On Thu, Dec 31, 2015 at 09:56:28PM -0500, Tejun Heo wrote:

task_struct has a cluster of unsigned bitfields.  Some are updated
under scheduler locks while others are updated only by the task
itself.  Currently, the two classes of bitfields aren't distinguished
and end up on the same word which can lead to clobbering when there
are simultaneous read-modify-write attempts.  While difficult to prove
definitely, it's likely that the resulting inconsistency led to low
frqeuency failures such as wrong memcg_may_oom state or loadavg
underflow due to clobbered sched_contributes_to_load.

Ping.

-- 
tejun

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