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Message-Id: <81C80BF10115AEsugaken.r3@gmail.com>
Date: Thu, 11 Oct 2007 19:25:11 +0900
From: Ken Sugawara <sugaken.r3@...il.com>
To: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: wim@...ana.be, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] softdog - panic instead of reboot, kernel 2.6.22.9
Alan Cox <alan@...rguk.ukuu.org.uk> writes:
>> analysis. Provided that timer interrupts are not blocked, this patch
>> might enable them to get a crash dump in such a situation by activating
>> softdog.
>
>You want the NMI based anti lockup stuff for that. If the box locks up
>then generally softdog will fail. The NMI based debug
>(CONFIG_DETECT_SOFTLOCKUP) is the option you want.
Thanks for your comment. I'll look into it, but unfortunately, most of
our customers are running much older kernels (e.g. 2.6.9-based from
RHEL4.x) which don't have the option, and some non-negligible number of
them are running on non-IA platforms, whereas right now the option seems
to be implemented only in i386 and x86_64 (correct me if I'm wrong).
Anyways, I'll try to look for a way to manually trigger NMI on their non
-IA boxes, preferably without any additional hardware.
Regards,
Ken
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