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Message-ID: <20160524090455.GF3192@twins.programming.kicks-ass.net> Date: Tue, 24 May 2016 11:04:55 +0200 From: Peter Zijlstra <peterz@...radead.org> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: linux-kernel@...r.kernel.org, mgalbraith@...e.de, ahh@...gle.com, bsegall@...gle.com, torvalds@...ux-foundation.org, matt@...eblueprint.co.uk, morten.rasmussen@....com, pjt@...gle.com, pkondeti@...radead.org, tglx@...utronix.de, byungchul.park@....com, mingo@...nel.org, rgkernel@...il.com Subject: Re: Bisection: Lost wakeups from b5179ac70de8 On Mon, May 23, 2016 at 07:04:10AM -0700, Paul E. McKenney wrote: > Hello, Peter, > > Current mainline doesn't do well with RCU torture testing, and the > symptom once again looks like lost wakeups. Thankfully, this time each > run takes only about an hour, and the false-positive/-negative rate > is negligible. This means that for the first time ever, "git bisect" > actually did something useful for me. The first bad commit is: > > b5179ac70de8 ("sched/fair: Prepare to fix fairness problems on migration"). > Yeah, we have a patch for that.. I'll go writes a Changelog for it and put it to sched/urgent. See lkml.kernel.org/r/20160523091907.GD15728@...ktop.ger.corp.intel.com
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