linux-kernel - Re: Long standing kernel warning: perfevents: irq loop stuck!

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Message-ID: <CAKA=qzY=F-wj8YXhb-B7RahNceeab0rSA=06qBc8+7V-SyY-+Q@mail.gmail.com>
Date:   Mon, 12 Aug 2019 11:57:46 -0700
From:   Josh Hunt <joshhunt00@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        "Liang, Kan" <kan.liang@...el.com>, jolsa@...hat.com,
        bigeasy@...utronix.de, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Long standing kernel warning: perfevents: irq loop stuck!

On Mon, Aug 12, 2019 at 10:55 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> On Mon, 12 Aug 2019, Josh Hunt wrote:
> > Was there any progress made on debugging this issue? We are still
> > seeing it on 4.19.44:
>
> I haven't seen anyone looking at this.
>
> Can you please try the patch Ingo posted:
>
>   https://lore.kernel.org/lkml/20150501070226.GB18957@gmail.com/
>
> and if it fixes the issue decrease the value from 128 to the point where it
> comes back, i.e. 128 -> 64 -> 32 ...
>
> Thanks,
>
>         tglx

I just checked the machines where this problem occurs and they're both
Nehalem boxes. I think Ingo's patch would only help Haswell machines.
Please let me know if I misread the patch or if what I'm seeing is a
different issue than the one Cong originally reported.

Thanks
-- 
Josh