linux-kernel - Re: [PATCH -tip v8 05/26] [BUGFIX] kprobes/x86: Prohibit probing on debug_stack

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Message-ID: <20140321205032.722a588e@gandalf.local.home>
Date:	Fri, 21 Mar 2014 20:50:32 -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>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Seiji Aguchi <seiji.aguchi@....com>,
	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>,
	Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH -tip v8 05/26] [BUGFIX] kprobes/x86: Prohibit probing on
 debug_stack_*

On Wed, 05 Mar 2014 20:59:18 +0900
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> Prohibit probing on debug_stack_reset and debug_stack_set_zero.
> Since the both functions are called from TRACE_IRQS_ON/OFF_DEBUG
> macros which run in int3 ist entry, probing it may cause a soft
> lockup.
> 
> This happens when the kernel built with CONFIG_DYNAMIC_FTRACE=y
> and CONFIG_TRACE_IRQFLAGS=y.
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

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