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Instead of overloading qmp_dispatcher_co_busy, make the coroutine pointer NULL. This will make things break spectacularly if somebody tries to start a request after monitor_cleanup(). AIO_WAIT_WHILE_UNLOCKED() does not need qatomic_mb_read(), because the macro contains all the necessary memory barriers. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>