linux-kernel - Re: ftrace/perf

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Message-ID: <4C7E1F12.8030304@cn.fujitsu.com>
Date:	Wed, 01 Sep 2010 17:38:26 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	kvm-devel <kvm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: ftrace/perf_event leak

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);
 }
 
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