On Thu, May 15, 2014 at 10:43:14AM -0700, [email protected] wrote: > I just did notice however that sched_cfs_period_timer reads > cfs_b->period without any locks, which can in fact race with an update > to period (and isn't fixed by this patch). If this write doesn't happen > to be atomic (which is certainly not guaranteed, and is entirely > plausible on say 32-bit x86, much less other archs), we could read a > partially written value and move the timer incorrectly. Pulling the > lock/unlock out of do_sched_cfs_period_timer should fix this easily > enough. > > unthrottle_offline_cfs_rqs could cause similar issues with its unlocked > read of quota, and can also be easily fixed.
Ben, will you send patches for this?
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