Re: [Patch 1/4][kernel][slimdump] Add new elf-note of typeNT_NOCOREDUMP to capture slimdump

From: Borislav Petkov
Date: Wed Oct 05 2011 - 08:31:11 EST

On Wed, Oct 05, 2011 at 07:55:46AM -0400, Valdis.Kletnieks@xxxxxx wrote:
> On Wed, 05 Oct 2011 09:31:11 +0200, Borislav Petkov said:
> > On Wed, Oct 05, 2011 at 12:37:28PM +0530, K.Prasad wrote:
> > > True. Like stated by me earlier, there could be two possible outcomes
> > > from capturing memory dump in such cases - they're either dangerous or
> > > doesn't make sense.
> >
> > Why, in the second example the only corruption is to the L2 cache so
> > your memory image is intact. Why wouldn't you want to capture a memory
> > dump then? It is business as usual in that case.
> I'll bite. What's the use case for bothering to capture a memory dump when
> you're looking at an MCE that indicates L2 cache corruption? What additional
> useful information could you possibly get from the dump?

This was just a hypothetical example to show that you need a more
finer-grained differentiation between fatal MCEs when deciding to dump
or not to dump :-) and not to unconditionally _not_ dump just because
we're going to panic.

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