linux-kernel - Re: [PATCH V2] kernel/watchdog: fix spurious hard lockups

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Message-ID: <CA+55aFwFr4tDeVH+G7QwFWV+rUdDLQTvFrPX+ZT3wOx4Ew5tMw@mail.gmail.com>
Date:   Mon, 14 Aug 2017 18:28:01 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Liang, Kan" <kan.liang@...el.com>
Cc:     Don Zickus <dzickus@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "babu.moger@...cle.com" <babu.moger@...cle.com>,
        "atomlin@...hat.com" <atomlin@...hat.com>,
        "prarit@...hat.com" <prarit@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "eranian@...gle.com" <eranian@...gle.com>,
        "acme@...hat.com" <acme@...hat.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH V2] kernel/watchdog: fix spurious hard lockups

On Mon, Aug 14, 2017 at 6:16 PM, Liang, Kan <kan.liang@...el.com> wrote:
>
> We have confirmed that the hardlock with "speed up the hrtimer" patch is
> actually another issue.

Good.

However:

> Tim has already proposed a patch to fix it.
> Here is his patch. https://lkml.org/lkml/2017/8/14/1000

Ugh. I hate that patch, and hope we can find a proper fix for it. But
I'll respond separately to it, and it's independent of the watchdog
issue.

                  Linus