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Date: Sun, 21 Dec 2014 14:19:03 -0800
Message-ID: <CA+55aFwA7uOFgb-Y4dHS099HuoV+oQvxXf+cfZYh9T7H_c0PHA@mail.gmail.com>
Subject: Re: frequent lockups in 3.18rc4
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Dave Jones <davej@redhat.com>, Chris Mason <clm@fb.com>,
        Mike Galbraith <umgwanakikbuti@gmail.com>,
        Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>,
        =?UTF-8?Q?D=C3=A2niel_Fraga?= <fragabr@gmail.com>,
        Sasha Levin <sasha.levin@oracle.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Suresh Siddha <sbsiddha@gmail.com>, Oleg Nesterov <oleg@redhat.com>,
        Peter Anvin <hpa@linux.intel.com>
Content-Type: text/plain; charset=UTF-8
Sender: linux-kernel-owner@vger.kernel.org

On Sun, Dec 21, 2014 at 1:22 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> So the range of 1-251 seconds  is not entirely random. It's all in
> that "32-bit HPET range".

DaveJ, I assume it's too late now, and you don't effectively have any
access to the machine any more, but "hpet=disable" or "nohpet" on the
command line might be worth trying if you ever see that piece of
hardware again.

And for posterity, do you have a dmidecode with motherboard/BIOS
information for the problematic machine? And your configuration?

And finally, and stupidly, is there any chance that you have anything
accessing /dev/hpet?

                       Linus
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