linux-kernel - Re: linux-3.7.1: disable and reenable NMI watchdog => panic

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Message-ID: <CAN_LGv1L3RLrwnzdN7oYM8ewjRoptGuK-4wQ9+oXWd+NK9CgNw@mail.gmail.com>
Date:	Sun, 6 Jan 2013 23:53:41 +0600
From:	"Alexander E. Patrakov" <patrakov@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: linux-3.7.1: disable and reenable NMI watchdog => panic

Hi.

As illustrated by the screen photo [1] (sorry for bad quality),
disabling and then reenabling the NMI watchdog panics the kernel
(3.7.1). This is reproducible in qemu-kvm as well, but I could not get
the nice panic message to pop up there (most of the time, the real
machine just locks up, too). This bug is rather important, as
laptop-mode-tools, by default, try to reenable this NMI watchdog when
AC power appears, and this is how I caught the bug the first time.

[1] http://postimage.org/image/mjjifj1ip/

-- 
Alexander E. Patrakov
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