From mboxrd@z Thu Jan 1 00:00:00 1970 From: ebiederm@xmission.com (Eric W. Biederman) Date: Thu, 06 Aug 2009 03:51:58 +0000 Subject: Re: [Patch 0/7] Implement crashkernel=auto Message-Id: List-Id: References: <20090805112123.6552.73574.sendpatchset@localhost.localdomain> <20090805140408.GJ7259@hmsreliant.think-freely.org> <4A7A3A78.7080200@redhat.com> <4A7A506B.2060008@redhat.com> In-Reply-To: <4A7A506B.2060008@redhat.com> (Amerigo Wang's message of "Thu\, 06 Aug 2009 11\:39\:23 +0800") MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 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