linux-kernel - Re: [BUG?] INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 0-.... } 3 jiffies s: 309 root: 0x1/.

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Message-ID: <CALjTZva=JHsckrBeHgJcd-_TDMgYgmZGcXavJ=GhPr7VQCOF5g@mail.gmail.com>
Date:   Thu, 13 Apr 2023 16:32:32 +0100
From:   Rui Salvaterra <rsalvaterra@...il.com>
To:     paulmck@...nel.org
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>, rodrigo.vivi@...el.com,
        tvrtko.ursulin@...ux.intel.com, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG?] INFO: rcu_sched detected expedited stalls on CPUs/tasks: {
 0-.... } 3 jiffies s: 309 root: 0x1/.

Hi, Paul,

On Thu, 13 Apr 2023 at 15:43, Paul E. McKenney <paulmck@...nel.org> wrote:
>
> My guess would be that you have CONFIG_RCU_EXP_CPU_STALL_TIMEOUT set to
> some small non-zero number, for example, you might have set up a recent
> Android .config or some such.  The default of zero would give you about
> 21 seconds rather than the three jiffies that you are seeing.
>
> Could you please check your .config?

Well, this is embarrassing. I can't fathom why/how, but I had it set
to 20, on this machine. That is, 20 millisseconds. I guess its a
miracle I haven't seen *more* expedited RCU traces. Sorry for the
noise, everyone.

Kind regards,
Rui