linux-kernel - Re: Does sysrq break something?

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Date:	Sun, 10 Aug 2008 13:29:24 -0400 (EDT)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
cc:	linux-kernel@...r.kernel.org
Subject: Re: Does sysrq break something?

On Monday 2008-05-12 14:16, Tetsuo Handa wrote:
>Hello.
>
>I'm trying to get a sysrq dump when the system hangs.
>But unfortunately, typing sysrq key from the keyboard
>doesn't work after the system hangs.
>So, I'm trying to get a sysrq dump by automatically
>writing to /proc/sysrq-trigger using a program.

(a) make sure sysrq-over-keyboard is enabled
(b) if the system does not react to sysrq, it is unlikely
it is servicing any processes at all
(c) try xt_SYSRQ (xtables-addons 1.5.5), to hopefully
trigger sysrq over the network (receive routine may run
in interrupt context).

>In other words, does invoking sysrq routine break or taint something?

No.
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