linux-kernel - Re: [PATCH -tip v2 2/3] [BUGFIX] kprobes/x86: Prohibit probing on debug_stack

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Message-ID: <20131101095654.37db1b24@gandalf.local.home>
Date:	Fri, 1 Nov 2013 09:56:54 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Fenghua Yu <fenghua.yu@...el.com>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	x86@...nel.org, lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH -tip v2 2/3] [BUGFIX] kprobes/x86: Prohibit probing on
 debug_stack_*

On Fri, 01 Nov 2013 11:25:34 +0000
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>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Fenghua Yu <fenghua.yu@...el.com>
> Cc: Seiji Aguchi <seiji.aguchi@....com>
> ---

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

-- Steve
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