linux-kernel - Re: perf: perf_fuzzer triggers instant reboot

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Date:	Wed, 01 Oct 2014 07:16:11 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Cong Wang <cwang@...pensource.com>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: perf_fuzzer triggers instant reboot

On 09/30/2014 01:23 PM, Peter Zijlstra wrote:
> How about this then?
> 
> ---
> Subject: perf: Fix unclone_ctx() vs locking
> 
> The idiot who did 4a1c0f262f88 forgot to pay attention and fix all
> similar cases. Do so now.
> 
> In particular, unclone_ctx() must be called while holding ctx->lock,
> therefore all such sites are broken for the same reason. Pull the
> put_ctx() call out from under ctx->lock.
> 
> Reported-by: Sasha Levin <sasha.levin@...cle.com>
> Fixes: 4a1c0f262f88 ("perf: Fix lockdep warning on process exit")
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Looks good! The issue didn't reproduce anymore.


Thanks,
Sasha
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