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    SubjectRe: Weird rcu lockdep warning
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    From: Frederic Weisbecker <fweisbec@gmail.com>
    Date: Wed, 14 Apr 2010 02:02:27 +0200

    > I just have a guess though....
    > This seems to always happen from NMI path, and lockdep is disabled on NMI.
    > I suspect the lock_acquire() performed by rcu_read_lock() is just ignored
    > and then the rcu_read_lock_held() check has the wrong result...

    Yeah, I bet that's it too.

    lock_is_held() can't return anything meaningful while lockdep is
    disabled, which it is during NMIs.


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