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

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Message-Id: <20180129095738.GU3741@linux.vnet.ibm.com>
Date:   Mon, 29 Jan 2018 01:57:38 -0800
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Sebastian Sewior <bigeasy@...utronix.de>
Cc:     Thomas Gleixner <tglx@...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, 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.

							Thanx, Paul