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    SubjectRe: Linux 3.1-rc9
    On Tue, Oct 18, 2011 at 12:48 PM, Thomas Gleixner <> wrote:
    > It does not look related.

    Yeah, the only lock held there seems to be the socket lock, and it
    looks like all CPU's are spinning on it.

    > Could you try to reproduce that problem with
    > lockdep enabled? lockdep might make it go away, but it's definitely
    > worth a try.

    And DEBUG_SPINLOCK / DEBUG_SPINLOCK_SLEEP too. Maybe you're triggering
    some odd networking thing. It sounds unlikely, but maybe some error
    case you get into doesn't release the socket lock.

    I think PROVE_LOCKING already enables DEBUG_SPINLOCK, but the sleeping
    lock thing is separate, iirc.


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