* linux-3.7.1: disable and reenable NMI watchdog => panic
@ 2013-01-06 17:44 Alexander E. Patrakov
2013-01-06 17:53 ` Alexander E. Patrakov
0 siblings, 1 reply; 3+ messages in thread
From: Alexander E. Patrakov @ 2013-01-06 17:44 UTC (permalink / raw)
To: linux-kernel
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Hi.
As illustrated by the attached screen photo (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, it just
locks up). 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.
--
Alexander E. Patrakov
[-- Attachment #2: KernelPanic.jpg --]
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: linux-3.7.1: disable and reenable NMI watchdog => panic
2013-01-06 17:44 linux-3.7.1: disable and reenable NMI watchdog => panic Alexander E. Patrakov
@ 2013-01-06 17:53 ` Alexander E. Patrakov
2013-01-11 13:34 ` Borislav Petkov
0 siblings, 1 reply; 3+ messages in thread
From: Alexander E. Patrakov @ 2013-01-06 17:53 UTC (permalink / raw)
To: linux-kernel
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: linux-3.7.1: disable and reenable NMI watchdog => panic
2013-01-06 17:53 ` Alexander E. Patrakov
@ 2013-01-11 13:34 ` Borislav Petkov
0 siblings, 0 replies; 3+ messages in thread
From: Borislav Petkov @ 2013-01-11 13:34 UTC (permalink / raw)
To: Alexander E. Patrakov; +Cc: linux-kernel
On Sun, Jan 06, 2013 at 11:53:41PM +0600, Alexander E. Patrakov wrote:
> 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/
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=3935e89505a1c3ab3f3b0c7ef0eae54124f48905
should fix it.
See also thread here: http://marc.info/?i=20130109120732.GA8016@liondog.tnic
HTH.
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2013-01-11 13:34 UTC | newest]
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2013-01-06 17:44 linux-3.7.1: disable and reenable NMI watchdog => panic Alexander E. Patrakov
2013-01-06 17:53 ` Alexander E. Patrakov
2013-01-11 13:34 ` Borislav Petkov
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