From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754109AbZHFDwI (ORCPT ); Wed, 5 Aug 2009 23:52:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753900AbZHFDwH (ORCPT ); Wed, 5 Aug 2009 23:52:07 -0400 Received: from out01.mta.xmission.com ([166.70.13.231]:56818 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753770AbZHFDwG (ORCPT ); Wed, 5 Aug 2009 23:52:06 -0400 To: Amerigo Wang Cc: Neil Horman , linux-kernel@vger.kernel.org, tony.luck@intel.com, linux-ia64@vger.kernel.org, akpm@linux-foundation.org, Ingo Molnar , Anton Vorontsov References: <20090805112123.6552.73574.sendpatchset@localhost.localdomain> <20090805140408.GJ7259@hmsreliant.think-freely.org> <4A7A3A78.7080200@redhat.com> <4A7A506B.2060008@redhat.com> From: ebiederm@xmission.com (Eric W. Biederman) Date: Wed, 05 Aug 2009 20:51:58 -0700 In-Reply-To: <4A7A506B.2060008@redhat.com> (Amerigo Wang's message of "Thu\, 06 Aug 2009 11\:39\:23 +0800") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-XM-SPF: eid=;;;mid=;;;hst=in02.mta.xmission.com;;;ip=76.21.114.89;;;frm=ebiederm@xmission.com;;;spf=neutral X-SA-Exim-Connect-IP: 76.21.114.89 X-SA-Exim-Rcpt-To: amwang@redhat.com, avorontsov@ru.mvista.com, mingo@elte.hu, akpm@linux-foundation.org, linux-ia64@vger.kernel.org, tony.luck@intel.com, linux-kernel@vger.kernel.org, nhorman@redhat.com X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-DCC: XMission; sa02 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: ;Amerigo Wang X-Spam-Relay-Country: X-Spam-Report: * -1.8 ALL_TRUSTED Passed through trusted hosts only via SMTP * 1.5 XMNoVowels Alpha-numberic number with no vowels * 0.0 T_TM2_M_HEADER_IN_MSG BODY: T_TM2_M_HEADER_IN_MSG * -2.6 BAYES_00 BODY: Bayesian spam probability is 0 to 1% * [score: 0.0000] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa02 1397; Body=1 Fuz1=1 Fuz2=1] * 0.0 T_TooManySym_01 4+ unique symbols in subject * 0.0 XM_SPF_Neutral SPF-Neutral * 0.4 UNTRUSTED_Relay Comes from a non-trusted relay Subject: Re: [Patch 0/7] Implement crashkernel=auto X-SA-Exim-Version: 4.2.1 (built Thu, 25 Oct 2007 00:26:12 +0000) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Amerigo Wang writes: >> No the crashdump mechanism is useless because user space is already >> broken and unusable. > > Again, why broken? To get a stock stat drive by hand I had to list about 5 kernel modules in the right magic order in /etc/kdump.conf Neither mount by label or mount by uuid when specified in /etc/kdump.conf I had to hack mkdumprd to get an initrd that even finds the proper disk to mount. Short version it takes a huge amount of expertise to get what ships with fedora to pass the trivial alt-sysrq-c test. It would probably be about as easy to write you own custom initrd by hand. Eric