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    SubjectRe: [PATCH 3/8] arm: Fix possible race on task->mm
    On Wed, Feb 08, 2012 at 05:08:08PM +0100, Oleg Nesterov wrote:
    > On 02/07, Anton Vorontsov wrote:
    > >
    > > 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,
    >
    > Yes, but
    >
    > > so let's take the task lock while we care about its mm.
    >
    > it seems that this needs find_lock_task_mm() too ?
    >
    > the same for the rest patches in this series.

    Yep, I think you're right, will add this change.

    --
    Anton Vorontsov
    Email: cbouatmailru@gmail.com


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