linux-kernel - Re: [PATCH -tip v8 02/26] kprobes/x86: Allow to handle reentered kprobe on singlestepping

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Message-ID: <20140321174400.581551a2@gandalf.local.home>
Date:	Fri, 21 Mar 2014 17:44:00 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	fche@...hat.com, mingo@...hat.com, systemtap@...rceware.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
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 <masami.hiramatsu.pt@...achi.com> 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
> (KPROBE_HIT_ACTIVE or KPROBE_HIT_SSDONE).
> 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 <masami.hiramatsu.pt@...achi.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>

Reviewed-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve
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