linux-kernel - Re: sw_perf_event_destroy() oops while fuzzing

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Date:	Fri, 12 Apr 2013 11:00:43 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Tommi Rantala <tt.rantala@...il.com>
Cc:	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: sw_perf_event_destroy() oops while fuzzing

On Fri, 2013-04-12 at 08:34 +0300, Tommi Rantala wrote:

> [92759.011005] RIP  [<ffffffff811a7200>] sw_perf_event_destroy+0x30/0x90

> [114607.070003] RIP: 0010:[<ffffffff811a7200>]  [<ffffffff811a7200>]
> sw_perf_event_destroy+0x30/0x90

> [114607.070003] RIP  [<ffffffff811a7200>] sw_perf_event_destroy+0x30/0x90

Would you have a source line for me that goes with that.. I can't seem
to poke any holes just by looking.

perf_swevent_init() only sets event->destroy() (to
sw_perf_event_destroy) _after_ it increments the static key thing and
enqueues (and allocates) the hash list stuff.

Obviously something is funny, but I'm not seeing it.

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