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Date: Fri, 21 Mar 2014 20:50:32 -0400
From: Steven Rostedt <rostedt@goodmis.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
        Fenghua Yu <fenghua.yu@intel.com>, Seiji Aguchi <seiji.aguchi@hds.com>,
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        "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>,
        Borislav Petkov <bp@suse.de>
Subject: Re: [PATCH -tip v8 05/26] [BUGFIX] kprobes/x86: Prohibit probing on
 debug_stack_*
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On Wed, 05 Mar 2014 20:59:18 +0900
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.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@hitachi.com>

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