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    SubjectRe: [PATCH 2/2] Futex non-page-pinning fix
    What happens after this sequence:

    1. process A forks, making process B
    2. B does FUTEX_FD, or splits into threads and one does FUTEX_WAIT,
    on a private page that has not been written to since the fork
    3. A does FUTEX_WAIT on the same address
    3. The page is swapped out
    4. B does FUTEX_WAKE at the same address

    Won't the futex be hashed on the swap entry at step 4, so that
    both processes are woken, yet only the waiter in B should be woken?

    Related: could COW sharing after fork() explain the spurious wakeups I
    saw mentioned earlier in the thread?

    -- Jamie
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