linux-kernel - Re: [Patch 1/4][kernel][slimdump] Add new elf-note of type NT

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Message-ID: <m162k64c7w.fsf@fess.ebiederm.org>
Date:	Mon, 03 Oct 2011 03:10:43 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	prasad@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, crash-utility@...hat.com,
	kexec@...ts.infradead.org, Vivek Goyal <vgoyal@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	"Luck\, Tony" <tony.luck@...el.com>, anderson@...hat.com,
	tachibana@....nes.nec.co.jp, oomichi@....nes.nec.co.jp
Subject: Re: [Patch 1/4][kernel][slimdump] Add new elf-note of type NT_NOCOREDUMP to capture slimdump

"K.Prasad" <prasad@...ux.vnet.ibm.com> writes:

> There are certain types of crashes induced by faulty hardware in which
> capturing crashing kernel's memory (through kdump) makes no sense (or sometimes
> dangerous).
>
> A case in point, is unrecoverable memory errors (resulting in fatal machine
> check exceptions) in which reading from the faulty memory location from the
> kexec'ed kernel will cause double fault and system reset (leaving no
> information for the user).

It does make plenty of sense, and I capture the all of the time.
It totally doesn't make sense to do this in the kernel when we can
filter this from userspace just fine.

Nacked-by: "Eric W. Biederman" <ebiederm@...ssion.com>

I thought we already had this discussion.  Why is this silliness coming
back?

I especially dislike the notion of hardcoding policy in the kernel like this.

Eric
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