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Date: Tue, 16 Dec 2008 22:55:34 +0100
From: "=?ISO-8859-1?Q?Fr=E9d=E9ric_Weisbecker?=" <fweisbec@gmail.com>
To: "Steven Rostedt" <rostedt@goodmis.org>
Subject: Re: [PATCH] tracing/ftrace: use preempt_enable_no_resched_notrace in ring_buffer_time_stamp()
Cc: "Ingo Molnar" <mingo@elte.hu>,
        "Linux Kernel" <linux-kernel@vger.kernel.org>
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2008/12/16 Steven Rostedt <rostedt@goodmis.org>:
>
>
> On Tue, 16 Dec 2008, Fr?d?ric Weisbecker wrote:
>>
>> The hard reboots I've seen are related to x86-64 while
>> disabling/reenabling a CPU through /sys/device/system/cpu
>> No tracer was enabled at these times (the problem still remains with
>> latest updates on -tip for half an hour).
>
> Do you have STACK_TRACER enabled?
>
> -- Steve
>

You were right. I've just built a kernel without STACK_TRACER and the
problem disappears...