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    SubjectRe: [PATCH 08/10] um: Fix possible race on task->mm
    Am 24.03.2012 11:30, schrieb Anton Vorontsov:
    > Checking for task->mm is dangerous as ->mm might disappear (exit_mm()
    > assigns NULL under task_lock(), so tasklist lock is not enough).
    > We can't use get_task_mm()/mmput() pair as mmput() might sleep,
    > so let's take the task lock while we care about its mm.
    > Note that we should also use find_lock_task_mm() to check all process'
    > threads for a valid mm, but for uml we'll do it in a separate patch.
    > Signed-off-by: Anton Vorontsov <>

    Acked-by: Richard Weinberger <>


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