netdev - Re: [PATCH]: Add Network Sysrq Support

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Message-ID: <20110621100858.70c23a93@nehalam.ftrdhcpuser.net>
Date:	Tue, 21 Jun 2011 10:08:58 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, agospoda@...hat.com,
	nhorman@...hat.com, lwoodman@...hat.com
Subject: Re: [PATCH]: Add Network Sysrq Support

On Tue, 21 Jun 2011 09:00:40 -0400
Prarit Bhargava <prarit@...hat.com> wrote:

> Add Network Sysrq Support
> 
> In some circumstances, a system can hang/lockup in such a way that the system
> is completely unresponsive to keyboard or console input but is still
> responsive to ping.  The config option, CONFIG_SYSRQ_PING, builds
> net/ipv4/sysrq-ping.ko which allows a root user to configure the system for
> a remote sysrq.
> 
> To use this do:
> 
> mount -t debugfs none /sys/kernel/debug/
> echo 1 > /proc/sys/kernel/sysrq
> echo <hex digit val> > /sys/kernel/debug/network_sysrq_magic
> echo 1 > /sys/kernel/debug/network_sysrq_enable
> 
> Then on another system on the network you can do:
> 
> ping -c 1 -p <up to 30 hex digit val><hex val of sysrq> <target_system_name>
> 
> ex) sysrq-m, m is ascii 0x6d
> 
> ping -c 1 p 1623a06f554d46d676d <target_system_name>
> 
> Note that the network sysrq automatically disables after the receipt of
> the ping, ie) it is single-shot mode.  If you want to use this again, you
> must complete the above four steps again.
> 
> Signed-off-by: Prarit Bhargava <prarit@...hat.com>

Isn't same functionality already available with netconsole?
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