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

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Date:	Mon, 29 Mar 2010 10:01:44 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Mike Galbraith <efault@....de>
CC:	LKML <linux-kernel@...r.kernel.org>, 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

> This seems to work, in contrast to everything I tried yesterday.  Not
> exactly a thing of beauty, but at least it's an option, so...
> 
> perf: fix perf sched record forkbomb deadlock
> 
> perf sched record can deadlock a box should the holder of handle->data->lock
> take an interrupt, and then attempt to acquire an rq lock held by a CPU trying
> to acquire the same lock.  Disable interrupts.
> 

This patch fixes the lockup on my box. Thanks!

> Signed-off-by: Mike Galbraith <efault@....de>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Reported-by: Li Zefan <lizf@...fujitsu.com>
> LKML-Reference: <new-submission>
> 
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