linux-kernel - Re: [PATCH] hrtimer: Reset hrtimer cpu base proper on CPU hotplug

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Date:   Tue, 30 Jan 2018 22:03:17 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:     Sebastian Sewior <bigeasy@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] hrtimer: Reset hrtimer cpu base proper on CPU hotplug

On Mon, 29 Jan 2018, Paul E. McKenney wrote:

> On Mon, Jan 29, 2018 at 01:57:38AM -0800, Paul E. McKenney wrote:
> > On Mon, Jan 29, 2018 at 09:20:48AM +0100, Sebastian Sewior wrote:
> > > On 2018-01-26 14:09:17 [-0800], Paul E. McKenney wrote:
> > > > find this one.  ;-)  But it did pass rcutorture testing for a great many
> > > > years, didn't it?  :-/
> > > 
> > > It started to trigger better (or at all) on our test box with
> > > 	modprobe kvm_intel preemption_timer=n
> > > 
> > > on the host kernel so maybe a completely unrelated change helped to
> > > trigger this.
> > 
> > Good point!
> > 
> > And testing continues, currently at 108 hours of TREE01 without any
> > waylayed timers, so looking good!  ;-)
> > 
> > Just kicked off another 70 hours worth.
> 
> And those completed without incident for a total of 178 hours.  I believe
> we can call this one fixed.  Thank you all!!!
> 
> One question...  Is the patch shown below needed, or is this just yet
> another case of me being confused?  (The lack of it is not triggering,
> but...)

See commit 26456f87aca7