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From: Li Zefan <lizf@cn.fujitsu.com>
To: Avi Kivity <avi@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@elte.hu>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	kvm-devel <kvm@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: ftrace/perf_event leak
Date: Wed, 01 Sep 2010 17:38:26 +0800	[thread overview]
Message-ID: <4C7E1F12.8030304@cn.fujitsu.com> (raw)
In-Reply-To: <4C7E1C36.6070400@redhat.com>

Avi Kivity wrote:
>  On 09/01/2010 12:04 PM, Peter Zijlstra wrote:
>>
>> Does something like the below cure that?
>>
> 
> Unfortunately not.
> 

Then try this:

The bug should be caused by commit 1c024eca51fdc965290acf342ae16a476c2189d0.

---
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 8a2b73f..9d1d1f2 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -161,6 +161,7 @@ void perf_trace_destroy(struct perf_event *p_event)
 		}
 	}
 out:
+	module_put(tp_event->mod);
 	mutex_unlock(&event_mutex);
 }
 

  parent reply	other threads:[~2010-09-01  9:33 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-01  8:42 ftrace/perf_event leak Avi Kivity
2010-09-01  9:04 ` Peter Zijlstra
2010-09-01  9:26   ` Avi Kivity
2010-09-01  9:35     ` Peter Zijlstra
2010-09-01  9:38     ` Li Zefan [this message]
2010-09-01  9:41       ` Peter Zijlstra
2010-09-01 10:38       ` Avi Kivity
2010-09-01 11:02         ` Peter Zijlstra
2010-09-01 11:07           ` Ingo Molnar
2010-09-01 12:15           ` Frederic Weisbecker
2010-09-01 13:59             ` Steven Rostedt
2010-09-01 17:32               ` Ingo Molnar
2010-09-02  1:20             ` Li Zefan
2010-09-09 19:45       ` [tip:perf/core] perf, trace: Fix module leak tip-bot for Li Zefan

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