From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Haxby Subject: Re: [PATCH 1/2] netfilter: xtables: inclusion of xt_SYSRQ Date: Wed, 28 Apr 2010 16:50:16 +0100 Message-ID: <4BD85938.104@oracle.com> References: <1271845618-28569-1-git-send-email-jengelh@medozas.de> <1271845618-28569-2-git-send-email-jengelh@medozas.de> <4BCEF6B4.8090105@trash.net> <4BCEFACC.7020804@trash.net> <4BD84992.5030909@oracle.com> <4BD84C23.2000301@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Patrick McHardy , Netfilter Developer Mailing List , Linux Netdev List To: Jan Engelhardt Return-path: Received: from acsinet12.oracle.com ([141.146.126.234]:63761 "EHLO acsinet12.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753381Ab0D1Pue (ORCPT ); Wed, 28 Apr 2010 11:50:34 -0400 In-Reply-To: Sender: netfilter-devel-owner@vger.kernel.org List-ID: On 28/04/10 16:03, Jan Engelhardt wrote: > On Wednesday 2010-04-28 16:54, John Haxby wrote: > >> use-case I see -- the one I see is where the sys admins used to have a "crash >> trolley" which was a console and PS/2 keyboard which they could plug into a >> machine to get some information, but as many rack machines no longer have >> anything PS/2 and USB hot plug is unlikely to work on a sick machine >> > Oh I can tell you stories... sometimes it's so dead in the water that > the console unblanking would not work any more, rendering even any PS/2 > useless. Stupid southbridge chipsets blowing up DMA :-) > There's no hope in that case :-) Just take the machine out and give it a decent burial. On the other hand it's not uncommon to see reports that a machine has "hung totally" that include output from ping to show that it hasn't. Actually it's amazingly common to see this. And in just this situation xt_SYSRQ is still quite likely to work. jch