while we are getting rid of Giant, current race condition between softclock() and callout_stop() is unacceptable. the race causes two many places in source code would be modified to fit this new behaviour, besides this, everywhere callout_stop() is used need to hold sched_lock and do a mi_switch() and modify td_flags is also unacceptable, this SMP race should be resolved in kern_timeout.c.
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