On Wed, 6 Nov 2019, Oleg Nesterov wrote: > > I think that (with or without this fix) handle_exit_race() logic needs > cleanups, there is no reason for get_futex_value_locked(), we can drop > ->pi_lock right after we see PF_EXITPIDONE. Lets discuss this later. Which still is in atomic because the hash bucket lock is held, ergo get_futex_value_locked() needs to stay for now. So the only thing we could do is to reduce the pi_lock held section a bit. Thanks, tglx
