linux-kernel - Re: [PATCH -rt] fix preempt count underflow in user_trace

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Message-ID: <20070312164600.GA25139@elte.hu>
Date:	Mon, 12 Mar 2007 17:46:00 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Michal Schmidt <mschmidt@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -rt] fix preempt count underflow in user_trace_stop


* Michal Schmidt <mschmidt@...hat.com> wrote:

> When playing with trace_user_trigger_irq in order to trace 
> IRQ->userspace latencies, I encountered a bug in the latency tracer. 
> If I have wakeup_timing enabled and attempt to stop the trace in my 
> userspace program, the system crashes. This is caused by an unbalanced 
> preempt_enable() which underflows the preempt count.

good catch! I've applied it,

	Ingo
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