 - Hold the page queues lock when performing vm_page_busy() or    vm_page_flag_set().  - Replace vm_page_sleep_busy() with proper page queues locking    and vm_page_sleep_if_busy().
 - Hold the page queues lock when performing vm_page_busy() or
   vm_page_flag_set().
 - Replace vm_page_sleep_busy() with proper page queues locking
   and vm_page_sleep_if_busy().

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