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Date:	Fri, 21 Mar 2014 17:44:00 -0400
From:	Steven Rostedt <>
To:	Masami Hiramatsu <>
Cc:, Ingo Molnar <>,
	Andi Kleen <>,
	Ananth N Mavinakayanahalli <>,
	Sandeepa Prabhu <>,
	Frederic Weisbecker <>,,,,,
	"H. Peter Anvin" <>,
	Thomas Gleixner <>
Subject: Re: [PATCH -tip v8 02/26] kprobes/x86: Allow to handle reentered
 kprobe on singlestepping

On Wed, 05 Mar 2014 20:58:57 +0900
Masami Hiramatsu <> wrote:

> Since the NMI handlers(e.g. perf) can interrupt in the
> single stepping (or preparing the single stepping, do_debug
> etc.), we should consider a kprobe is hit in the NMI
> handler. Even in that case, the kprobe is allowed to be
> reentered as same as the kprobes hit in kprobe handlers
> The real issue will happen when a kprobe hit while another
> reentered kprobe is processing (KPROBE_REENTER), because
> we already consumed a saved-area for the previous kprobe.
> Signed-off-by: Masami Hiramatsu <>
> Cc: Thomas Gleixner <>
> Cc: Ingo Molnar <>
> Cc: "H. Peter Anvin" <>

Reviewed-by: Steven Rostedt <>

-- Steve
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