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    SubjectRe: [PATCH 2.6.27-rc5] Fix itimer/many thread hang.
    > As for this particular function, it seems to me that ->signal == NULL
    > is not possible, no?

    The concern is to make sure that the timer tick path is always safe for a
    tick that hits during release_task(current) in exit_notify(). A timer tick
    there can come with current->signal == NULL. We just need to make sure one
    way or another that this is safe.


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