linux-kernel - Re: [BUG] perf: hard lockup when using perf-sched

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Message-ID: <4BA9A885.9050105@cn.fujitsu.com>
Date:	Wed, 24 Mar 2010 13:52:05 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [BUG] perf: hard lockup when using perf-sched

Anyone have a look at this bug ?

Li Zefan wrote:
> An idea came to me that running perf-sched with a fork "bomb" might
> reveal some bug.
> 
> So I wrote a program (attached), and did the following test:
> 
> # gcc fork.c
> # ./a.out &
> # perf sched record
> 
> After a few seconds, the machine froze, without printing any message.
> 
> I've tried the test both on v2.6.34-rc1 and v2.6.34-rc1-tip+.
> 
> I'll send you any other information you need.

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