From: Ingo Molnar <mingo@elte.hu>
To: Michal Schmidt <mschmidt@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -rt] fix preempt count underflow in user_trace_stop
Date: Mon, 12 Mar 2007 17:46:00 +0100 [thread overview]
Message-ID: <20070312164600.GA25139@elte.hu> (raw)
In-Reply-To: <45F579D9.7090307@redhat.com>
* Michal Schmidt <mschmidt@redhat.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
prev parent reply other threads:[~2007-03-12 16:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-12 16:03 Michal Schmidt
2007-03-12 16:46 ` Ingo Molnar [this message]
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