Subject: Re: NMI watchdog question
From: Pallai Roland <dap@mail.index.hu>
To: linux-kernel@vger.kernel.org
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Date: Sun, 06 Mar 2005 19:51:40 +0100
Message-Id: <1110135101.8018.173.camel@localhost.localdomain>
Mime-Version: 1.0
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 904
Lines: 26


Robert Hancock wrote:
>> Pallai Roland wrote:
>> [...]
>> I'm playing with the NMI watchdog (nmi_watchdog=1) on a reproductable
>> hard lockup (no keyboard, etc) but seems like it doesn't works and I
>> can't understand why, please explain to me the possible causes.. I
>> belive it should work in this situation..
>
> The NMI watchdog only triggers if something is blocking interrupts from
> getting through - if timer interrupts are still happening it won't
> activate. You can try Alt-Sysrq-T to get a traceback of where the
> current process is stuck..

 the keyboard is dead (no num lock, no sysrq) just like the serial port,
the network, etc..


--
 d

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/