linux-kernel - Re: timer-sp804: sched_clock: issue after first suspend

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Date:   Tue, 28 Nov 2017 17:43:33 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Abhishek Shah <abhishek.shah@...adcom.com>
cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        open list <linux-kernel@...r.kernel.org>, mingo@...hat.com,
        Peter Zijlstra <peterz@...radead.org>, deepa.kernel@...il.com,
        John Stultz <john.stultz@...aro.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Vikram Prakash <vikram.prakash@...adcom.com>
Subject: Re: timer-sp804: sched_clock: issue after first suspend

On Mon, 27 Nov 2017, Abhishek Shah wrote:
> Apart from this, I see following prints at times, can the above
> discussion be related to this behavior?
> [  320.448348] INFO: rcu_sched detected stalls on CPUs/tasks:
> [  320.454015]  3-...: (90 GPs behind) idle=162/140000000000001/0
> softirq=1220/1220 fqs=2462
> [  320.462540]  (detected by 1, t=5255 jiffies, g=518, c=517, q=37)
> [  320.468738] Task dump for CPU 3:
> [  320.472067] swapper/3       R  running task        0     0      1 0x00000022
> [  320.479341] Call trace:
> [  320.481869] [<ffff000008085828>] __switch_to+0x98/0xb0

I dont think so. That's an issue which plagues Paul McKenney for quite some
time. It's either caused by a timer not firing or a wakeup being lost. We
have no idea yet how to debug that.

Thanks,

	tglx