On Fri, Oct 07, 2016 at 03:36:55AM +0200, Mike Galbraith wrote: > Seems this may be one of those not so theoretical races. A humongous > ppc64 box actually managed to run a task on two cores.. briefly. Cute :-) Why was you running a year old kernel on that box anyway? ;-) > Stable material methinks. Yep.. > On Fri, 2015-12-04 at 03:53 -0800, tip-bot for Peter Zijlstra wrote: > > Commit-ID: ecf7d01c229d11a44609c0067889372c91fb4f36 > > Gitweb: http://git.kernel.org/tip/ecf7d01c229d11a44609c0067889372c91fb4f36 > > Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > > AuthorDate: Wed, 7 Oct 2015 14:14:13 +0200 > > Committer: Ingo Molnar <mingo@xxxxxxxxxx> > > CommitDate: Fri, 4 Dec 2015 10:26:43 +0100 > > > > sched/core: Fix an SMP ordering race in try_to_wake_up() vs. schedule() > > > > Oleg noticed that its possible to falsely observe p->on_cpu == 0 such > > that we'll prematurely continue with the wakeup and effectively run p on > > two CPUs at the same time. -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html