linux-kernel - Re: [Patch 0/7] Implement crashkernel=auto

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Date:	Wed, 05 Aug 2009 20:51:58 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Amerigo Wang <amwang@...hat.com>
Cc:	Neil Horman <nhorman@...hat.com>, linux-kernel@...r.kernel.org,
	tony.luck@...el.com, linux-ia64@...r.kernel.org,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	Anton Vorontsov <avorontsov@...mvista.com>
Subject: Re: [Patch 0/7] Implement crashkernel=auto

Amerigo Wang <amwang@...hat.com> 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
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