lockdep context switch annotation. Therefore lockdep things the prev
    task isn't holding any locks anymore.




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