linux-kernel - Re: [PATCH 10/19] x86/dumpstack: add get_stack

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Message-ID: <20160726183107.2e7172c6@gandalf.local.home>
Date:	Tue, 26 Jul 2016 18:31:07 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Brian Gerst <brgerst@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Byungchul Park <byungchul.park@....com>
Subject: Re: [PATCH 10/19] x86/dumpstack: add get_stack_info() interface

On Tue, 26 Jul 2016 17:24:54 -0500
Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> > This should be impossible unless that last entry is MCE.  If we
> > actually fire an event that isn't MCE early in NMI entry, something
> > already went very wrong.  
> 
> So we don't need to support breakpoints in the early NMI entry code?

Yes, if that happens, then bad things can really happen.

The only way a breakpoint could be added there, is perhaps with KGDB,
and that's just asking for trouble anyway.

-- Steve